Seek gas purification training test questions

I. Fill-in-the-blank questions (2 points per blank, 30 points in total) 1. The main energy sources for crude benzene include ____, ____., ____., and ___. 2. The separation of oil and water in an oil-water separator relies primarily on the ______ of oil and water as well as their ______ to achieve separation; if the drainage mechanism of the oil-water separator does not function properly or becomes blocked, it will lead to ______________________. 3. An excessively high oil level in the oil-water separator, as well as an excessively high water level, can cause problems. 3. With all other operating conditions unchanged, reducing the tower pressure will lead to a decrease in product yield and quality. 4. The furnace temperature of a tubular furnace can be adjusted through _, _, _______. 5. The main task of this production process is . II. Selection (3 points per question, 15 points in total) 1. The methods for recovering crude benzene include ( ). A. Oil-washing absorption method B. Adsorption method C. Coagulation method 2. With all other operating conditions unchanged, increasing the steam input will result in an increase in output ( ). A. Increase B. Decrease C. Remain unchanged. 3. The recirculation pump should be turned on when the temperature in the benzene removal tower reaches ( )°. A、90 B、110 C、100 4. The use of copper tools for crude benzene is mainly based on ( ). A. Avoid the generation of chemical fire sources. B. Avoid the generation of physical fire sources. C. Avoid the generation of electrical fire sources. D. Avoid the generation of solar fire sources. 5. When the feed rate to the distillation tower increases, the output rate should ( ). A. Decrease B. Remain unchanged C. Increase III. Judge whether the statements are correct or incorrect, and correct the mistakes (3 points per question, 15 points in total) 1. When starting a centrifugal pump, open the outlet valve first; after it starts running, then open the inlet valve. ( ) 2. The heat transfer efficiency of spiral plate heat exchangers is 1–1.5 times that of tubular heat exchangers. （ ） 3. The lower the flash point of a substance, the less dangerous it is. ( ) 4. In the event of a small fire involving benzene, a foam fire extinguisher can be used to put it out. ( ) 5. With a constant number of distillation tower plates, increasing the number of plates in the rectification section can improve product quality. ( ) IV. Short-answer questions (8 points per question, 40 points in total) 1. Key points of crude benzene production operations 2. What factors determine the level of crude benzene production? 3. There is no benzene in the separation cylinder; what are the possible reasons for this phenomenon? 4. What are the procedures and operations for sending benzene? 5. What are the procedures to follow in case of sudden interruptions in water supply, power supply, or steam supply for crude benzene?

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Questions for the Desulfurization Wastewater Position 1. What is the production principle of the desulfurization process? Answer: (1) An alkaline solution absorbs H2S: NaCO3 + H2S === NaHCO3 + NaHS. (2) Sodium hydrosulfide reacts with sodium metavanadate to produce sodium pyrovanadate, with elemental sulfur being precipitated. 2NaCO3 + 4NaVO3 + H2O === Na2V4O9 + 4NaOH + 2S↓ At the same time, the quinone-form tannin absorbs H2S to form the phenol-form tannin. (3) The oxidized tannin oxidizes Na2V4O9 to NaVO3: Na2V4O9 + 2TQ + 2NaOH + H2O === 4NaVO3 + 2THQ. (4) The reduced tannin is oxidized: 2THQ + O2 === 2TQ + H2O2. (5) The NaHCO3 and NaOH produced as a result of these reactions react with each other: NaHCO3 + NaOH === NaCO3 + H2O. (6) The main side reactions are: 2NaHS + 2O2 === NaS2O3 + H2O. 2. Briefly describe the production process of the desulfurization process. Answer: Semi-water gas: The semi-water gas from work order 651 is washed in a scrubber tower, then passes through a water seal before desulfurization, before entering the bottom of the desulfurization tower. There it flows through the packing inside the tower and comes into counter-current contact with an alkaline tannin solution sprayed from the top of the tower; most of the H2S is absorbed by this solution. The desulfurized semi-water gas is then drawn out from the top of the tower and sent to the gas main inlet cabinet. Solution: The desulfurization pump draws the desulfurized lean liquid from the regeneration tank and pumps it to the top of the desulfurization tower where it is sprayed downward. There, it flows in opposite direction to the semi-water gas inside the tower; at the surface of the packing, gas and liquid phases come into contact. The desulfurized rich liquid accumulates at the bottom of the tower, passes through the U-shaped tube liquid seal, and then enters the buffer tank. The rich liquid from the buffer tank is pumped into the oxidation regeneration tank by a regeneration pump; within the ejector, the liquid is ejected at high speed, which draws in air automatically. The desulfurization process, involving the regeneration and separation of sulfur from the liquid, takes place in the ejector tube. The depleted liquid after desulfurization is pumped to the desulfurization tower for reuse. The sulfur foam in the floating sulfur layer at the upper part of the oxidation and regeneration tank overflows into the foam tank, where it is pumped by a foam pump to the high-level sulfur recovery tank for the processing and recovery of sulfur paste. 3. What are the methods for dealing with excessive H2S levels at the outlet of the desulfurization tower? Answer: a. Increase the solution circulation rate to an appropriate level. b. Appropriately supplement the base material with additional components. c. Adjust the solution temperature to normal. d. Strengthen sulfur recovery efforts to improve its efficiency. e. Adjust the gas-liquid ratio to enhance regeneration. f. Remove and recycle by-products. g. Increase the solution circulation rate; if necessary, stop the tower for treatment. h. Contact 651 for handling. 4. What are the reasons for the small size, high viscosity, and scarcity of sulfur foam particles, and what are the treatment methods? Answer: Reasons: a. The tannin is not prepared properly; there is an excessive amount of colloidal substances in the solution, or too much is added at once, resulting in poor regeneration and oxidation as well as poor sulfur precipitation. b. At high solution temperatures, sulfur precipitation occurs rapidly, the particles are small and the viscosity is high; at low solution temperatures, sulfur precipitation is slow and the amount of sulfur produced is low. c. The alkalinity of the solution is too low. Solution: a. Prepare tannin according to the specifications, increase the flow rate of the fresh solution, and use a method of adding small amounts multiple times to stabilize the components and enhance regeneration. b. Maintain the solution temperature within the process specifications to ensure normal sulfur precipitation. c. Adjust appropriately according to the situation. 5. Is there sudden leakage from the foam tank? Answer: Reason: The sulfur foam pump fails to operate properly or the overflow is too high. Solution: Clean the pump or replace it to maintain normal overflow levels. 6. Analyze the reasons for the too rapid increase or decrease in the desulfurization solution? Answer: a. The temperature of the gas entering the tower is high. b. The humidity of the recycled air is high. c. The system receives too little water replenishment. d. Poor gas-liquid separation. e. The gas load is too high. f、Severe loss due to fluid leakage or other reasons. g. The liquid level is too high when floating sulfur foam in the regeneration tank. 7. What are the methods to address too rapid increase or decrease in the desulfurization solution? Answer: a. Contact the dispatcher to inform 651 to handle it. b. Appropriately increase the temperature of the sulfur solution. c. The make-up water should be appropriate, or check the opening and closing status of the make-up water valve. d. Adjust the gas load and increase solution recovery. e. Contact the dispatch to adjust the load. f. Eliminate equipment defects and improve solution recovery. g. Attention should be paid to changes in liquid level, and it should be increased appropriately. 8. What should be done if high consumption of desulfurization raw materials is detected? Answer: a. Enhance the solution’s regeneration capacity to ensure oxidation efficiency and oxidation time; adjust the solution components to meet the specified standards in order to strictly control side reactions. b. Ensure the conditions for vanadium dissolution in order to improve the quality of the dissolved vanadium; when there is an excess of vanadium in the +4 state, increase the alkalinity accordingly to enhance oxidation and regeneration, ensure that vanadium exists in the +5 state in the solution, and raise the content of tannin to guarantee effective complexation. c. Increase the vacuum level of the vacuum filter, adjust the load, improve solution recovery, eliminate equipment defects, and enhance management. 9 What is the impact of temperature on desulfurization production? Answer: Higher temperatures result in faster reaction rates, but the solubility of gases decreases. If the temperature of the gas at the outlet of the scrubber is higher than that of the solution, the water vapor in the gas condenses into the solution, resulting in an increase in the liquid volume. This leads to a decrease in the composition of the solution, thereby affecting production. If the solution temperature is higher than that of the gas, the water in the solution evaporates, resulting in a decrease in the total amount of solution, but the impact is minimal. If the solution temperature is too high, it affects the active components in the solution, accelerates side reactions, and causes the sulfur produced through recovery to turn black. 10. What are the characteristics of spray regeneration? Answer: There is no need for a compressor to draw in air, nor is a high-head pump required to transport the fluid to the top of the regeneration tower; regeneration can take place within the tank itself. The equipment is simple to design and manufacture, which reduces costs and energy consumption. The air mixes evenly with the solution after injection, thereby facilitating the reaction and making sulfur flotation and solution regeneration easier. It reduces the regeneration time, requires less total solution volume compared to high-column regeneration, results in lower equipment temperatures, is easy to install and use, and has a simple operation process. 11. What is the role of air in the regeneration tank? Answer: Oxidized tannin, flotation sulfur foam. 12. Describe the wastewater treatment process. Answer: The wastewater coming from the gas furnace and scrubbers enters the horizontal sedimentation tank through channels, where most of the coal ash sludge and large suspended particles are removed. The wastewater then goes to the mixed mechanical reaction tank and subsequently to the inclined tube sedimentation tank, where more sludge and some suspended particles are removed. It then enters the hot water tank; the hot water is pumped by the hot water pump of System 1 to the cooling tower No. 1 for cooling, after which it flows into the cold water tank. The hot water from System 2 is pumped by its hot water pump and mixed with some of the water from System 1 before being sent to the cooling tower No. 2 for cooling, followed by entry into the collection tank and then into the collection tank of Cooling Tower No. 1, ultimately reaching the cold water tank. The cold water from Systems 1 and 2 gathers in this cold water tank, and it is pumped by the cold water pump of System 1 to the old gas production system for reuse in the compression and desulfurization units as well as in the electrostatic precipitator unit. The cold water from System 2 is also pumped by its cold water pump and used in the new gas production system. 13. Describe the sewage inspection route? Answer: Hot water tank --- Hot water pump and motor --- 1# cooling tower --- 2# cooling tower ---- Cold water tank ---- Cold water pump and motor. 14. Reasons why the water pump does not deliver sufficient flow rate and corresponding solutions. Answer: A. Air is remaining inside the pump and has not been removed ； Open the vent holes to release air. B. Excessive impeller wear or blocked inlet ； Stop the pump for maintenance. C. Motor reversal ； Contact an electrician to check it. D. Air leakage from the inlet pipe or gasket ； Check for leaks. E. Imported product is unopened or the liquid level is too low ； Open the inlet valve or adjust the liquid level. 15. The pump vibrates heavily and makes abnormal noises. Answer: A. Low water flow causing pressure buildup ； Adjust the small pump or regulate the water flow. B. There are debris in the impeller ； Reverse the standby pump to remove debris. C. Vortices are formed during water absorption, drawing in air ； Increase the submersion depth of the water suction tube. D. The corner bolts of the motor or water pump are loose ； Tighten the screw. E. Bearing wear causing rotational imbalance ； Replace the bearing. F. Excessive or insufficient lubricating oil ； Increase or decrease as appropriate.

Job title: Distillation worker; Level: Advanced. I. Fill in the blanks: (Enter the correct answer in the blanks provided; 0.5 points per blank) 1. The production of modified asphalt uses as raw material the ________ obtained from tar distillation. 2. For the pickling of crude benzene, the required sulfuric acid concentration is ______; the concentration of the regenerated acid is ______. 3. During tar distillation production, the water content in the tar before the plunger pump in Stage 1 is required to be ________. 4. During tar distillation, the temperature at the top of the fractionation tower should be controlled at _________. 5. The decomposition of phenates using coke oven flue gas relies on the principle that the flue gas contains _________ components, which react with the phenates. 6. The reflux stream at the top of the industrial naphthalene distillation tower is _________. 7. The main processes for refining crude benzene include hydrorefining and _________. 8. The benzene content in low-oil products shall not exceed _________. 9. The reflux ratio is the ratio of the reflux flow at the top of the tower to ___________. 10. The ash content requirement for industrial naphthalene products is less than ___________. 11. In the crude benzene section of the recycling workshop, the tubular furnace is used to provide _________ for distillation operations. 12. Material balance is the application of the ____________ law in production. 13. A distillation process that operates at atmospheric pressure is called ____________. 14. In the operation of a distillation tower, three types of equilibrium need to be understood: the first is __________, the second is vapor-liquid equilibrium, and the third is heat balance. 15. The three ways of heat transfer are first ________, second ________, and third ________. 16. During the pressure testing for equipment strength, for equipment with an operating pressure of 0.5 MPa or less, the test pressure is _____ of the operating pressure. 17. Under normal operating conditions, the actual reflux ratio is the ____________ of the minimum reflux ratio. 18. The function of the overflow weir is to ensure ____________. 19. For a typical distillation column, the tray at the feed inlet is usually called ______; the section of the column above the feed tray is called ______, while the section below the feed tray is called ______. 20. Electric meters use ______ as an energy source. 21. The basic components of chemical process measuring instruments can be roughly divided into: the sensing element, the transmission part, and _______. 22. The pressure that we measure using a pressure gauge is ______ pressure. 23. The oil content in the benzene blowing residue shall not exceed ______. 24. Generally speaking, the tower type with the greatest operational flexibility is ____________. 25. The moisture range in the tar quality specifications is ______. 26.0.05 MPa is equivalent to ______ industrial atmospheres. 27. Methylnaphthalene is mainly found in ______. 28. When cleaning pipes containing concentrated acid, ____________ should be used. 29. The washing oil is the fraction in coal tar that is ____________. 30. During the distillation of crude benzene, the temperature at the top of the regenerator should be controlled at ____________. 31. When the pipe diameter remains constant, as the flow rate increases, the resistance ______. 32. Globe valves should be installed on ____________. 33. Before starting the pump, check whether there are any problems with the motor and ____________. 34. The flow rate of a reciprocating pump depends only on the pump’s geometric dimensions and the number of reciprocations, and is independent of ______. 35. The most suitable reaction temperature for light benzene acid washing is ____________. 36. A solution with a pH of 1 appears ______. 37. In the purification process using light benzene acid washing, the main role of concentrated sulfuric acid is ____________. 38. The absorption capacity of similar liquid absorbents is ______ to their molecular weight. 39. The quality requirement for crude phenol is that the reaction should yield a ______ result. 40. At high coking temperatures, phenolic products ____________. 41. The dust content in blast furnace gas is required to be no higher than ____________. 42. The purpose of introducing superheated steam directly into the tower is, first, ____________, and second, ____________. 43. In a tubular furnace, the pale yellow color of the gas indicates that the amount of ______ is high while the amount of ______ is low; as a result, the heat generation is low. 44. The flame of gas combustion is divided into _________ three parts. 45. Polyester fiber, also known as “Dianlie,” is manufactured using phthalic anhydride as the main raw material, and the raw material for producing phthalic anhydride is ____________. 46. When the initial distillation tower for pure benzene is put into operation, it is required that the bottom mixture must meet the specified standards within ______ hours of the tower starting up. 47. Three methods of extinguishing fires: isolation method, cooling method, ____________. 48. Distillation columns can be classified by pressure into atmospheric columns, high-pressure columns, ____________. 49. The pumping volume of the first stage of a plunger pump is ____________ greater than that of the second stage. 50. Benzene can undergo sulfonation reaction with ____________. 51. The temperature of the raw gas entering the gas collection duct drops to 90°C because ____________. 52. The composition of waste gas tar is roughly ____________. 53. For mixtures in which the relative volatilities of the individual components differ significantly, _________ distillation should be used. 54. The benzene content in low-oil products is required to be no more than _________. II. Selection: (There is only one correct answer for each question. Fill in the serial number of the correct answer in the corresponding bracket. 1 point per question) 1. For products that exhibit sublimation ( ). A naphthalene. B. Resorcinol. C. Oil washing. 2. During the distillation of crude benzene, the temperature of the rich oil after the preheater should be controlled at ( ). A. >150°C. B.125--140℃. C.140--150℃. 3. The dry point of light benzene is ( ). A.>150℃. B.125--140℃. C.140--150℃. 4. The temperature at the top of the regenerator during crude benzene distillation should be controlled at ( ). A.140--150℃. B. 150–160°C. C.160--170℃. 5. Carbon disulfide is mainly found in ( ). A. Initial distillate. B. Mixed portion. C. Blow out benzene. 6. When the feed rate to the distillation tower increases, the yield should ( ). A decreases. B. Increase. C. Unchanged. 7. Acenaphthene is mainly found in ( ). A naphthalene oil fraction. B. Oil-washing fraction. C. Anthracene oil fraction. 8. Industrial naphthalene can be used to manufacture ( ) products. A. Phthalic anhydride. B. Fertilizers. C. Saccharin. 9. The basis on which material balance can be achieved is ( ). A. Heat balance. B. Law of conservation of mass. C. Vapor-liquid equilibrium. 10. The reflux ratio is ( ). A. Ratio of return flow to production volume. B. Ratio of feed rate to return flow rate. Ratio of C recovery to feed rate. 11. During the operation process, full reflux is usually used in ( ). A. During shutdown. B. Abnormal operation. C. Normal operation. 12. The oil content in the benzene blowing residue shall not exceed ( ). A.5%. B.1%. C.3%. 13. For mixtures whose components have similar volatilities, ( ) distillation should be used. A. Decompression. B. Atmospheric pressure. C. Extraction. 14. The quality requirement for industrial naphthalene is that the content of naphthalene must be no less than ( ). A.95%. B.98%. C.94%. 15. The operating conditions of a distillation tower mainly refer to ( ). A. Feed rate and recovery rate. B. Temperature and pressure. C. Return flow rate. 16. Tar is a ( ) mixture. A. Two rings. B. Four rings. C. Multiple rings. 17. The initial boiling point of heavy benzene in the two-benzene tower should be ( ). A.110--130℃. B.135--140℃. C.130--135℃. 18. The amount of distillate from fresh washed oil at 230°C shall not exceed ( ). A.10%. B.5%. C.3%. 19. The content of crude benzene in the composition of waste gas is approximately ( ) grams per cubic meter. A.28—35. B.50—55. C.20—25. 20. The required inlet water temperature for a primary cooler is generally ( ). A. 15℃. B. 20°C. C. 25°C. 21. The residence time of ammonia water in the mechanical clarifier is ( ). A. 20 minutes. B. 50 minutes. C. 50 minutes. 22. The temperature of the raw gas exiting the carbonization chamber is ( ). A. 700–750℃. B.550--650℃. C.650--700℃. 23. The temperature for tar dehydration is ( ). A. 70–80°C. B. 80–90°C. C.90--95℃. 24. When centrifugal pumps are connected in parallel, the head ( ). A. Unchanged. B. Increase. C. Decrease. 25. Centrifugal pumps are generally adjusted for flow rate using ( ). A. Outlet valve. B. Inlet valve. C. Check valve. 26. When pumps operate in parallel, ( ) increases. A. Head. B. Traffic. C. Efficiency. 27. The required content of phenol in neutral phenolate is ( ). A.10--20%. B.20--25%. C.30--35%. 28. In the unwashed mixed fraction of pure benzene, an increase in the CS2 content will cause acid tar ( ) to increase. A. Thinning out. B. Thicken. C. Quantity decreases. 29. Phenols can undergo ( ) reactions with bases. A. Polymerization. B. Neutralization. C. Permutation. 30. The component in coking wash oil that has strong absorption capacity is ( ). A. Methylnaphthalene. B. Naphthalene. C. Acenaphthene. 31. The pressure that we measure using a pressure gauge is ( ) pressure. A. Absolutely. B. Relative. C. Vacuum level. 32. Sodium phenolate is soluble in ( ). A. Tar. B. Benzene. C. Alkaline solution. 33. An increased CS2 content in the unwashed mixed fraction of pure benzene will cause acid tar ( ). A. Thinning out. B. Thicken. C. Quantity decreases. 34. The advantages of a packed tower are ( ). A. High operational flexibility. B. The operation is stable and reliable. C. The fluid flow resistance is low. 35. The tower pressure of the continuous benzene distillation column shall not exceed ( ) Mpa. A.0.025。 B.0.030。 C.0.035。 36. The pump that must be filled with a liquid medium inside it when started is ( ). A. Steam pump. B. Plunger pump. C. Vortex pump. 37. The tar level in the mechanized clarification tank should be kept below ( ). A.1600mm。 B.1200mm。 C.1800mm。 38. The circulating ammonia water volume ensures () cubic meters per ton of dry coal. A.5—6. B.4—7. C.2—3. 39. When starting a vortex pump, the outlet valve should ( ). A. Turn off. B. Fully open. C. Slightly open. 40. The ignition point of coke oven gas is ( ). A. 600–650℃. B.550--600℃. C. 500–550°C. III. Judgment: (Mark “√” for correct and “×” for incorrect; 1 point per question) 1. The required phenol content in crude phenol products is greater than 83%. ( ) 2. Tar plunger pumps are a type of centrifugal pump. ( ) 3. COD refers to biological oxygen demand ( ). 4. BOD is chemical oxygen demand ( ). 5. The purpose of tar desalination is to remove fixed ammonium salts. ( ) 6. Phenols are extracted from phenol oil, naphthalene oil, or washing oil. ( ) 7. The function of the reflux stream at the top of the distillation tower is merely to regulate the temperature at the top of the tower, not to affect the quality of the product. ( ) 8. Apart from having a higher softening point than medium-temperature asphalt, the other properties of modified asphalt are the same as those of medium-temperature asphalt. ( ) 9. The lean oil in the recycling workshop refers to a product that contains little oil and plenty of water. ( ) 10. The temperature of the oil used for benzene washing should be 2–4°C lower than that of the gas in summer. （ ） 11. The two-column plant produces pure benzene and toluene as its two products. ( ) 12. The purpose of the initial distillation of crude benzene is to remove the unsaturated compounds from the low-boiling fraction at temperatures below 79°C. ( ) 13. Tar does not contain acidic compounds. ( ) 14. During tar desalination, an 8–12% sodium carbonate solution is added in front of a piston pump. ( ) 15. Oil is used to remove benzene from gas, as it possesses absorption capabilities. ( ) 16. During tar distillation, the softening point of asphalt can be adjusted using superheated steam. ( ) 17. The task of the convection section in a tar tubular furnace is to remove the remaining water from the tar, resulting in an anhydrous tar with a water content of less than 0.5%. ( ) 18. Benzene-based products can be loaded onto vehicles and into barrels during thunderstorm weather. ( ) 19. When processing benzene, the heating rate of the heat transfer oil should be kept at 30°C per hour until 120°C is reached. ( ) 20. The initial boiling point of the mixture at the bottom of the refined benzene distillation column is 150°C. B.125--140℃. C.140--150℃. 6. The dry point of light benzene is ( ). A.>150℃. B.125--140℃. C.140--150℃. 7. The temperature at the top of the regenerator during crude benzene distillation should be controlled at ( ). A.140--150℃. B. 150–160°C. C.160--170℃. 8. Industrial naphthalene can be used to manufacture ( ) products. A. Phthalic anhydride. B. Fertilizers. C. Saccharin. 9. The basis on which material balance can be achieved is ( ). A. Heat balance. B. Law of conservation of mass. C. Vapor-liquid equilibrium. 10. The reflux ratio is ( ). A. Ratio of return flow to production volume. B. Ratio of feed rate to return flow rate. Ratio of C recovery to feed rate. 11. During the operation process, full reflux is usually used in ( ). A. During shutdown. B. Abnormal operation. C. Normal operation. 12. The oil content in the benzene blowing residue shall not exceed ( ). A.5%. B.1%. C.3%. 13. For mixtures whose components have similar volatilities, ( ) distillation should be used. A. Decompression. B. Atmospheric pressure. C. Extraction. 14. The quality requirement for industrial naphthalene is that the content of naphthalene must be no less than ( ). A.95%. B.98%. C.94%. 15. The operating conditions of a distillation tower mainly refer to ( ). A. Feed rate and recovery rate. B. Temperature and pressure. C. Return flow rate. 16. Tar is a ( ) mixture. A. Two rings. B. Four rings. C. Multiple rings. 17. The initial boiling point of heavy benzene in the two-benzene tower should be ( ). A.110--130℃. B.135--140℃. C.130--135℃. 18. The amount of distillate from fresh washed oil at 230°C shall not exceed ( ). A.10%. B.5%. C.3%. 19. The content of crude benzene in the composition of waste gas is approximately ( ) grams per cubic meter. A.28—35. B.50—55. C.20—25. 20. The required inlet water temperature for a primary cooler is generally ( ). A. 15℃. B. 20°C. C. 25°C. 21. The residence time of ammonia water in the mechanical clarifier is ( ). A. 20 minutes. B. 50 minutes. C. 50 minutes. 22. The temperature of the raw gas exiting the carbonization chamber is ( ). A. 700–750℃. B.550--650℃. C.650--700℃. 23. The temperature for tar dehydration is ( ). A. 70–80°C. B. 80–90°C. C.90--95℃. 24. When centrifugal pumps are connected in parallel, the head ( ). A. Unchanged. B. Increase. C. Decrease. 25. Centrifugal pumps are generally adjusted for flow rate using ( ). A. Outlet valve. B. Inlet valve. C. Check valve. 26. When pumps operate in parallel, ( ) increases. A. Head. B. Traffic. C. Efficiency. 27. The required content of phenol in neutral phenolate is ( ). A.10--20%. B.20--25%. C.30--35%. 28. In the unwashed mixed fraction of pure benzene, an increase in the CS2 content will cause acid tar ( ) to increase. A. Thinning out. B. Thicken. C. Quantity decreases. 29. Phenols can undergo ( ) reactions with bases. A. Polymerization. B. Neutralization. C. Permutation. 30. The component in coking wash oil that has strong absorption capacity is ( ). A. Methylnaphthalene. B. Naphthalene. C. Acenaphthene. 31. The pressure that we measure using a pressure gauge is ( ) pressure. A. Absolutely. B. Relative. C. Vacuum level. 32. Sodium phenolate is soluble in ( ). A. Tar. B. Benzene. C. Alkaline solution. 33. An increased CS2 content in the unwashed mixed fraction of pure benzene will cause acid tar ( ). A. Thinning out. B. Thicken. C. Quantity decreases. 34. The advantages of a packed tower are ( ). A. High operational flexibility. B. The operation is stable and reliable. C. The fluid flow resistance is low. 35. The tower pressure of the continuous benzene distillation column shall not exceed ( ) Mpa. A.0.025。 B.0.030。 C.0.035。 36. The pump that must be filled with a liquid medium inside it when started is ( ). A. Steam pump. B. Plunger pump. C. Vortex pump. 37. The tar level in the mechanized clarification tank should be kept below ( ). A.1600mm。 B.1200mm。 C.1800mm。 38. The circulating ammonia water volume ensures () cubic meters per ton of dry coal. A.5—6. B.4—7. C.2—3. 39. When starting a vortex pump, the outlet valve should ( ). A. Turn off. B. Fully open. C. Slightly open. 40. The ignition point of coke oven gas is ( ). A. 600–650℃. B.550--600℃. C. 500–550°C. III. Judgment: (Mark “√” for correct and “×” for incorrect; 1 point per question) 1. The function of the reflux liquid at the top of a distillation tower is merely to regulate the temperature at the top of the tower, not to adjust the quality of the product. ( ) 2. Apart from having a higher softening point than medium-temperature asphalt, the other properties of modified asphalt are the same as those of medium-temperature asphalt. ( ) 3. The lean oil from the recycling workshop is a product that contains little oil and a lot of water. （ ） 4. The temperature of the oil used for benzene washing should be 2--4°C lower than that of the gas in summer. （ ） 5. The two-column plant produces pure benzene and toluene as its two products. ( ) 6. The purpose of the initial distillation of crude benzene is to remove the unsaturated compounds from the low-boiling fraction at temperatures below 79°C. ( ) 7. Tar does not contain acidic compounds. ( ) 8. During tar desalination, an 8–12% sodium carbonate solution is added in front of a plunger pump. ( ) 9. Oil washing is used to remove benzene from gas, as oil washing agents possess absorption capabilities. ( ) 10. During tar distillation, the softening point of asphalt can be adjusted using superheated steam. ( ) 11. The task of the convection section in a tar tubular furnace is to remove the remaining water from the tar, resulting in an anhydrous tar with a water content of less than 0.5%. ( ) 12. Benzene-based products can be loaded onto vehicles and into barrels during thunderstorm weather. ( ) 13. When processing benzene, the heating rate of the heat transfer oil should be kept at 30°C per hour until 120°C is reached. ( ) 14. The crude phenol product is required to have a phenol content of over 83%. ( ) 15. Tar plunger pumps are a type of centrifugal pump. ( ) 16.COD refers to Biological Oxygen Demand. ( ) 17.BOD is chemical oxygen demand. ( ) 18. The purpose of tar desalting is to remove fixed ammonium salts. ( ) 19. Phenols are extracted from phenol oil, naphthalene oil, or washing oil. ( ) 20. The initial boiling point of the mixture at the bottom of the refined benzene distillation column is 150°C. B.125--140℃. C.140--150℃. 9. The dry point of light benzene is ( ). A.>150℃. B.125--140℃. C.140--150℃. 10. The temperature at the top of the regenerator during crude benzene distillation should be controlled at ( ). A.140--150℃. B. 150–160°C. C.160--170℃. 11. Carbon disulfide is mainly found in ( ). A. Initial distillate. B. Mixed portion. C. Blow out benzene. 12. When the feed rate to the distillation tower increases, the yield should ( ). A. Decrease. B. Increase. C. Unchanged. 13. Acenaphthene is mainly found in ( ). A. Naphthalene oil fraction. B. Oil-washing fraction. C. Anthracene oil fraction. 14. Industrial naphthalene can be used to manufacture ( ) products. A. Phthalic anhydride. B. Fertilizers. C. Saccharin. 15. The basis on which material balance can be achieved is ( ). A. Heat balance. B. Law of conservation of mass. C. Vapor-liquid equilibrium. 16. The reflux ratio is ( ). A. Ratio of return flow to production volume. B. Ratio of feed rate to return flow rate. Ratio of C recovery to feed rate. 17. During the operation process, full reflux is usually used in ( ). A. During shutdown. B. Abnormal operation. C. Normal operation. 18. The oil content in the benzene blowing residue shall not exceed ( ). A.5%. B.1%. C.3%. 19. For mixtures whose components have similar volatilities, ( ) distillation should be used. A. Decompression. B. Atmospheric pressure. C. Extraction. 20. The quality requirement for industrial naphthalene is that the content of naphthalene must be no less than ( ). A.95%. B.98%. C.94%. 21. The operating conditions of a distillation tower mainly refer to ( ). A. Feed rate and recovery rate. B. Temperature and pressure. C. Return flow rate. 22. Tar is a ( ) mixture. A. Two rings. B. Four rings. C. Multiple rings. 23. The initial boiling point of heavy benzene in the two-benzene tower should be ( ). A.110--130℃. B.135--140℃. C.130--135℃. 24. The amount of distillate from fresh washed oil at 230°C shall not exceed ( ). A.10%. B.5%. C.3%. 25. The content of crude benzene in the composition of waste gas is approximately ( ) grams per cubic meter. A.28—35. B.50—55. C.20—25. 26. The required inlet water temperature for a primary cooler is generally ( ). A. 15℃. B. 20°C. C. 25°C. 27. The residence time of ammonia water in the mechanical clarifier is ( ). A. 20 minutes. B. 50 minutes. C. 50 minutes. 28. The temperature of the raw gas exiting the carbonization chamber is ( ). A. 700–750℃. B.550--650℃. C.650--700℃. 29. The temperature for tar dehydration is ( ). A. 70–80°C. B. 80–90°C. C.90--95℃. 30. When centrifugal pumps are connected in parallel, the head ( ). A. Unchanged. B. Increase. C. Decrease. 31. Centrifugal pumps are generally adjusted for flow rate using ( ). A. Outlet valve. B. Inlet valve. C. Check valve. 32. When pumps operate in parallel, ( ) increases. A. Head. B. Traffic. C. Efficiency. 33. The required content of phenol in neutral phenate is ( ). A.10--20%. B.20--25%. C.30--35%. 34. In the unwashed mixed fraction of pure benzene, an increase in the CS2 content will cause acid tar ( ) to increase. A. Thinning out. B. Thicken. C. Quantity decreases. 35. Phenolic substances can undergo ( ) reactions with bases. A. Polymerization. B. Neutralization. C. Permutation. 36. The component in coking wash oil with strong absorption capacity is ( ). A. Methylnaphthalene. B. Naphthalene. C. Acenaphthene. 37. The pressure that we measure using a pressure gauge is ( ) pressure. A. Absolutely. B. Relative. C. Vacuum level. 38. Sodium phenolate is soluble in ( ). A. Tar. B. Benzene. C. Alkaline solution. 39. An increased CS2 content in the unwashed mixed fraction of pure benzene will cause acid tar ( ). A. Thinning out. B. Thicken. C. Quantity decreases. 40. The advantages of a packed tower are ( ). A. High operational flexibility. B. The operation is stable and reliable. C. The fluid flow resistance is low. 41. The pump that must be filled with a liquid medium inside it when started is ( ). A. Steam pump. B. Plunger pump. C. Vortex pump. 42. The tar level in the mechanized clarification tank should be kept below ( ). A.1600mm。 B.1200mm。 C.1800mm。 43. The circulating ammonia water volume ensures () cubic meters per ton of dry coal. A.5—6. B.4—7. C.2—3. 44. When starting a vortex pump, the outlet valve should ( ). A. Turn off. B. Fully open. C. Slightly open. 45. The ignition point of coke oven gas is ( ). A. 600–650℃. B.550--600℃. C. 500–550°C. III. Judgment: (Mark “√” for correct and “×” for incorrect; 1 point per question) 1. The required phenol content in crude phenol products is greater than 83%. ( ) 2. Tar plunger pumps are a type of centrifugal pump. ( ) 3. COD refers to Biological Oxygen Demand. ( ) 4. BOD is Chemical Oxygen Demand. ( ) 5. The purpose of tar desalination is to remove fixed ammonium salts. ( ) 6. Phenols are extracted from phenol oil, naphthalene oil, or washing oil. ( ) 7. The function of the reflux stream at the top of the distillation tower is merely to regulate the temperature at the tower top, not to affect the quality of the product. （ ） 8. Apart from having a higher softening point than medium-temperature asphalt, the other properties of modified asphalt are the same as those of medium-temperature asphalt. ( ) 9. The lean oil in the recycling workshop refers to a product that contains little oil and a lot of water. ( ) 10. The temperature of the oil used for benzene washing should be 2–4°C lower than that of the gas in summer. （ ） 11. The two-column plant produces pure benzene and toluene as its two products. ( ) 12. The purpose of the initial distillation of crude benzene is to remove the unsaturated compounds from the low-boiling fraction at temperatures below 79°C. ( ) 13. Tar does not contain acidic compounds. ( ) 14. During tar desalination, an 8–12% sodium carbonate solution is added in front of a piston pump. ( ) 15. Oil is used to remove benzene from gas, as it possesses absorption capabilities. ( ) 16. During tar distillation, the softening point of asphalt can be adjusted using superheated steam. ( ) 17. The task of the convection section in a tar tubular furnace is to remove the remaining water from the tar, resulting in an anhydrous tar with a water content of less than 0.5%. ( ) 18. Benzene-based products can be loaded onto vehicles and into barrels during thunderstorm weather. ( ) 19. When processing benzene, the heating rate of the heat transfer oil should be kept at 30°C per hour until 120°C is reached. ( ) 20. The initial boiling point of the mixture at the bottom of the refined benzene distillation column is 150°C. B.125--140℃. C.140--150℃. 9. The dry point of light benzene is ( ). A.>150℃. B.125--140℃. C.140--150℃. 10. The temperature at the top of the regenerator during crude benzene distillation should be controlled at ( ). A.140--150℃. B. 150–160°C. C.160--170℃. 11. Carbon disulfide is mainly found in ( ). A. Initial distillate. B. Mixed portion. C. Blow out benzene. 12. When the feed rate to the distillation tower increases, the yield should ( ). A. Decrease. B. Increase. C. Unchanged. 13. Acenaphthene is mainly found in ( ). A. Naphthalene oil fraction. B. Oil-washing fraction. C. Anthracene oil fraction. 14. Industrial naphthalene can be used to manufacture ( ) products. A. Phthalic anhydride. B. Fertilizers. C. Saccharin. 15. The basis on which material balance can be achieved is ( ). A. Heat balance. B. Law of conservation of mass. C. Vapor-liquid equilibrium. 16. The reflux ratio is ( ). A. Ratio of return flow to production volume. B. Ratio of feed rate to return flow rate. Ratio of C recovery to feed rate. 17. During the operation process, full reflux is usually used in ( ). A. During shutdown. B. Abnormal operation. C. Normal operation. 18. The oil content in the benzene blowing residue shall not exceed ( ). A.5%. B.1%. C.3%. 19. For mixtures whose components have similar volatilities, ( ) distillation should be used. A. Decompression. B. Atmospheric pressure. C. Extraction. 20. The quality requirement for industrial naphthalene is that the content of naphthalene must be no less than ( ). A.95%. B.98%. C.94%. 21. The operating conditions of a distillation tower mainly refer to ( ). A. Feed rate and recovery rate. B. Temperature and pressure. C. Return flow rate. 22. Tar is a ( ) mixture. A. Two rings. B. Four rings. C. Multiple rings. 23. The initial boiling point of heavy benzene in the two-benzene tower should be ( ). A.110--130℃. B.135--140℃. C.130--135℃. 24. The amount of distillate from fresh washed oil at 230°C shall not exceed ( ). A.10%. B.5%. C.3%. 25. The content of crude benzene in the composition of waste gas is approximately ( ) grams per cubic meter. A.28—35. B.50—55. C.20—25. 26. The required inlet water temperature for a primary cooler is generally ( ). A. 15℃. B. 20°C. C. 25°C. 27. The residence time of ammonia water in the mechanical clarifier is ( ). A. 20 minutes. B. 50 minutes. C. 50 minutes. 28. The temperature of the raw gas exiting the carbonization chamber is ( ). A. 700–750℃. B.550--650℃. C.650--700℃. 29. The temperature for tar dehydration is ( ). A. 70–80°C. B. 80–90°C. C.90--95℃. 30. When centrifugal pumps are connected in parallel, the head ( ). A. Unchanged. B. Increase. C. Decrease. 31. Centrifugal pumps are generally adjusted for flow rate using ( ). A. Outlet valve. B. Inlet valve. C. Check valve. 32. When pumps operate in parallel, ( ) increases. A. Head. B. Traffic. C. Efficiency. 33. The required content of phenol in neutral phenate is ( ). A.10--20%. B.20--25%. C.30--35%. 34. In the unwashed mixed fraction of pure benzene, an increase in the CS2 content will cause acid tar ( ) to increase. A. Thinning out. B. Thicken. C. Quantity decreases. 35. Phenols can undergo ( ) reactions with bases. A. Polymerization. B. Neutralization. C. Permutation. 36. The component in coking wash oil with strong absorption capacity is ( ). A. Methylnaphthalene. B. Naphthalene. C. Acenaphthene. 37. The pressure that we measure using a pressure gauge is ( ) pressure. A. Absolutely. B. Relative. C. Vacuum level. 38. Sodium phenolate is soluble in ( ). A. Tar. B. Benzene. C. Alkaline solution. 39. An increased CS2 content in the unwashed mixed fraction of pure benzene will cause acid tar ( ). A. Thinning out. B. Thicken. C. Quantity decreases. 40. The advantages of a packed tower are ( ). A. High operational flexibility. B. The operation is stable and reliable. C. The fluid flow resistance is low. 41. The pump that must be filled with a liquid medium inside it when started is ( ). A. Steam pump. B. Plunger pump. C. Vortex pump. 42. The tar level in the mechanized clarification tank should be kept below ( ). A.1600mm。 B.1200mm。 C.1800mm。 43. The circulating ammonia water volume ensures () cubic meters per ton of dry coal. A.5—6. B.4—7. C.2—3. 44. When starting a vortex pump, the outlet valve should ( ). A. Turn off. B. Fully open. C. Slightly open. 45. The ignition point of coke oven gas is ( ). A. 600–650℃. B.550--600℃. C. 500–550°C. III. Judgment: (Mark “√” for correct and “×” for incorrect; 1 point per question) 1. The required phenol content in crude phenol products is greater than 83%. ( ) 2. Tar plunger pumps are a type of centrifugal pump. ( ) 3.COD refers to Biological Oxygen Demand. ( ) 4. BOD is biochemical oxygen demand. ( ) 5. The purpose of tar desalination is to remove fixed ammonium salts. ( ) 6. Phenols are extracted from phenol oil, naphthalene oil, or washing oil. ( ) 7. The function of the reflux stream at the top of the distillation tower is merely to regulate the temperature at the tower top, not to affect the quality of the product. （ ） 8. Apart from having a higher softening point than medium-temperature asphalt, the other properties of modified asphalt are the same as those of medium-temperature asphalt. ( ) 9. The lean oil in the recycling workshop refers to a product that contains little oil and a lot of water. ( ) 10. The temperature of the oil used for benzene washing should be 2–4°C lower than that of the gas in summer. （ ） 11. The two-column plant produces pure benzene and toluene as its two products. ( ) 12. The purpose of the initial distillation of crude benzene is to remove the unsaturated compounds from the low-boiling fraction at temperatures below 79°C. ( ) 13. Tar does not contain acidic compounds. ( ) 14. During tar desalination, an 8–12% sodium carbonate solution is added in front of a piston pump. ( ) 15. Oil is used to remove benzene from gas, as it possesses absorption capabilities. ( ) 16. During tar distillation, the softening point of asphalt can be adjusted using superheated steam. ( ) 17. The task of the convection section in a tar tubular furnace is to remove the remaining water from the tar, resulting in an anhydrous tar with a water content of less than 0.5%. ( ) 18. Benzene-based products can be loaded onto vehicles and into barrels during thunderstorm weather. ( ) 19. When processing benzene, the heating rate of the heat transfer oil should be kept at 30°C per hour until 120°C is reached. ( ) 20. The initial boiling point of the mixture at the bottom of the refined benzene distillation column is 150°C. B.125--140℃. C.140--150℃. 3. The dry point of light benzene is ( ). A.>150℃. B.125--140℃. C.140--150℃. 4. The temperature at the top of the regenerator during crude benzene distillation should be controlled at ( ). A.140--150℃. B. 150–160°C. C.160--170℃. 5. Carbon disulfide is mainly found in ( ). A. Initial distillate. B. Mixed portion. C. Blow out benzene. 6. When the feed rate to the distillation tower increases, the yield should ( ). A. Decrease. B. Increase. C. Unchanged. 7. Acenaphthene is mainly found in ( ). A. Naphthalene oil fraction. B. Oil-washing fraction. C. Anthracene oil fraction. 8. Industrial naphthalene can be used to manufacture ( ) products. A. Phthalic anhydride. B. Fertilizers. C. Saccharin. 9. The basis on which material balance can be achieved is ( ). A. Heat balance. B. Law of conservation of mass. C. Vapor-liquid equilibrium. 10. The reflux ratio is ( ). A. Ratio of return flow to production volume. B. Ratio of feed rate to return flow rate. Ratio of C recovery to feed rate. 11. During the operation process, full reflux is usually used in ( ). A. During shutdown. B. Abnormal operation. C. Normal operation. 12. The oil content in the benzene blowing residue shall not exceed ( ). A.5%. B.1%. C.3%. 13. For mixtures whose components have similar volatilities, ( ) distillation should be used. A. Decompression. B. Atmospheric pressure. C. Extraction. 14. The quality requirement for industrial naphthalene is that the content of naphthalene must be no less than ( ). A.95%. B.98%. C.94%. 15. The operating conditions of a distillation tower mainly refer to ( ). A. Feed rate and recovery rate. B. Temperature and pressure. C. Return flow rate. 16. Tar is a ( ) mixture. A. Two rings. B. Four rings. C. Multiple rings. 17. The initial boiling point of heavy benzene in the two-benzene tower should be ( ). A.110--130℃. B.135--140℃. C.130--135℃. 18. The amount of distillate from fresh washed oil at 230°C shall not exceed ( ). A.10%. B.5%. C.3%. 19. The content of crude benzene in the composition of waste gas is approximately ( ) grams per cubic meter. A.28—35. B.50—55. C.20—25. 20. The required inlet water temperature for a primary cooler is generally ( ). A. 15℃. B. 20°C. C. 25°C. 21. The residence time of ammonia water in the mechanical clarifier is ( ). A. 20 minutes. B. 50 minutes. C. 50 minutes. 22. The temperature of the raw gas exiting the carbonization chamber is ( ). A. 700–750℃. B.550--650℃. C.650--700℃. 23. The temperature for tar dehydration is ( ). A. 70–80°C. B. 80–90°C. C.90--95℃. 24. When centrifugal pumps are connected in parallel, the head ( ). A. Unchanged. B. Increase. C. Decrease. 25. Centrifugal pumps are generally adjusted for flow rate using ( ). A. Outlet valve. B. Inlet valve. C. Check valve. 26. When pumps operate in parallel, ( ) increases. A. Head. B. Traffic. C. Efficiency. 27. The required content of phenol in neutral phenolate is ( ). A.10--20%. B.20--25%. C.30--35%. 28. In the unwashed mixed fraction of pure benzene, an increase in the CS2 content will cause acid tar ( ) to increase. A. Thinning out. B. Thicken. C. Quantity decreases. 29. Phenols can undergo ( ) reactions with bases. A. Polymerization. B. Neutralization. C. Permutation. 30. The component in coking wash oil that has strong absorption capacity is ( ). A. Methylnaphthalene. B. Naphthalene. C. Acenaphthene. 31. The pressure that we measure using a pressure gauge is ( ) pressure. A. Absolutely. B. Relative. C. Vacuum level. 32. Sodium phenolate is soluble in ( ). A. Tar. B. Benzene. C. Alkaline solution. 33. An increased CS2 content in the unwashed mixed fraction of pure benzene will cause acid tar ( ). A. Thinning out. B. Thicken. C. Quantity decreases. 34. The advantages of a packed tower are ( ). A. High operational flexibility. B. The operation is stable and reliable. C. The fluid flow resistance is low. 35. The tower pressure of the continuous benzene distillation column shall not exceed ( ) Mpa. A.0.025。 B.0.030。 C.0.035。 36. The pump that must be filled with a liquid medium inside it when started is ( ). A. Steam pump. B. Plunger pump. C. Vortex pump. 37. The tar level in the mechanized clarification tank should be kept below ( ). A.1600mm。 B.1200mm。 C.1800mm。 38. The circulating ammonia water volume ensures () cubic meters per ton of dry coal. A.5—6. B.4—7. C.2—3. 39. When starting a vortex pump, the outlet valve should ( ). A. Turn off. B. Fully open. C. Slightly open. 40. The ignition point of coke oven gas is ( ). A. 600–650℃. B.550--600℃. C. 500–550°C. III. Judgment: (Mark “√” for correct and “×” for incorrect; 1 point per question) 1. The required phenol content in crude phenol products is greater than 83%. ( ) 2. Tar plunger pumps are a type of centrifugal pump. ( ) 3.COD refers to Biological Oxygen Demand. ( ) 4. BOD is biochemical oxygen demand. ( ) 5. The purpose of tar desalination is to remove fixed ammonium salts. ( ) 6. Phenols are extracted from phenol oil, naphthalene oil, or washing oil. ( ) 7. The function of the reflux stream at the top of the distillation tower is merely to regulate the temperature at the tower top, not to affect the quality of the product. （ ） 8. Apart from having a higher softening point than medium-temperature asphalt, the other properties of modified asphalt are the same as those of medium-temperature asphalt. ( ) 9. The lean oil in the recycling workshop refers to a product that contains little oil and a lot of water. ( ) 10. The temperature of the oil used for benzene washing should be 2–4°C lower than that of the gas in summer. （ ） 11. The two-column plant produces pure benzene and toluene as its two products. ( ) 12. The purpose of the initial distillation of crude benzene is to remove the unsaturated compounds from the low-boiling fraction at temperatures below 79°C. ( ) 13. Tar does not contain acidic compounds. ( ) 14. During tar desalination, an 8–12% sodium carbonate solution is added in front of a piston pump. ( ) 15. Oil is used to remove benzene from gas, as it possesses absorption capabilities. ( ) 16. During tar distillation, the softening point of asphalt can be adjusted using superheated steam. ( ) 17. The function of the convection section in a tar tubular furnace is to carry out the final dehydration of the tar, resulting in an anhydrous tar with a water content of less than 0.5%. ( ) 18. Benzene-based products can be loaded onto vehicles and into barrels during thunderstorms. ( ) 19. When processing benzene, the heating rate of the heat transfer oil should be kept at 30°C per hour until 120°C is reached. ( ) 20. The initial boiling point of the mixture at the bottom of the refined benzene distillation column is 150°C. B.125--140℃. C.140--150℃. 3. The dry point of light benzene is ( ). A.>150℃. B.125--140℃. C.140--150℃. 4. The temperature at the top of the regenerator during crude benzene distillation should be controlled at ( ). A.140--150℃. B. 150–160°C. C.160--170℃. 5. Carbon disulfide is mainly found in ( ). A. Initial distillate. B. Mixed portion. C. Blow out benzene. 6. When the feed rate to the distillation tower increases, the yield should ( ). A. Decrease. B. Increase. C. Unchanged. 7. Acenaphthene is mainly found in ( ). A. Naphthalene oil fraction. B. Oil-washing fraction. C. Anthracene oil fraction. 8. Industrial naphthalene can be used to manufacture ( ) products. A. Phthalic anhydride. B. Fertilizers. C. Saccharin. 9. The basis on which material balance can be achieved is ( ). A. Heat balance. B. Law of conservation of mass. C. Vapor-liquid equilibrium. 10. The reflux ratio is ( ). A. Ratio of return flow to production volume. B. Ratio of feed rate to return flow rate. Ratio of C recovery to feed rate. 11. During the operation process, full reflux is usually used in ( ). A. During shutdown. B. Abnormal operation. C. Normal operation. 12. The oil content in the benzene blowing residue shall not exceed ( ). A.5%. B.1%. C.3%. 13. For mixtures whose components have similar volatilities, ( ) distillation should be used. A. Decompression. B. Atmospheric pressure. C. Extraction. 14. The quality requirement for industrial naphthalene is that the content of naphthalene must be no less than ( ). A.95%. B.98%. C.94%. 15. The operating conditions of a distillation tower mainly refer to ( ). A. Feed rate and recovery rate. B. Temperature and pressure. C. Return flow rate. 16. Tar is a ( ) mixture. A. Two rings. B. Four rings. C. Multiple rings. 17. The initial boiling point of heavy benzene in the two-benzene tower should be ( ). A.110--130℃. B.135--140℃. C.130--135℃. 18. The amount of distillate from fresh washed oil at 230°C shall not exceed ( ). A.10%. B.5%. C.3%. 19. The content of crude benzene in the composition of waste gas is approximately ( ) grams per cubic meter. A.28—35. B.50—55. C.20—25. 20. The required inlet water temperature for a primary cooler is generally ( ). A. 15℃. B. 20°C. C. 25°C. 21. The residence time of ammonia water in the mechanical clarifier is ( ). A. 20 minutes. B. 50 minutes. C. 50 minutes. 22. The temperature of the raw gas exiting the carbonization chamber is ( ). A. 700–750℃. B.550--650℃. C.650--700℃. 23. The temperature for tar dehydration is ( ). A. 70–80°C. B. 80–90°C. C.90--95℃. 24. When centrifugal pumps are connected in parallel, the head ( ). A. Unchanged. B. Increase. C. Decrease. 25. Centrifugal pumps are generally adjusted for flow rate using ( ). A. Outlet valve. B. Inlet valve. C. Check valve. 26. When pumps operate in parallel, ( ) increases. A. Head. B. Traffic. C. Efficiency. 27. The required content of phenol in neutral phenolate is ( ). A.10--20%. B.20--25%. C.30--35%. 28. In the unwashed mixed fraction of pure benzene, an increase in the CS2 content will cause acid tar ( ) to increase. A. Thinning out. B. Thicken. C. Quantity decreases. 29. Phenols can undergo ( ) reactions with bases. A. Polymerization. B. Neutralization. C. Permutation. 30. The component in coking wash oil that has strong absorption capacity is ( ). A. Methylnaphthalene. B. Naphthalene. C. Acenaphthene. 31. The pressure that we measure using a pressure gauge is ( ) pressure. A. Absolutely. B. Relative. C. Vacuum level. 32. Sodium phenolate is soluble in ( ). A. Tar. B. Benzene. C. Alkaline solution. 33. An increased CS2 content in the unwashed mixed fraction of pure benzene will cause acid tar ( ). A. Thinning out. B. Thicken. C. Quantity decreases. 34. The advantages of a packed tower are ( ). A. High operational flexibility. B. The operation is stable and reliable. C. The fluid flow resistance is low. 35. The tower pressure of the continuous benzene distillation column shall not exceed ( ) Mpa. A.0.025。 B.0.030。 C.0.035。 36. The pump that must be filled with a liquid medium inside it when started is ( ). A. Steam pump. B. Plunger pump. C. Vortex pump. 37. The tar level in the mechanized clarification tank should be kept below ( ). A.1600mm。 B.1200mm。 C.1800mm。 38. The circulating ammonia water volume ensures () cubic meters per ton of dry coal. A.5—6. B.4—7. C.2—3. 39. When starting a vortex pump, the outlet valve should ( ). A. Turn off. B. Fully open. C. Slightly open. 40. The ignition point of coke oven gas is ( ). A. 600–650℃. B.550--600℃. C. 500–550°C. III. Judgment: (Mark “√” for correct and “×” for incorrect; 1 point per question) 1. The required phenol content in crude phenol products is greater than 83%. ( ) 2. Tar plunger pumps are a type of centrifugal pump. ( ) 3.COD refers to Biological Oxygen Demand. ( ) 4. BOD is biochemical oxygen demand. ( ) 5. The purpose of tar desalination is to remove fixed ammonium salts. ( ) 6. Phenols are extracted from phenol oil, naphthalene oil, or washing oil. ( ) 7. The function of the reflux stream at the top of the distillation tower is merely to regulate the temperature at the tower top, not to affect the quality of the product. （ ） 8. Apart from having a higher softening point than medium-temperature asphalt, the other properties of modified asphalt are the same as those of medium-temperature asphalt. ( ) 9. The lean oil in the recycling workshop refers to a product that contains little oil and a lot of water. ( ) 10. The temperature of the oil used for benzene washing should be 2–4°C lower than that of the gas in summer. （ ） 11. The two-column plant produces pure benzene and toluene as its two products. ( ) 12. The purpose of the initial distillation of crude benzene is to remove the unsaturated compounds from the low-boiling fraction at temperatures below 79°C. ( ) 13. Tar does not contain acidic compounds. ( ) 14. During tar desalination, an 8–12% sodium carbonate solution is added in front of a piston pump. ( ) 15. Oil is used to remove benzene from gas, as it possesses absorption capabilities. ( ) 16. During tar distillation, the softening point of asphalt can be adjusted using superheated steam. ( ) 17. The task of the convection zone in a tar tubular furnace is to remove the remaining water from the tar, resulting in an anhydrous tar with a water content of less than 0.5%. ( ) 18. Benzene products can be loaded onto vehicles and into barrels during thunderstorms. ( ) 19. When processing benzene, the heating rate of the heat transfer oil should be kept at 30°C per hour until 120°C is reached. （ ） 20. Initial boiling point of the mixture at the bottom of the refined benzene primary distillation column

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