Restructuring Training True or False Questions

Thread Content

1. Low purity of the recycled benzene or the presence of water in it can cause the freezing point of the benzene product to be unsatisfactory. ? √ 2. When the solvent content in the feed to the clay tower remains high for an extended period, the activity of the clay also decreases. √ 3. The lower the relative volatility, the easier it is to separate aromatics from non-aromatics. ? ╳ 4. The higher the vapor pressure of a liquid, the less likely it is to vaporize. ?╳ 5、After steam purging of the white clay tower, if the white clay is to be removed, it must first be replaced with N2 to ensure proper conditions. ╳ 6. The smaller the relative volatility α of the two phases, the easier it is for them to separate. ? ╳ 7. The temperature difference control in the benzene tower is used to adjust the reflux flow rate of the tower by means of temperature differences. ?╳ 8. Adding too much lubricant to the pump can affect its normal operation. ? √ 9. The reduced selectivity of the solvent leads to a decrease in the purity of aromatic compounds; meanwhile, the decreased solubility reduces the recovery rate of these aromatic compounds. √ 10. Raising the temperature of this device facilitates the selectivity of the solvent. ? ╳ 11. When the liquid level at the bottom of Tower C-1002 rises rapidly and the bottom temperature drops, and increasing the steam supply manually yields no significant effect, it is possible to increase the vacuum level as well as the amount of steam used for stripping. √ 12. If the solvent content in the water cycle is high, the amount of water flowing from the water storage tank to the steam generator can be increased, as well as the amount of water flowing from the steam generator to the solvent regeneration tower, in order to reduce the solvent content in the water cycle. √13. Stable pressure in the extraction distillation column helps maintain stability at the interface at the bottom of the column; this interface level is linked in cascade with the feed rate to the solvent recovery column. ?√ 14. When the temperature at the top of the benzene column decreases, it is possible that the reflux benzene contains too much non-aromatic compounds and water; when the temperature at the top of the toluene column decreases, it is possible that the reflux contains benzene. ?√? 15. Increasing the solvent ratio in the extraction tower improves the purity of aromatics. ? ╳ 16. The pH value of the extraction system is controlled by adding monoethanolamine. ?√ 17. In the operation of the aromatic hydrocarbon extraction system, adding an antifoaming agent can prevent foaming. ? ╳ 18. An increase in the processing capacity of the distillation tower and an increase in the reflux ratio can cause overload of the downcomer. ? √ 19. The presence of olefins in benzene products affects the copper plate corrosion test for those benzene products. ? ╳ 20. The higher the vacuum level, the higher the absolute pressure. ? ╳ 21. The amount of solvent circulation in the extraction system can be determined by the level of the bottom interface in the extraction tower and the liquid level at the bottom of the solvent recovery tower. √?? 22. When the temperature at the top of the benzene tower increases, it is possible that the reflux benzene will contain too much non-aromatic compounds and water. ? ╳ 23. In a distillation column, the tray where the temperature differences and concentration differences are greatest is called the sensitive tray. ? √ 24. Increasing the temperature of the white clay tower appropriately enhances the adsorption capacity of the white clay, thereby reducing the content of alkenes in aromatic hydrocarbons. √ 25. The temperature difference and reflux rate in the benzene tower also affect the bottom temperature of the tower. ?√ 26. The presence of olefins in benzene products affects their bromine number and copper plate corrosion test results. ? ╳ 27. The higher the bottom temperature of the recovery tower, the higher the purity of the aromatics. ? ╳ 28. The higher the vacuum level in the recovery tower, the more favorable it is for the separation of aromatics from the solvent. ? ╳ 29. The amount of solvent circulation in the extraction distillation system affects the purity of aromatics. ? √ 30. The amount of solvent fed into the extraction distillation column affects the aromatic recovery rate. ? √ 31. The greater the vapor output from the top of the water stripping tower, the more favorable it is for operation. ? ╳ 32. When the content of non-aromatic compounds is high in the benzene reflux, the excess benzene should be removed promptly; otherwise, it will affect the purity and freezing point of the benzene product. √ 33. A low top temperature in the toluene column indicates that the benzene column is not functioning properly, allowing benzene to enter the toluene column. √ 34. The discharge pumps for the feed tank of the Bai Tu Tower are P-3005A/B. √ 35. The pH control of the extraction system is improved by adding monoethanolamine. ?√ 36. In the operation of the aromatic hydrocarbon extraction system, adding an antifoam agent can prevent foaming, and the more antifoam agent that is added, the better. ╳ 37. The failure in the copper phenol plate corrosion test may be due to the excessively low operating temperature of the clay tower, which should be increased appropriately. ╳ 38. Safety valves serve to release excess pressure and protect the equipment. ?√ 39. The difference in solubility of hydrocarbons of the same type but with different molecular weights in a solvent is referred to as classification selectivity. ?╳40. In the event of acute benzene poisoning, the patient should be quickly moved to a place with fresh air to ensure unobstructed breathing. √ 41. The pH value of the extraction distillation solvent system is controlled between 5.5 and 6.0 by adding monoethanolamine. √ 42. Rotameters are convenient for measuring flow rate, experience minimal energy loss, have a wide measurement range, and can be used to measure corrosive fluids. √ 43. Heat conduction can occur in solids, liquids, and gases. √ 44. Gauge pressure is equal to absolute pressure minus atmospheric pressure. √ 45. The basic modes of heat transfer are heat conduction and heat convection. × 46. The theoretical number of trays required is minimum when the distillation column is operated in full reflux. √ 47. The higher the temperature of an object, the stronger its radiative capacity. Answer: √ 48. A vacuum pump is a machine used in chemical processes to reduce the pressure in a system below atmospheric pressure. √ 49. A trap is a manually operated valve, also known as an air and water stop valve. × Correct answer: A trap is a self-acting valve, also known as an air and water drain valve or condensate extractor. 50. The static voltage is not very high, so it will not cause electric shock to people. ×