[Urea Knowledge] Daily Question (100) 2010.04.10
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This post was last edited by Xinjiu on 2010-4-9 at 19:30. Congratulations to those who participate in the Daily Urea Knowledge Quiz; 100 issues completed: victory:. Also, thanks to all those who support us: handshake. Hide the answers; no scoring will be given in principle if they are not hidden. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Fill-in-the-blank questions: 1. The stripping tower in the Snam ammonia stripping process uses ( ), allowing operation at temperatures higher than ( ), which improves the decomposition efficiency in the high-pressure circuit. 2. In the synthesis loop, an ejector powered by ( ) is used to circulate the ammonium methoxide solution. 3. The natural packing angle of granular urea is ( ), and its packing density varies with ( ) and ( ). 4. The common method used in industry to separate unreacted ammonia and carbon dioxide is: ( ). 5. During the heating process of urea aqueous solution, there are two unfavorable side reactions, which are ( ). Answer to the reply: 1. The stripping tower in the Snam ammonia stripping process uses titanium materials, allowing operation at temperatures above 200°C, which improves the decomposition efficiency in the high-pressure circuit. 2. In the synthesis circuit, an ejector powered by liquid ammonia as a reactant is used to circulate the ammonium methoxide solution. 3. The natural packing angle of granular urea is 37°, and its packing density varies depending on the particle size distribution and humidity. 4. The common separation methods used in industry to separate unreacted ammonia and carbon dioxide are: reduced pressure, increased temperature, and stripping. 5. During the heating of urea aqueous solution, there are two unfavorable side reactions: NH2CO2NH2 + H2O = 2NH3 + CO2, and 2NH2CONH2 = NH2COHNCONH2 + NH3.
2. Liquid ammonia； 4. Heating and stripping ； 5、2(NH2)2CO ==== NH2CONHCONH2 + NH3 ； (NH2)2CO + H2O ==== NH4COONH2
1. The stripping tower in the Snam ammonia stripping process is made of titanium, allowing operation at temperatures above 200°C, which improves the decomposition efficiency in the high-pressure circuit. 2. In the synthesis loop, a ejector powered by (liquid ammonia) is used to circulate the ammonium methoxide solution. 3. The natural packing angle of granular urea is (24), and the packing density varies depending on (particle size) and (packing method). 4. The common method used in industry to separate unreacted ammonia and carbon dioxide is: (multi-stage reduced-pressure heating). 5. During the heating of urea aqueous solution, there are two adverse side reactions: hydrolysis and formation of biuret.
1. Titanium material, 200 degrees 2. Raw material: liquid ammonia 3. 37 degrees, particle size distribution, humidity 4. Pressure reduction, heating, distillation 5. NH2CONH2+H2O--2NH3+CO2 2NH2CONH2--NH2CONHCONH2+NH3
1. Study partners 2. Ammonia 3. Particle size, concentration 4. Stripping, desorption 5. Hydrolysis, condensation. Not sure if it’s correct; the important thing is to participate
1. The stripping tower in the Snam ammonia stripping process is made of titanium, allowing operation at temperatures above 200°C and thereby improving the decomposition efficiency in the high-pressure circuit. 2. In the synthesis loop, a ejector powered by (liquid ammonia as raw material) is used to circulate the ammonium methoxide solution. 3. The natural packing angle of granular urea is (37°), and the packing density varies depending on the (particle size distribution) and (humidity). 4. The common separation methods used in industry to separate unreacted ammonia and carbon dioxide are: (depression, heating, stripping). 5. During the heating process of urea aqueous solution, there are two unfavorable side reactions: (NH2CONH2 + H2O = 2NH3 + CO2, 2NH2CONH2 = NH2CONHCONH2 + NH3).
1. The stripping tower in the Snam ammonia stripping process is made of titanium, allowing operation at temperatures above 200°C and thereby improving the decomposition efficiency in the high-pressure circuit. 2. In the synthesis circuit, a ejector powered by (liquid ammonia as raw material) is used to circulate the ammonium methoxide solution. 3. The natural packing angle of granular urea is (37°), and the packing density varies depending on (particle size distribution) and (humidity). 4. The common separation methods used in industry to separate unreacted ammonia and carbon dioxide are: (depression, heating, stripping). 5. During the heating of urea aqueous solution, there are two unfavorable side reactions: NH2CONH2 + H2O = 2NH3 + CO2, and 2NH2CONH2 = NH2CONHCONH2 + NH3
1. Titanium material, 200 degrees 2. Raw material: liquid ammonia 3. 37 degrees, particle size distribution, humidity 4. Reduced pressure, temperature increase, stripping 5. NH2CONH2+H2O=2NH3+CO2, 2NH2CONH2=NH2CONHCONH2+NH3
1. Titanium material, 200 degrees 2. Raw material: liquid ammonia 3. 37 degrees, particle size distribution, humidity 4. Pressure reduction, heating, distillation 5. NH2CONH2+H2O--2NH3+CO2 2NH2CONH2--NH2CONHCONH2+NH3
1. The stripping tower in the Snam ammonia stripping process uses packing, allowing operation at pressures higher than the tower pressure, thereby improving the decomposition efficiency in the high-pressure circuit. 2. In the synthesis circuit, an ejector powered by (steam) is used to circulate the ammonium methoxide solution. 3. The natural packing angle of granular urea is (30), and the packing density varies depending on (particle size) and (water content). 4. The common separation method used in industry to separate unreacted ammonia and carbon dioxide is: (centrifugal separation). 5. During the heating process of urea aqueous solution, there are two unfavorable side reactions, which are ( ).
1. Titanium material, 200 degrees 2. Raw material: liquid ammonia 3. 37 degrees, particle size distribution, humidity 4. Reduced pressure, temperature increase, stripping 5. NH2CONH2+H2O=2NH3+CO2, 2NH2CONH2=NH2CONHCONH2+NH3 1# Heart juice