As the ammonia-to-carbon ratio increases, why do both the liquid temperature at the high-pressure methamine condenser and the gas phase temperature in the synthesis tower decrease?

Liquid ammonia is originally a refrigerant; when it turns into gaseous ammonia, heat is absorbed, which causes the temperature of the liquid to drop.

This post was last edited by Xieshui on 2010-3-13 at 18:23. Look up the principle of the CO2 stripping method; the process conditions specify a reaction temperature of 183 degrees. For the N/C ratio, the lowest value used is 2.89 (on a molecular scale). The pressure in the synthesis tower is not a variable – it depends only on temperature and the N/C ratio. If you examine the phase diagram, when the reaction pressure remains constant and the N/C ratio increases, that is, as the N/C ratio moves to the right along the horizontal axis, the resulting composition falls on a temperature curve below 183 degrees. (As mentioned earlier, the formation process is endothermic, and the product stream carries away energy.) In the high-pressure condenser, the condensation point corresponds to a composition located to the right of the highest boiling point. As more ammonia is added, the condensation temperature drops; when the N/C ratio is 2.38, the condensation temperature is approximately 164.7 degrees. Beyond this point, the temperature drops further. I hope this information is useful for your reference and learning.

Newcomers can see everyone’s replies and learn from them