Patent ID: 11878957
Assignee: TOYO ENGINEERING CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC C

Claim 1:
2. The process for urea production according to claim 1, comprising:
a purification step comprising heating, at a pressure lower than the pressure in the high-pressure decomposition step and higher than atmospheric pressure, the urea synthesis solution after being processed in the high-pressure decomposition step to generate a gas phase and a liquid phase, and by separating the gas phase, obtaining a urea synthesis solution having an increased urea concentration and generating a low-pressure steam condensate, a part of the low-pressure steam generated in the condensation step being used as a heat source for heating the urea synthesis solution after being processed in the high-pressure decomposition step;
a concentration step comprising heating, at a pressure lower than the pressure in the purification step and equal to or lower than the atmospheric pressure, the urea synthesis solution after being processed in the purification step to generate a gas phase and a liquid phase, and by separating the gas phase, obtaining a urea synthesis solution having a further increased urea concentration and generating a low-pressure steam condensate, another part of the low-pressure steam generated in the condensation step being used as a heat source for heating the urea synthesis solution after being processed in the purification step; and
a low-low-pressure fluid generation step comprising reducing in pressure at least a part of the low-pressure steam condensate obtained from one or both of the purification step and the concentration step to a pressure equal to or higher than the atmospheric pressure, generating a low-low-pressure steam condensate and a low-low-pressure steam, wherein
in step a), the low-low-pressure steam condensate is used as the steam condensate having a temperature higher than 90° C.