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

Claim 7:
8. The process for urea production according to claim 1, comprising a recovering step comprising absorbing and condensing, in an absorption medium, at least one gas of the following gas I and gas II:
gas I is a gas remaining uncondensed in the condensation step, and
gas II is a gas obtained as a gas phase separated in a purification step when the process for urea production comprises the purification step, and
simultaneously cooling the absorption medium, which has absorbed the at least one gas, to obtain a recovered liquid containing ammonia and carbon dioxide, wherein
the purification step is a 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,
the absorbing and cooling in the recovering step is performed together with the heating in step b), and
the cooling in the recovering step is performed by heat-exchanging the absorption medium, which has absorbed the at least one gas, with the steam condensate obtained from step a).