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

Claim 20:
21. The apparatus for urea production according to claim 13, comprising a recovering apparatus configured to absorb and condense, 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 condenser, and
gas II is a gas obtained as a gas phase separated by a purification apparatus when the apparatus for urea production comprises the purification apparatus, and
simultaneously cool the absorption medium, which has absorbed the at least one gas, to obtain a recovered liquid containing ammonia and carbon dioxide, wherein
the purification apparatus is an apparatus configured to, by heating, at a pressure lower than the pressure in the high-pressure decomposer and higher than atmospheric pressure, the urea synthesis solution after being processed by the high-pressure decomposer to generate a gas phase and a liquid phase, and by separating the gas phase, obtain a urea synthesis solution having an increased urea concentration and generate a low-pressure steam condensate, a part of the low-pressure steam generated by the condenser being used as a heat source for heating the urea synthesis solution after being processed by the high-pressure decomposer,
the recovering apparatus is configured to perform the cooling in the recovering apparatus by heat exchange with hot water, and
the second heat exchange structure is configured to perform the heating in the second heat exchange structure by heat-exchanging the hot water after being used for the cooling in the recovering apparatus with the steam condensate obtained from the first heat exchange structure.