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

Claim 0:
1. A process for urea production, comprising:
(i) a synthesis step comprising synthesizing urea from ammonia and carbon dioxide to generate a urea synthesis solution;
(ii) a high-pressure decomposition step of comprising heating the urea synthesis solution generated in the synthesis step, decomposing ammonium carbamate and separating a gaseous mixture containing ammonia and carbon dioxide from the urea synthesis solution; and
(iii) a condensation step comprising absorbing and condensing at least a part of the gaseous mixture obtained in the high-pressure decomposition step in an absorption medium and generating a low-pressure steam from a steam condensate with use of heat generated during the condensation,
the process for urea production further comprising:
a) heat-exchanging a steam condensate having a temperature higher than 90° C. with another fluid to cool the steam condensate to 90° C. or less;
b) heat-exchanging the steam condensate obtained from step a) with a further fluid having a temperature lower than a temperature of the low-pressure steam, thereby heating the steam condensate obtained from step a);
g) optionally heat-exchanging the steam condensate heated in step b) with the low-pressure steam generated in the condensation step to heat this steam condensate before providing this steam condensate to the condensation step as the steam condensate for generating the low-pressure steam; and
c) providing the steam condensate obtained from step b) or obtained from step a) when present, to the condensation step as the steam condensate for generating the low-pressure steam.