Process for synthesizing urea

Details Process for synthesizing urea Process for synthesizing urea

1981-09-01

1982-10-12

Doll, John

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564 70, 564 71, 564 72, C07C12002

Patent

active

043540406

ABSTRACT:
In a synthesis of urea using ammonia in a highly excessive molar ratio, unreacted materials are decomposed and separated by subjecting the urea synthesis effluent to a stripping step using carbon dioxide at a pressure equal to the urea synthesis pressure. The thus-separated gaseous mixture of ammonia and carbon dioxide is condensed through an indirect heat exchange with an effluent stream discharged from the stripping step and lowered to a predetermined pressure level. Resulting condensation heat is used for the decomposition and separation of unreacted materials still remaining in said effluent stream. By choosing suitable operation conditions for each step of the present invention, it is possible to reduce the amount of high pressure steam to be required and to minimize the amount of low pressure steam to be recovered.

REFERENCES:
patent: 3090811 (1963-05-01), Otsuka et al.
patent: 3711544 (1973-01-01), Summerville et al.
patent: 4081469 (1978-03-01), Ono et al.
patent: 4110374 (1978-08-01), Inoue
patent: 4301299 (1981-11-01), Inoue et al.

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