Treatment of water vapor generated in concentrating an aqueous u

Details Treatment of water vapor generated in concentrating an aqueous u Treatment of water vapor generated in concentrating an aqueous u

1975-05-14

1977-01-18

Bernstein, Hiram H.

Distillation: processes, separatory

With disparate physical separation

Utilizing liquid sorption of component from gas or vapor

203 87, 260555A, C07C12602

Patent

active

040038017

ABSTRACT:
Water vapor generated in concentrating an aqueous urea solution and containing a small amount of aqueous urea solution mist, ammonia and carbon dioxide is treated to recover urea and ammonia values. The water vapor is introduced into a separator wherein all of the urea solution mist is separated together with a part of the ammonia and the carbon dioxide to form a first condensate. The water vapor is then fed into a surface cooler wherein the water vapor is indirectly cooled to form a second condensate. The first condensate is used for process water and the second condensate is subjected to rectification to separate ammonia and carbon dioxide contained therein in the form of a mixed gas, which is recovered, from the remaining waste water free of ammonia and carbon dioxide.

REFERENCES:
patent: 3506710 (1970-04-01), Inoue
patent: 3573173 (1971-03-01), Otsuka
patent: 3725210 (1973-04-01), Otsuka
patent: 3944605 (1976-03-01), Inoue

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