Process for the removal of urea, ammonia, and carbon dioxide fro

Details Process for the removal of urea, ammonia, and carbon dioxide fro Process for the removal of urea, ammonia, and carbon dioxide fro

1981-11-30

1984-06-26

Castel, Benoit

Liquid purification or separation

Processes

Chemical treatment

210752, 210766, 210774, 564 73, 55 38, 55 70, B01D 326, C02F 120

Patent

active

044565356

ABSTRACT:
An improved process for the removal of urea, ammonia, and carbon dioxide from dilute aqueous solutions thereof by hydrolyzing the urea, and thereafter desorbing ammonia and carbon dioxide. The dilute solution containing urea is passed into the top portion of a reaction column and caused to flow downward and countercurrent to a heating and stripping gas while maintaining the reaction column at a pressure of between about 10 and 30 bar, and a top column temperature of between about 170.degree. and 220.degree. C. and a bottom column temperature of between about 180.degree. and 230.degree. C. The resulting liquid stream removed from the bottom of the reaction column, comprised of a substantially urea-free aqueous solution of ammonia and carbon dioxide, is introduced into a desorption zone wherein, at a pressure of between about 1 and 5 bar, ammonia and carbon dioxide are removed therefrom.

REFERENCES:
patent: 4341640 (1982-07-01), Landis
E.P.A. Development Document, 440/1-73/011, Nov. 1973, pp. 81 and 103-105.

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