Process for purifying urea-containing waste water and process fo

Details Process for purifying urea-containing waste water and process fo Process for purifying urea-containing waste water and process fo

1980-05-08

1981-12-29

Veritz, O. R.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

423358, C01C 108, C07D25160

Patent

active

043083854

ABSTRACT:
An improved process for the removal of urea from urea-containing waste water by hydrolysis and desorption of the ammonia and carbon dioxide thus formed. Urea-containing waste water is treated in a process for the separation of ammonia and carbon dioxide from mixtures thereof, which process has (a) an ammonia separation zone wherefrom ammonia, substantially free of carbon dioxide and water, is obtained, (b) a carbon dioxide separation zone wherefrom carbon dioxide, substantially free of ammonia and water is obtained, and (c) a desorption zone wherefrom water, substantially free of carbon dioxide and ammonia is obtained. The urea is substantially completely hydrolyzed and the ammonia and carbon dioxide produced thereby can be recovered.

REFERENCES:
patent: 3697521 (1972-10-01), Van Nassau et al.
patent: 4087513 (1978-05-01), Schell
patent: 4120667 (1978-10-01), Gettert et al.
patent: 4163648 (1979-08-01), Biermans

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