Method of recovering ammonia from an aqueous effluent which cont

Details Method of recovering ammonia from an aqueous effluent which cont Method of recovering ammonia from an aqueous effluent which cont

1986-05-23

1988-04-19

Bashore, S. Leon

Distillation: processes, separatory

With disparate physical separation

Utilizing liquid sorption of component from gas or vapor

203 75, 203 77, 203 78, 203 80, 203 90, 203DIG9, 55 44, 55 50, 55 70, B01D 300

Patent

active

047387548

ABSTRACT:
An aqueous effluent is supplied to a stripping column (total stripping column) from which a mixture that is rich in NH.sub.3, CO.sub.2 and H.sub.2 S is withdrawn as a head product. In at least one additional stripping column the mixture is separated into a mixture which is rich in NH.sub.3 and a mixture which is rich in the sour gaes CO.sub.2 and H.sub.2 S. The mixture which is rich in NH.sub.3 is scrubbed with liquid ammonia. The overhead product from the total stripping column is cooled in a condenser under a pressure of 1 to 7 bars and is thus transformed into a liquid phase to such an extent that the liquid phase contains 70 to 100% of the NH.sub.3 which has been supplied to the condenser. The liquid phase is supplied at a temperature of 30.degree. to 90.degree. C. to a second stripping column (NH.sub.3 stripping column), which is operated under a pressure of 1 to 4 bars and from which a gas mixture that is rich in NH.sub.3 is withdrawn as a head product. The gas mixture is scrubbed with water and ammonia and the NH.sub.3 gas which has been scrubbed is condensed.

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