Process for separating ammonia and acid gases from streams conta

Details Process for separating ammonia and acid gases from streams conta Process for separating ammonia and acid gases from streams conta

1981-03-16

1982-04-06

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

For scale inhibiting or corrosion preventing

203 11, 203 22, 203 25, 203 36, 203 37, 203 78, 203 79, 203 80, 203 86, 203 87, 423357, B01D 338, C02F 104

Patent

active

043234305

ABSTRACT:
A process for the substantially complete removal of acid gases and ammonia from aqueous solutions is disclosed, which comprises a two stage distillation operation wherein the pressure in the first distillation stage is substantially less than the pressure in the second stage, the ammonia concentration in this stage decreases downwardly so that an aqueous bottoms stream has a pH less than 8, this aqueous bottoms stream is treated with alkali and then distilled in the second stage. A portion of the aqueous bottoms can be vaporized by indirect heat exchange with vapors evolving from the second stage. The improvement lies in adding ammonia to the overhead vapor from the first stage to reduce corrosion of the condenser and preferably, the amount of vapor condensed is controlled to further minimize corrosion.

REFERENCES:
patent: 1566795 (1925-12-01), Hefner et al.
patent: 1878979 (1932-09-01), Tiddy
patent: 2263688 (1941-11-01), Allen et al.
patent: 3278423 (1966-10-01), Millar
patent: 3989459 (1976-11-01), Nose et al.
patent: 4104131 (1978-08-01), Didycz et al.
patent: 4111759 (1978-09-01), Didycz et al.
patent: 4260462 (1981-04-01), Didycz et al.
Patent Application U.S. Ser. No. 633,522; William J. Didycz et al, "A Process for Separating Acid Gases and Ammonia From Dilute Aqueous Solutions Thereof", Filed Nov. 19, 1975.

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