Process for removal of ammonia and acid gases from contaminated

Details Process for removal of ammonia and acid gases from contaminated Process for removal of ammonia and acid gases from contaminated

1984-08-30

1985-10-15

Spitzer, Robert

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

55 37, 55 70, 210643, B01D 1900, B01D 1300

Patent

active

045472939

ABSTRACT:
Contaminating basic gases, i.e., ammonia, and acid gases, e.g., carbon dioxide, are removed from process waters or waste waters in a combined extraction and stripping process. Ammonia in the form of ammonium ion is extracted by an immiscible organic phase comprising a liquid cation exchange component, especially an organic phosphoric acid derivative, and preferably di-2-ethyl hexyl phosphoric acid, dissolved in an alkyl hydrocarbon, aryl hydrocarbon, higher alcohol, oxygenated hydrocarbon, halogenated hydrocarbon, and mixtures thereof. Concurrently, the acidic gaseous contaminants are stripped from the process or waste waters by stripping with steam, air, nitrogen, or the like. The liquid cation exchange component has the ammonia stripped therefrom by heating, and the component may be recycled to extract additional amounts of ammonia.

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Cahn et al., "Removal of Ammonium Sulfide from Wastewater by Liquid Membrane Process", Environmental Science & Technology, 12, 1051-1055, (1978).

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