Recovery of ammonia from aqueous streams

Details Recovery of ammonia from aqueous streams Recovery of ammonia from aqueous streams

1979-09-07

1981-10-13

Veritz, O. R.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

C01C 102

Patent

active

042948126

ABSTRACT:
Fixed ammonia in an aqueous stream is converted to free ammonia in solution by mixing the stream with a lime slurry in a mixing zone. The resulting liquid mixture is heated by contact with steam-containing gas to a temperature of at least about 95.degree. C. to form a heated liquid mixture containing free ammonia in solution and an ammonia-rich product vapor. A portion of the heated liquid mixture is withdrawn and is contacted with steam in a packed stripping zone to produce liquid waste and vapor containing free ammonia and steam. At least a portion of the vapor from the stripper is used as steam-containing gas for heating the liquid mixture. Ammonia is recovered from ammonia-rich product vapor withdrawn from the mixing zone.

REFERENCES:
patent: 3278423 (1966-10-01), Millar
patent: 4104131 (1978-08-01), Didycz et al.
patent: 4111759 (1978-09-01), Didycz et al.
Olsen, "Unit Processes and Principles of Chemical Engineering", D. Van Nostrand Co., Inc. (1932), pp. 1-3.

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