Liquid purification or separation – Processes – Chemical treatment
Patent
1984-03-21
1985-06-11
Wyse, Thomas
Liquid purification or separation
Processes
Chemical treatment
210904, 55 48, 55 53, 55 68, 55 70, C02F 120, C02F 158
Patent
active
045227306
ABSTRACT:
A condensate which contains cyanide ions, hydrogen sulfide and ammonia is first partly purified by stripping with water vapor and stripped-off gases are then scrubbed with an absorbent. The laden absorbent contains 50 to 300 grams ammonia and 10 to 100 grams hydrogen sulfide and is at a temperature of 70.degree. to 150.degree. C. and has a pH value of at least 9. Sulfur is added to the condensate or the laden aqueous absorbent in a quantity which is at least 0.8 times the quantity that is stoichiometrically required to convert the cyanide ions to thiocyanate ions. The sulfur may be produced from hydrogen sulfide and oxygen, preferably in the presence of an oxidation catalyst. Alternatively, the sulfur may be added to a liquid which contains 10 to 400 grams ammonia and/or ammonium ions per liter so that ammonium polysulfide is formed. That solution is mixed with the liquid that contains cyanide ions.
REFERENCES:
patent: 3540867 (1970-11-01), Baron et al.
patent: 3972693 (1976-08-01), Wiesner et al.
patent: 4031030 (1977-06-01), Rudolph
patent: 4060591 (1977-11-01), Garber et al.
patent: 4065273 (1977-12-01), Rudolph
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patent: 4311597 (1982-01-01), Bhattacharyya
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Article by Dr. F. Wohler entitled "Removal and Recovery of Phenol and Ammonia from Gas Liquor" (Chemsa May 1979).
German-Language Excerpt from "Ullmans Encyklopadie der technisch en Chemie", 4th Edition, vol. 14.
Hochgesand Gerhard
Kahles Heinz
Stonner Hans-Martin
Wiesner Paul
Dubno Herbert
Metallgesellschaft Aktiengesellschaft
Ross Karl F.
Wyse Thomas
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