Process for purifying gases containing HCN

Details Process for purifying gases containing HCN Process for purifying gases containing HCN

1972-12-27

1976-04-27

Vertiz, Oscar R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423226, 423237, 423313, 423396, 423470, 423546, C01C 304, C01C 1247

Patent

active

039535770

ABSTRACT:
Gases containing hydrogen cyanide, ammonia and hydrogen sulfide are purified by first washing the gas with a suspension of solid sulfur to fix the hydrogen cyanide as ammonium thiocyanate and ammonium thiosulfate. The resulting suspension is then subjected to a wet-oxidation wherein the thiosulfate and a part of the thiocyanate is converted into sulfuric acid and ammonium sulfate afterwhich the resulting liquid containing unreacted thiocyanate is decomposed into an ammonium salt and is recovered from the oxidation and decomposition steps.

REFERENCES:
patent: 1148368 (1915-07-01), Evans
patent: 1924206 (1933-08-01), Hansen
patent: 1932819 (1933-10-01), Hansen
patent: 1986899 (1935-01-01), Sperr, Jr.
patent: 2621108 (1952-12-01), Hill
patent: 2819950 (1958-01-01), Patton

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