Process for purifying gases containing HCN

Patent · Tue Apr 27 04:00:00 EDT 1976

OSTI ID:7340562

Ooka, I; Tomihisa, N; Nogami, Y; Katagiri, K

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. 14 Claims, 2 Drawing Figures.

• Assignee: Osaka Gas Co., Ltd.
• Patent Number(s): US 3953577
• OSTI ID: 7340562
• Country of Publication: United States
• Language: English

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