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US 4,497,784 AGranted
Solution removal of HCN from gaseous streams, with hydrolysis of thiocyanate formed
AssigneeShell Oil Company
InventorZaida Diaz
Life of this patent
Estimating the term…
Abstract
A process for the removal of HCN from gaseous streams is described, the process being characterized by reaction of the HCN in the gaseous stream with an ammonium polysulfide solution, formation of ammonium thiocyanate, and hydrolysis of the ammonium thiocyanate. Recycle of hydrolysis products is contemplated.
Claims6
A process for removing hydrogen cyanide from a gaseous stream containing hydrogen cyanide comprising
- (a) contacting said gaseous stream in a contact zone with a solution containing ammonium polysulfide under conditions to convert hydrogen cyanide, and producing a solution containing ammonium polysulfide and ammonium thiocyanate, and a gas stream having reduced hydrogen cyanide content;
- (b) removing solution containing ammonium polysulfide and ammonium thiocyanate from the contact zone, and hydrolyzing the ammonium thiocyanate in the removed solution to produce ammonia, hydrogen sulfide, and carbon dioxide.
A process for removing hydrogen cyanide from a gaseous stream containing hydrogen cyanide comprising
- (a) contacting said gaseous stream in a contact zone with a solution containing ammonium polysulfide under conditions to convert hydrogen cyanide, and producing a solution containing ammonium polysulfide, sulfur, and ammonium thiocyanate, and a gas stream having reduced hydrogen cyanide content;
- (b) removing solution containing ammonium polysulfide, sulfur, and ammonium thiocyanate from the contact zone, and hydrolyzing the ammonium thiocyanate in the removed solution in a hydrolysis zone to produce ammmonia, hydrogen sulfide, and carbon dioxide;
- and
- (c) recovering sulfur from the hydrolysis zone.
1 more element
Dependencies are inferred from the claim text.