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US 4,572,826 AGranted
Two stage process for HCN removal from gaseous streams
AssigneeShell Oil Company
InventorGeorge R. Moore
Life of this patent
Estimating the term…
Abstract
HCN is removed from a gaseous stream, e.g., a synthesis gas stream, by a two stage procedure in which the gaseous stream is first contacted with a specified oxygenated reactant composition to remove the bulk of the HCN, and then the gaseous stream is contacted with a polysulfide solution to reduce further the HCN content of the stream.
Claims8
A process for removing HCN from a gaseous stream comprising
- (a) contacting said stream with a compound having the formula ##STR4## wherein R.sub.1 and R.sub.2 are hydrogen or alkyl containing 1 through 3 carbon atoms, provided that R.sub.1 and R.sub.2 are never simultaneously alkyl;
- precursors of said compounds;
- and mixtures of said compounds, precursors, and compounds and precursors, in an amount sufficient to remove at least the bulk of the HCN, under conditions to convert HCN, and producing a partially-purified gas stream having reduced HCN content;
- (b) contacting said partially-purified gas stream with an effective amount of an aqueous solution containing a reactant selected from ammonium polysulfide, sodium polysulfide, and a mixture of ammonium polysulfide and sodium polysulfide, under conditions to convert HCN, producing a purified gas stream with a further reduced HCN content.
1 more element
Dependencies are inferred from the claim text.