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US 4,359,450 AGranted
Process for the removal of acid gases from gaseous streams
AssigneeShell Oil Company
InventorsGeorge C. Blytas, Zaida Diaz
Life of this patent
Estimating the term…
Abstract
Hydrogen sulfide, carbon dioxide, and carbonyl sulfide are removed from a gas stream in a staged procedure characterized by absorption of the CO.sub.2 and COS and conversion of the hydrogen sulfide to produce sulfur in an absorbent mixture, hydrolysis of the carbonyl sulfide to produce a gas stream of hydrogen sulfide and carbon dioxide, and removal of the hydrogen sulfide from the gas stream.
Claims36
A process for the removal of H.sub.2 S, CO.sub.2, and COS from a sour gaseous stream containing H.sub.2 S, CO.sub.2, and COS comprising:
- (a) contacting said sour gaseous stream in a contacting zone with a lean CO.sub.2, COS-selective liquid absorbent mixture containing an effective amount of an oxidizing reactant under conditions to produce a sweet gaseous stream and a liquid absorbent admixture containing absorbed CO.sub.2, COS, solid sulfur, and a reduced reactant;
- (b) stripping CO.sub.2 and COS from said absorbent admixture in a stripping zone to produce a gas stream comprising CO.sub.2 and COS;
- (c) contacting the gas stream comprising CO.sub.2 and COS with a catalyst for the hydrolysis of COS, in the presence of water, and under conditions to react COS and water and produce a gas stream containing CO.sub.2 and H.sub.2 S;
- (d) and removing the H.sub.2 S from the gas stream.
1 more element
A process for the removal of H.sub.2 S, CO.sub.2, and COS from a sour gaseous stream containing H.sub.2 S, CO.sub.2, and COS comprising:
- (a) contacting said sour gaseous stream in a contacting zone with a lean CO.sub.2, COS-selective liquid absorbent mixture containing an effective amount of an oxidizing reactant, under conditions to produce a sweet gaseous stream and a liquid absorbent admixture containing absorbed CO.sub.2, COS, solid sulfur and a reduced reactant;
- (b) stripping CO.sub.2 and COS from said absorbent admixture in a stripping zone to produce a gas stream comprising CO.sub.2 and COS;
- (c) contacting the gas stream comprising CO.sub.2 and COS with a catalyst for the hydrolysis of COS, in the presence of water, and under conditions to convert COS and water and produce a gas stream containing CO.sub.2 and H.sub.2 S;
- (d) removing the H.sub.2 S from the gas stream by contacting the gas stream with an aqueous reactant solution which comprises an effective amount of an oxidizing reactant, and producing a purified gas stream and reactant solution containing sulfur.
1 more element
A process for the removal of H.sub.2 S, CO.sub.2, and COS from a sour gaseous stream containing H.sub.2 S, CO.sub.2, and COS comprising:
- (a) contacting said sour gaseous stream in a contacting zone with a lean CO.sub.2, COS-selective liquid absorbent mixture containing an effective amount of an oxidizing reactant selected from polyvalent metal ions, polyvalent metal chelate compounds, and mixtures thereof, under conditions to produce a sweet gaseous stream and a liquid absorbent admixture containing absorbed CO.sub.2, COS, solid sulfur and a reduced reactant;
- (b) stripping CO.sub.2 and COS from said absorbent admixture in a stripping zone to produce a gas stream comprising CO.sub.2 and COS;
- (c) contacting the gas stream comprising CO.sub.2 and COS with a catalyst for the hydrolysis of COS, in the presence of water, and under conditions to react COS and water and produce a gas stream containing CO.sub.2 and H.sub.2 S;
- (d) and removing the H.sub.2 S from the gas stream.
1 more element
A process for the removal of H.sub.2 S, CO.sub.2, and COS from a sour gaseous stream containing H.sub.2 S, CO.sub.2, and COS comprising:
- (a) contacting said sour gaseous stream in a contacting zone with a lean CO.sub.2, COS-selective liquid absorbent mixture containing an effective amount of an oxidizing reactant selected from polyvalent metal ions, polyvalent metal chelate compounds, and mixtures thereof, under conditions to produce a sweet gaseous stream and a liquid absorbent admixture containing absorbed CO.sub.2, COS, solid sulfur and a reduced reactant;
- (b) stripping CO.sub.2 and COS from said absorbent admixture in a stripping zone to produce a gas stream comprising CO.sub.2 and COS;
- (c) contacting the gas stream comprising CO.sub.2 and COS with a catalyst for the hydrolysis of COS, in the presence of water, and under conditions to convert COS and water and produce a gas stream containing CO.sub.2 and H.sub.2 S;
- (d) removing the H.sub.2 S from the gas stream by contacting the gas stream with an aqueous oxidizing reactant solution which comprises an effective amount of a reactant selected from polyvalent metal ions, polyvalent metal chelate compounds, and mixtures thereof, and producing a purified gas stream and reactant solution containing sulfur.
1 more element
A process for the removal of H.sub.2 S, CO.sub.2, and COS from a sour gaseous stream containing H.sub.2 S, CO.sub.2, and COS comprising:
- (a) contacting said sour gaseous stream in a contacting zone with a lean CO.sub.2, COS-selective liquid absorbent mixture containing an effective amount of an oxidizing reactant comprising polyvalent metal ions, polyvalent metal chelate compounds, and mixtures thereof, under conditions to produce a sweet gaseous stream and a liquid absorbent admixture containing CO.sub.2, COS, solid sulfur and a reduced reactant;
- (b) stripping CO.sub.2 and COS from said absorbent admixture in a stripping zone to produce a gas stream comprising CO.sub.2 and COS;
- (c) contacting the gas stream comprising CO.sub.2 and COS with a catalyst for the hydrolysis of COS, in the presence of water, and under conditions to react COS and water and produce a gas stream containing CO.sub.2 and H.sub.2 S;
- (d) removing the H.sub.2 S from the gas stream;
- (e) regenerating the absorbent admixture remaining from step (b) in a regeneration zone with oxygen to produce a regenerated reactant absorbent admixture;
- (f) employing regenerated absorbent admixture as lean CO.sub.2, COS-selective liquid reacant absorbent mixture in the contacting zone.
3 more elements
Dependencies are inferred from the claim text.