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US 4,368,178 AGranted
Process for the removal of H.sub.2 S and CO.sub.2 from gaseous streams
AssigneeShell Oil Company
InventorZaida Diaz
Life of this patent
Estimating the term…
Abstract
A cyclic process for the simultaneous removal of hydrogen sulfide and carbon dioxide from a variety of gas streams is disclosed. The gas stream containing the sour gases is contacted with a solution of the Fe(III) chelate of nitrilotriacetic acid in an absorbent comprising diethylene glycol monoethyl ether. The hydrogen sulfide is converted to sulfur, the CO.sub.2 is absorbed to produce a purified gas stream, and the Fe(III) chelate is converted to the Fe(II) chelate. The process includes sulfur removal and regeneration of the absorbent and the Fe(III) chelate.
Claims24
A process for the removal of H.sub.2 S and CO.sub.2 from a sour gaseous stream comprising:
- (a) contacting the sour gaseous stream in a contact zone with a lean CO.sub.2 -selective liquid absorbent mixture comprising diethylene glycol monoethyl ether and an effective amount of the Fe(III) chelate of nitrilotriacetic acid, and producing a sweet gaseous stream and a liquid absorbent admixture containing absorbed CO.sub.2, solid sulfur, and Fe(II) chelate of nitrilotriacetic acid,
- (b) removing sulfur from said absorbent admixture, and leaving a solution containing absorbed CO.sub.2 and Fe(II) chelate of nitrilotriacetic acid,
- (c) stripping the solution containing absorbed CO.sub.2 and said Fe(II) chelate, and regenerating Fe(III) chelate of nitrilotriacetic acid in said solution with oxygen, producing a lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid, and
- (d) returning lean CO.sub.2 -selective absorbent solution containing Fe(III) chelate of nitrilotriacetic acid to the contacting zone.
1 more element
A process for the removal of H.sub.2 S and CO.sub.2 from a sour gaseous stream comprising:
- (a) contacting the sour gaseous stream in a contacting zone with a lean CO.sub.2 -selective liquid absorbent mixture comprising diethylene glycol monoethyl ether and an effective amount of the Fe(III) chelate of nitrilotriacetic acid, and producing a sweet gaseous stream and a liquid absorbent admixture containing absorbed CO.sub.2, solid sulfur, and Fe(II) chelate of nitrilotriacetic acid,
- (b) stripping said admixture containing absorbed CO.sub.2, sulfur, and said Fe(II) chelate to remove CO.sub.2, and then regenerating the Fe(III) chelate of nitrilotriacetic acid in said admixture with oxygen, producing a lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid, and sulfur,
- (c) removing sulfur from the lean CO.sub.2 -selective absorbent solution containing the sulfur and the Fe(III) chelate of nitrilotriacetic acid, and leaving a lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid, and
- (d) returning lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid to the contacting zone.
1 more element
A process for the removal of H.sub.2 S and CO.sub.2 from a sour gaseous stream comprising:
- (a) contacting the sour gaseous stream in a contacting zone with a lean CO.sub.2 -selective liquid absorbent mixture comprising diethylene glycol monoethyl ether and an effective amount of the Fe(III) chelate of nitrilotriacetic acid, and producing a sweet gaseous stream and a liquid absorbent admixture containing absorbed CO.sub.2, solid sulfur, and Fe(II) chelate of nitrilotriacetic acid,
- (b) removing sulfur from said absorbent admixture, and leaving a solution containing absorbed CO.sub.2 and Fe(II) chelate of nitrilotriacetic acid,
- (c) stripping the solution containing absorbed CO.sub.2 and said Fe(II) chelate and regenerating the Fe(III) chelate of nitrilotriacetic acid in said solution with oxygen, producing a lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid, and
- (d) returning lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid to the contacting zone.
1 more element
A process for the removal of H.sub.2 S and CO.sub.2 from a sour gaseous stream comprising:
- (a) contacting the sour gaseous stream in a contacting zone with a lean CO.sub.2 -selective liquid absorbent mixture comprising diethylene glycol monoethyl ether and an effective amount of the Fe(III) chelate of nitrilotriacetic acid, and producing a sweet gaseous stream and a liquid absorbent admixture containing absorbed CO.sub.2, solid sulfur, and the Fe(II) chelate of nitrilotriacetic acid,
- (b) stripping said admixture containing absorbed CO.sub.2, sulfur and said Fe(II) chelate and regenerating the Fe(III) chelate of nitrilotriacetic acid in said admixture with oxygen, producing a lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid, and sulfur,
- (c) removing sulfur from the lean CO.sub.2 -selective absorbent solution containing the sulfur and the Fe(III) chelate of nitrilotriacetic acid, and leaving a lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid, and
- (d) returning lean CO.sub.2 -selective absorbent solution containing the Fe(III) chelate of nitrilotriacetic acid to the contacting zone.
1 more element
Dependencies are inferred from the claim text.