Process for the removal of H.sub.2 S and CO.sub.2 from gaseous streams
AssigneeShell Oil Company
InventorHans J. S. Winkler
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 N-(2-hydroxyethyl) ethylene diamine triacetic acid in a CO.sub.2 selective solvent. 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 simultaneous regeneration of the solvent and the Fe (III) chelate.
Claims14
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 with a lean CO.sub.2 -selective absorbent mixture containing an effective amount of the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid, and producing a sweet gaseous stream and an absorbent admixture containing absorbed CO.sub.2, sulfur, and the Fe (II) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid,
- B. removing sulfur from the absorbent admixture, and leaving a solution containing absorbed CO.sub.2 and the Fe (II) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid,
- C. stripping the solution containing absorbed CO.sub.2 and the said Fe (II) chelate and regenerating the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid in said solution with an oxygen-containing gas, producing a lean CO.sub.2 -selective absorbent solution containing the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid, and
- D. returning the lean CO.sub.2 -selective absorbent solution containing the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid to step A.
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 with a lean CO.sub.2 -selective absorbent solution containing an effective amount of the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid, and producing a sweet gaseous stream and an absorbent mixture containing absorbed CO.sub.2, sulfur, and the Fe (II) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid,
- B. stripping the solution containing absorbed CO.sub.2, sulfur, and the said Fe (II) chelate and regenerating the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid in said solution with an oxygen-containing gas, producing a lean CO.sub.2 -selective absorbent solution containing the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid, and sulfur,
- C. removing sulfur from the lean CO.sub.2 -selective absorbent solution containing the sulfur and the Fe III chelate of N-(2-hydroxyethyl) ethylene diamine triactic acid, and leaving a lean CO.sub.2 -selective absorbent solution containing the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid, and
- D. returning the lean CO.sub.2 -selective absorbent solution containing the Fe (III) chelate of N-(2-hydroxyethyl) ethylene diamine triacetic acid to step A.
Dependencies are inferred from the claim text.