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US 8,372,365 B2Granted
High pressure reduction-oxidation desulfurization process
AssigneeMerichem Company
InventorGary J. Nagl
Life of this patent
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Abstract
An improved process for reduction-oxidation desulphurization uses an oxidizer operating at a pressure greater than the absorber where a liquid reduction-oxidation catalyst solution contacts a sulfur-containing gas feed stream.
Claims5
A process for continuously removing hydrogen sulfide from a gaseous stream comprising the following steps in combination:
- a. providing a feed stream containing hydrogen sulfide to an reduction-oxidation process;
- b. contacting the feed gas stream with a chelated metal catalyst in an absorber operating a pressure P1 that is greater than 100 psig to produce a first stream of hydrogen sulfide-free gas and a second stream comprising elemental sulfur and chelated metal catalyst solution;
- c. removing the first stream from the process;
- d. providing an oxidizer operating a pressure P2, where P2≧P1+5 psi;
- e. directing at least a portion of the second stream from step b. to the oxidizer;
- f. introducing a pressurized, oxygen containing gas stream into the oxidizer such that the oxygen diffuses through and contacts the second stream;
- and
- g. separating elemental sulfur from the chelated metal catalyst solution in the oxidizer and removing the sulfur from the reduction-oxidation process.
5 more elements
Dependencies are inferred from the claim text.