Method of removing hydrogen sulfide from gas
The process for absorbing hydrogen sulfide from hydrogenated or hydrolyzed Claus process gas by contacting said gas and an alkaline aqueous solution containing dissolved oxidation-reduction components in at least a primary and a final gas-liquid scrubber stage to effect the absorption of the hydrogen sulfide from the gas. The hydrogen sulfide is subsequently oxidized to elemental sulfur in the washing solution. The fresh washing solution is first introduced to the final stage for contact with gas of reduced hydrogen sulfide content from the prior stages to effect the transfer of dissolved and entrained oxygen from the washing solution to the gas. The thus treated washing solution is then passed to at least the primary scrubber stage for contact with incoming hydrogen sulfide rich gas under conditions which avoid a high rate of thiosulfate and sulfate formation due to the presence of oxygen. The washing solution is thereafter regenerated by contact with an oxygen-containing gas and the elemental sulfur is recovered therefrom.
- Assignee:
- Union Oil Co. of California
- Patent Number(s):
- US 4125597
- OSTI ID:
- 6444681
- Country of Publication:
- United States
- Language:
- English
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