Simultaneous high efficiency capture of CO.sub.2 and H.sub.2S from pressurized gas
Low-cost and energy-efficient CO.sub.2 and H.sub.2S capture is provided obtaining greater than 99.9% capture efficiency from pressurized gas. The acid species are captured in an ammonia solution, which is then regenerated by stripping the absorbed species. The solution can capture as much as 330 grams of CO.sub.2 and H.sub.2S per 1000 gram of water and when regenerated it produces pure pressurized acid gas containing more than 99.7% CO.sub.2 and H2S. The absorption of the acid species is accomplished in two absorbers in-series, each having multiple stages. More than 95% of the acid species are captured in the first absorber and the balance is captured in the second absorber to below 10 ppm concentration in the outlet gas. The two absorbers operate at temperatures ranging from 20-70 degrees Celsius. The two absorbers and the main stripper of the alkaline solution operate at similar pressures ranging from 5-200 bara.
- Research Organization:
- SRI International, Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FE0000896
- Assignee:
- SRI International (Menlo Park, CA)
- Patent Number(s):
- 9,463,416
- Application Number:
- 14/347,017
- OSTI ID:
- 1328706
- Resource Relation:
- Patent File Date: 2012 Sep 26
- Country of Publication:
- United States
- Language:
- English
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