Stretford process
The Stretford process was developed during the late 1940s to remove hydrogen sulfide (H2S) from town gas. It was the first liquid phase, oxidation process for converting H2S into sulfur to gain widespread commercial acceptance.[1] Developed by Tom Nicklin of the North-Western Gas Board (NWGB) and the Clayton Aniline Company, in Manchester, England, the name of the process was derived from the location of the NWGB's laboratories, in Stretford.
The process uses reduction-oxidation (redox) chemistry to oxidise the H2S into elemental sulfur, in an alkaline solution containing vanadium as an oxygen carrier.[2]
The process was licensed by NWGB, which later became part of British Gas. At the height of its popularity during the 1970s there were more a dozen companies offering the Stretford technology. By 1987 about 170 Stretford plants had been built worldwide, and more than 100 were still operating in 1992, capable of removing 400,000 tons of sulfur per year.[3] The first USA plant was commissioned in 1971 at Long Beach, California, to process the gas from offshore oil wells.[4]
See also
References
- Notes
- ↑ Nagl, Gary J (2005). "The State of Liquid Redox". Gas Technology Products. Merichem Company. Archived from the original on 2007-09-28. http://web.archive.org/web/20070928174054/http://www.gtp-merichem.com/support/technical_papers/liquid_redox.php. Retrieved 24 May 2007.
- ↑ "Process Screening Analysis of Alternative Gas Treating and Sulfur Removal for Gasification" (PDF). SFA Pacific. 2002. http://www.netl.doe.gov/technologies/coalpower/gasification/pubs/pdf/SFA%20Pacific_Process%20Screening%20Analysis_Dec%202002.pdf. Retrieved 23 May 2007.
- ↑ Kohl & Nielsen 1999, p. 771
- ↑ "...briefly...", Chemical & Process Engineering 52: 7, 1971
- Bibliography
- Kohl, Arthur L.; Nielsen, Richard (1999), Gas Purification (5 ed.), Gulf Professional Publishing, ISBN 978-0-88415-220-0
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