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New catalyst permits cut in COS tail-gas emissions

, : New catalyst permits cut in COS tail-gas emissions. Oil and Gas Journal 84(28): 54-57

Carbonyl sulfide emissions in sulfur-recovery-plant tail gas can be reduced to 1-2 ppm by using a highly selective COS hydrolysis catalyst in tandem with a CoMo hydrogenation catalyst. Processes are described which when operated in conjunction with a Claus unit improve the sulfur recovery levels attainable with Claus-based units (typically 95-97%) to > 99.9%.

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