Oxysulfreen
Oxysulfreen : A multi-stage variation of the Sulfreen process for removing sulfur compounds from the off-gases from the Claus process. In the first stage, the sulfur in all the organic sulfur compounds is converted to hydrogen sulfide by hydrodesulfurization over a cobalt/molybdenum/alumina catalyst. After removal of water, some of this hydrogen sulfide is oxidized to sulfur dioxide over a titania catalyst. The final stage is the Sulfreen version of the Claus process, in which the remaining hydrogen sulfide is reacted with the sulfur dioxide to produce elemental sulfur. See also: Hydrosulfreen, Sulfreen
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