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Liquid redox chemistry has been employed for sulfur removal and recovery applications since the 1950's. The first process was the Stretford process, which was used commercially in the United Kingdom in the 1960's as a replacement for the iron sponge process in the treatment of sour town gas. The Stretford process has been joined in the United States' marketplace by several other liquid redox processes including the Unisulf, Sulfolin, LO‐CAT, SulFerox, and Hiperion processes. This paper describes the chemistry and engineering options available with each process, as well as the environmental and cost considerations associated with these processes.

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