Method For The Co Production Of Methyl Mercaptan And Dimethyl Disulfide From Carbon Oxides

Abstract: The invention relates to a process for the co-production of methyl mercaptan and dimethyl disulfide, comprising the following successive steps: a) reacting at least one carbon oxide in the presence of hydrogen sulfide (H2S) and hydrogen in order to produce a stream (M) comprising methyl mercaptan, water, and possibly unreacted hydrogen sulfide, b) purifying the stream (M) to obtain a stream (N) enriched in methyl mercaptan and a stream containing the noncondensibles (MIncond), c) optionally recycling the stream of noncondensibles(MIncond) from step b) in step a), d) recovering a first portion of the stream (N) comprising methyl mercaptan purified in step b), e) sulfur oxidation of the second portion of the stream (N) of methyl mercaptan in order to produce a stream (O) including dimethyl disulfide, hydrogen sulfide, and possibly unreacted methyl mercaptan, f) purifying the stream (O) in order to separate, on the one hand, the enriched dimethyldisulfide and, on the other hand, the hydrogen sulfide and possibly the methyl mercaptan that was not reacted in step e), g) recycling the hydrogen sulfide and possibly the methyl mercaptan which were isolated in step f) to the stream (M) resulting from step a), h) recovering the dimethyldisulfide isolated in step f).

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