The invention relates to a process for the co-production of methyl mercaptan and of dimethyl disulfide, comprising the following successive steps: a) reaction of at least one carbon oxide in the presence of hydrogen sulfide (H.sub.2S) and hydrogen to form a stream (M) comprising methyl mercaptan, water, and possibly unreacted hydrogen sulfide, b) purification of the stream (M) to obtain a stream (N) enriched in methyl mercaptan and a stream containing the uncondensable compounds (M.sub.uncond), c) optional recycling of the stream of uncondensable compounds (M.sub.uncond) obtained from step b) into step a), d) recovery of a first portion of the stream (N) including methyl mercaptan purified in step b), e) oxidation with sulfur of the second portion of the stream (N) of methyl mercaptan, to form a stream (O) comprising dimethyl disulfide, hydrogen sulfide, and possibly unreacted methyl mercaptan, f) purification of the stream (O) to separate, on the one hand, the enriched dimethyl disulfide and, on the other hand, the hydrogen sulfide and possibly the methyl mercaptan that has not reacted in step e), g) recycling of the hydrogen sulfide and possibly of the methyl mercaptan isolated in step f) into the stream (M) obtained from step a), h) recovery of the dimethyl disulfide isolated in step f).

The invention relates to a process for the co-production of methyl mercaptan and of dimethyl disulfide, comprising the following successive steps: a) reaction of at least one carbon oxide in the presence of hydrogen sulfide (H.sub.2S) and hydrogen to form a stream (M) comprising methyl mercaptan, water, and possibly unreacted hydrogen sulfide, b) purification of the stream (M) to obtain a stream (N) enriched in methyl mercaptan and a stream containing the uncondensable compounds (M.sub.uncond), c) optional recycling of the stream of uncondensable compounds (M.sub.uncond) obtained from step b) into step a), d) recovery of a first portion of the stream (N) including methyl mercaptan purified in step b), e) oxidation with sulfur of the second portion of the stream (N) of methyl mercaptan, to form a stream (O) comprising dimethyl disulfide, hydrogen sulfide, and possibly unreacted methyl mercaptan, f) purification of the stream (O) to separate, on the one hand, the enriched dimethyl disulfide and, on the other hand, the hydrogen sulfide and possibly the methyl mercaptan that has not reacted in step e), g) recycling of the hydrogen sulfide and possibly of the methyl mercaptan isolated in step f) into the stream (M) obtained from step a), h) recovery of the dimethyl disulfide isolated in step f).

Compositions comprising branched C.sub.10 mercaptans selected from the group consisting of 5-methyl-1-mercapto-nonane, 3-propyl-1-mercapto-heptane, 4-ethyl-1-mercapto-octane, 2-butyl-1-mercapto-hexane, 5-methyl-2-mercapto-nonane, 3-propyl-2-mercapto-heptane, 4-ethyl-2-mercapto-octane, 5-methyl-5-mercapto-nonane, and combinations thereof. Compositions comprising C.sub.11+ mercaptans, wherein the C.sub.11+ mercaptans are characterized by structure R.sup.6—SH, wherein R.sup.6 is an alkyl group derived from one or more C.sub.11+ monoolefins, and wherein the one or more C.sub.11+ monoolefins comprise C.sub.11 internal monoolefins, C.sub.12 internal monoolefins, C.sub.13 internal monoolefins, C.sub.14 internal monoolefins, 1-tetradecene, 1-hexadecene, or combinations thereof.

Compositions comprising branched C.sub.10 mercaptans selected from the group consisting of 5-methyl-1-mercapto-nonane, 3-propyl-1-mercapto-heptane, 4-ethyl-1-mercapto-octane, 2-butyl-1-mercapto-hexane, 5-methyl-2-mercapto-nonane, 3-propyl-2-mercapto-heptane, 4-ethyl-2-mercapto-octane, 5-methyl-5-mercapto-nonane, and combinations thereof. Compositions comprising C.sub.11+ mercaptans, wherein the C.sub.11+ mercaptans are characterized by structure R.sup.6—SH, wherein R.sup.6 is an alkyl group derived from one or more C.sub.11+ monoolefins, and wherein the one or more C.sub.11+ monoolefins comprise C.sub.11 internal monoolefins, C.sub.12 internal monoolefins, C.sub.13 internal monoolefins, C.sub.14 internal monoolefins, 1-tetradecene, 1-hexadecene, or combinations thereof.

Compositions comprising branched C.sub.10 mercaptans selected from the group consisting of 5-methyl-1-mercapto-nonane, 3-propyl-1-mercapto-heptane, 4-ethyl-1-mercapto-octane, 2-butyl-1-mercapto-hexane, 5-methyl-2-mercapto-nonane, 3-propyl-2-mercapto-heptane, 4-ethyl-2-mercapto-octane, 5-methyl-5-mercapto-nonane, and combinations thereof. Compositions comprising C.sub.11+ mercaptans, wherein the C.sub.11+ mercaptans are characterized by structure R.sup.6—SH, wherein R.sup.6 is an alkyl group derived from one or more C.sub.11+ monoolefins, and wherein the one or more C.sub.11+ monoolefins comprise C.sub.11 internal monoolefins, C.sub.12 internal monoolefins, C.sub.13 internal monoolefins, C.sub.14 internal monoolefins, 1-tetradecene, 1-hexadecene, or combinations thereof.

The present invention discloses high pressure flow reactor vessels and associated systems. Also disclosed are processes for producing thiol compounds and sulfide compounds utilizing these flow reactor vessels.

The present invention discloses high pressure flow reactor vessels and associated systems. Also disclosed are processes for producing thiol compounds and sulfide compounds utilizing these flow reactor vessels.

An object of the present invention is to provide a dialkyl sulfide which can effectively form a metal sulfide film on a metal surface even in a low-temperature environment, has excellent storage stability, and is suitable as an extreme-pressure additive. The present invention provides a dialkyl sulfide represented by general formula (1) below (in the formula, R.sup.1 and R.sup.2 each independently represent an alkyl group, and n is an integer), wherein the content of a compound having an n value of 1 in the general formula (1) is 10.0% by mass or less relative to the total amount of compounds represented by the general formula (1) ##STR00001##

An object of the present invention is to provide a dialkyl sulfide which can effectively form a metal sulfide film on a metal surface even in a low-temperature environment, has excellent storage stability, and is suitable as an extreme-pressure additive. The present invention provides a dialkyl sulfide represented by general formula (1) below (in the formula, R.sup.1 and R.sup.2 each independently represent an alkyl group, and n is an integer), wherein the content of a compound having an n value of 1 in the general formula (1) is 10.0% by mass or less relative to the total amount of compounds represented by the general formula (1) ##STR00001##

An object of the present invention is to provide a dialkyl sulfide which can effectively form a metal sulfide film on a metal surface even in a low-temperature environment, has excellent storage stability, and is suitable as an extreme-pressure additive. The present invention provides a dialkyl sulfide represented by general formula (1) below (in the formula, R.sup.1 and R.sup.2 each independently represent an alkyl group, and n is an integer), wherein the content of a compound having an n value of 1 in the general formula (1) is 10.0% by mass or less relative to the total amount of compounds represented by the general formula (1) ##STR00001##