Abstract: A process for preparing an S,S?-dialkyldithiocarbonate from a dialkyl disulfide and from a particular metal catalyst, in the presence of carbon monoxide is described in addition to the use of S,S?-dialkyldithiocarbonates as reagents for the preparation of polycarbonates, compounds containing at least one urea and/or isocyanate function and compounds containing at least one thioalkyl function.

Abstract: The invention relates to a process for the co-production of alkyl mercaptan and of dialkyl disulfide, comprising the following successive steps: a) reaction of a C1-C4 alcohol in the presence of hydrogen sulfide (H2S) to form a stream (M) comprising an alkyl mercaptan, water, and possibly unreacted hydrogen sulfide, b) purification of the stream (M) to obtain a stream (N) enriched in alkyl mercaptan, c) recovery of a first portion of the stream (N) including the alkyl mercaptan purified in step b), d) oxidation with sulfur of the second portion of the stream (N) of alkyl mercaptan, to form a stream (O) comprising a dialkyl disulfide, hydrogen sulfide, and possibly unreacted alkyl mercaptan, e) purification of the stream (O) to separate, on the one hand, the enriched dialkyl disulfide and, on the other hand, the hydrogen sulfide and possibly the alkyl mercaptan that has not reacted in step d), f) recycling of the hydrogen sulfide and possibly of the alkyl mercaptan isolated in step e) into the stream (M) ob

Abstract: The present invention relates to a process for drying methyl mercaptan, notably by azeotropic distillation, comprising the following steps: 1) a stream (A) comprising methyl mercaptan and water is introduced into a distillation column (1); 2) said stream (A) is distilled in said column (1); 3) the distillate (B) is recovered in gaseous form, preferably at the top of the column; 4) the distillate (B) is condensed, preferably in a condenser (2), so as to obtain a condensate (C) in liquid form; 5) said condensate (C) is separated, preferably using a decanter (3), so as to obtain two separate liquid phases: an aqueous phase (D); and an organic phase (E) comprising methyl mercaptan; 6) all or part of the organic phase (E) is optionally introduced into the distillation column (1) as reflux; and 7) a stream (F) comprising the dried methyl mercaptan is recovered, preferably at the bottom of column (1).

Abstract: The present invention concerns a method for sulfhydrolysis from dialkyl sulfides and hydrogen sulfide, in the presence of a specific catalyst based on titanium dioxide and/or zirconium dioxide, as well as the corresponding use of such a catalyst. The present invention also concerns a method for preparing mercaptans, in particular methyl mercaptan, from at least one alcohol and hydrogen sulfide, comprising said sulfhydrolysis method.

Abstract: The present invention relates to a process for producing methyl mercaptan, comprising the following steps: A) methanol is reacted with hydrogen sulfide to form a stream (M), preferably in gaseous form, comprising methyl mercaptan, unreacted H2S and possibly sulfur byproducts; B) optionally, said stream (M) is condensed; C) at least one step of purification of said stream (M) is performed to obtain a stream enriched in methyl mercaptan; D) the gaseous vents resulting from said at least one purification step are recovered, said gaseous vents comprising at least one sulfur compound, preferably H2S; E) a gas-liquid extraction of said at least one sulfur compound, preferably H2S, is performed with liquid methanol so as to obtain a liquid methanol enriched in sulfur compound(s), preferably in H2S; and F) optionally, said enriched methanol is used as reagent for the reaction of step A).

Abstract: The present invention relates to a process for synthesizing a functionalized mercaptan, comprising the reaction between a compound of formula R2—X—C*H(NR1R7)—(CH2)n-G (II) and H2S in the presence of at least one enzyme chosen from sulfhydrylases; said reaction being performed in a reactor with a partial pressure of H2S in the gas headspace of said reactor of between 0.01 and 4 bar, preferably between 0.1 and 3 bar, for example between 0.1 and 2.5 bar, and more preferentially between 0.25 and 2 bar, at the reaction temperature.

Abstract: The present invention relates to a process for synthesizing functionalized mercaptans essentially in the absence of oxygen, and also to a composition making it possible in particular to implement this process.

Abstract: A process for preparing an S,S?-dialkyldithiocarbonate from a dialkyl disulfide and from a particular metal catalyst, in the presence of carbon monoxide is described in addition to the use of S,S?-dialkyldithiocarbonates as reagents for the preparation of polycarbonates, compounds containing at least one urea and/or isocyanate function and compounds containing at least one thioalkyl function.

Abstract: Chemoenzymatic process for coproducing a disulfide and a sulfoxide or a sulfone The present invention relates to a chemoenzymatic process for coproducing disulfide and sulfoxide or sulfone from a composition M comprising: 1) a sulfide, 2) optionally an oxidizing agent, 3) an organic compound bearing at least one thiol group, 4) an enzyme E catalyzing the oxidation of said sulfide to sulfoxide or to sulfone, 5) an enzyme D catalyzing the formation of a disulfide bridge between two equivalents of said organic compound bearing at least one thiol group to form a dimer, and 6) a cofactor common to the two enzymes E and D; and also to a composition enabling especially the implementation of this process. The present invention also relates to the use of a mercaptan for reducing a disulfide bridge formed between two equivalents of an organic compound bearing at least one thiol group, and more particularly to the use thereof as regeneration substrate of the process described above.

Abstract: Provided is process for the synthesis of at least one functionalized organic polysulfide.

Abstract: Provided is a process for synthesizing a functionalized cyclic dithiocarbamate.

Abstract: The invention relates to a process for preparing methyl mercaptan from a mixture of carbon oxide, hydrogen sulfide and hydrogen, in the presence of a catalyst based on molybdenum and potassium supported on zirconia, said catalyst not comprising any promoter.

Abstract: Provided is process for the synthesis of at least one functionalized organic polysulfide.

Abstract: The present invention relates to a selective process for preparing sulfones from sulfides by enzymatic catalysis, and to a composition comprising a symmetrical sulfide, an oxidoreductase enzyme catalyzing the oxidation of said symmetrical sulfide to symmetrical sulfone; optionally at least one cofactor C of said enzyme E; and an oxidant, which allows in particular the implementation of said process.

Abstract: Provided is an enzymatic process for preparing mercaptans from disulfides.

Abstract: The invention relates to a process for the co-production of alkyl mercaptan and of dialkyl disulfide, comprising the following successive steps: a) reaction of a C1-C4 alcohol in the presence of hydrogen sulfide (H2S) to form a stream (M) comprising an alkyl mercaptan, water, and possibly unreacted hydrogen sulfide, b) purification of the stream (M) to obtain a stream (N) enriched in alkyl mercaptan, c) recovery of a first portion of the stream (N) including the alkyl mercaptan purified in step b), d) oxidation with sulfur of the second portion of the stream (N) of alkyl mercaptan, to form a stream (O) comprising a dialkyl disulfide, hydrogen sulfide, and possibly unreacted alkyl mercaptan, e) purification of the stream (O) to separate, on the one hand, the enriched dialkyl disulfide and, on the other hand, the hydrogen sulfide and possibly the alkyl mercaptan that has not reacted in step d), f) recycling of the hydrogen sulfide and possibly of the alkyl mercaptan isolated in step e) into the stream (M) ob

Abstract: 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 (H2S) 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 (Muncond), c) optional recycling of the stream of uncondensable compounds (Muncond) 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 hydr

Abstract: Provided is an enzymatic process for preparing mercaptans from disulfides.

Abstract: The present invention relates to a selective process for preparing sulfoxides from sulfides by enzymatic catalysis, and to a composition comprising a symmetrical sulfide, an oxidoreductase enzyme catalyzing the oxidation of said symmetrical sulfide to symmetrical sulfoxide; optionally at least one cofactor C of said enzyme E; and an oxidant, which allows in particular the implementation of said process.

Abstract: The present invention relates to a method for preparing methyl mercaptan, in batches or continuously, preferably continuously, said method including at least the following steps: a) reacting at least one hydrocarbon feedstock in the presence of hydrogen sulphide (H2S) and optionally sulphur (S) such as to form carbon disulphide (CS2) and hydrogen (H2); b) reacting said carbon disulphide (CS2) by hydrogenation in the presence of said hydrogen (H2) obtained in step a) such as to form methyl mercaptan (CH3SH), hydrogen sulphide (H2S) and possibly hydrogen (H2); c) optionally recirculating said hydrogen sulphide (H2S) formed during step b) to step a); and d) recovering the methyl mercaptan.