A novel Low Free 2-MercaptoEthanol Ester has been used to prepare Alkyl Tin Reverse Ester Stabilizers as well as used to enhance the thermal performance of those Alkyl Tin Reverse Ester Stabilizers or Alkyl Tin Thioglycolate Stabilizers or Alkyl Tin Mercaptides for PVC applications where odor during PVC compounding, processing, or of the final PVC article has prevented widespread use of Alkyl Tin Reverse Ester Stabilizers.

The present invention generally relates to the manufacture of methyl mercaptan using recycled dimethyl sulfide. In particular, the invention relates to a process for the continuous production of methyl mercaptan via the catalytic conversion of dimethyl sulfide using a non-promoted Al.sub.2O.sub.3 catalyst at low temperatures.

The present invention generally relates to the manufacture of methyl mercaptan using recycled dimethyl sulfide. In particular, the invention relates to a process for the continuous production of methyl mercaptan via the catalytic conversion of dimethyl sulfide using a non-promoted Al.sub.2O.sub.3 catalyst at low temperatures.

The present invention relates to a method for preparing dimethyl disulphide, 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 (H.sub.2S) and optionally sulphur (S) such as to form carbon disulphide (CS.sub.2) and hydrogen (H.sub.2); b) reacting said carbon disulphide (CS.sub.2) by hydrogenation in the presence of said hydrogen (H.sub.2) obtained in step a), such as to form methyl mercaptan (CH.sub.3SH), hydrogen sulphide (H.sub.2S) and optionally hydrogen (H.sub.2); c) optionally, but preferably, recirculating said hydrogen sulphide (H.sub.2S) formed in step b) to step a); d) reacting the methyl mercaptan formed in step b) with sulphur such as to form dimethyl disulphide and hydrogen sulphide; e) optionally recirculating the hydrogen sulphide formed during step d) to step a); and f) recovering the dimethyl disulphide.

The present invention relates to a method for preparing dimethyl disulphide, 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 (H.sub.2S) and optionally sulphur (S) such as to form carbon disulphide (CS.sub.2) and hydrogen (H.sub.2); b) reacting said carbon disulphide (CS.sub.2) by hydrogenation in the presence of said hydrogen (H.sub.2) obtained in step a), such as to form methyl mercaptan (CH.sub.3SH), hydrogen sulphide (H.sub.2S) and optionally hydrogen (H.sub.2); c) optionally, but preferably, recirculating said hydrogen sulphide (H.sub.2S) formed in step b) to step a); d) reacting the methyl mercaptan formed in step b) with sulphur such as to form dimethyl disulphide and hydrogen sulphide; e) optionally recirculating the hydrogen sulphide formed during step d) to step a); and f) recovering the dimethyl disulphide.

The present invention relates to a novel polyol or polythiol having three or more functional groups, a preparation method there for, and an optical body manufactured therefrom. Especially, the present invention relates to a poly(thio)urethane-based resin and an optical body, such as lenses, manufactured using the resin, wherein the poly(thio)urethane-based resin is prepared by obtaining a novel polyol and then combining a polythiol, which is prepared from the obtained polyol, with a polyiso(thio)cyanate.

The present invention relates to a novel polyol or polythiol having three or more functional groups, a preparation method there for, and an optical body manufactured therefrom. Especially, the present invention relates to a poly(thio)urethane-based resin and an optical body, such as lenses, manufactured using the resin, wherein the poly(thio)urethane-based resin is prepared by obtaining a novel polyol and then combining a polythiol, which is prepared from the obtained polyol, with a polyiso(thio)cyanate.

The present invention discloses processes for producing methyl ethyl sulfide by contacting dimethyl sulfide and diethyl sulfide in the presence of a suitable catalyst. Methyl ethyl sulfide can be used as an odorant in natural gas. Integrated mercaptan and sulfide manufacturing systems and integrated methods for making mercaptans and sulfides also are disclosed.

The present invention discloses processes for producing methyl ethyl sulfide by contacting dimethyl sulfide and diethyl sulfide in the presence of a suitable catalyst. Methyl ethyl sulfide can be used as an odorant in natural gas. Integrated mercaptan and sulfide manufacturing systems and integrated methods for making mercaptans and sulfides also are disclosed.

Provided is a process for preparing polythiols by preparing a sulfhydration reaction medium, simultaneously carrying out radical sulfhydration reaction of at least one polyene and acid-catalyzed sulfhydration reaction of the polyene and recovering a mixture including at least two polythiols. Also provided is a mixture of polythiols obtained from the process described herein.