Stable polysulfides and process therefor
AssigneePhillips Petroleum Company
InventorJames E. Shaw
Life of this patent
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Abstract
A process for preparing a stable polysulfide compound, synthesized by reacting a mercaptan with elemental sulfur in the presence of a basic catalyst, having reduced mercaptan sulfur content is provided which comprises contacting the crude polysulfide with an alkylene oxide in the presence of a tetraalkylammonium hydroxide or a basic inorganic catalyst in a solvent.
Claims31
A process for stabilizing and deodorizing a polysulfide comprising contacting said polysulfide with an alkylene oxide in the presence of a basic catalyst in a solvent wherein said basic catalyst is selected from the group consisting of a tetraalkylammonium hydroxide and an inorganic base and said process is carried out at a temperature in the range of from about 50.degree. C. to about 150.degree. C.
A process for stabilizing and deodorizing a polysulfide comprising contacting said polysulfide with an alkylene oxide in the presence of a basic inorganic catalyst in a solvent wherein:
- said polysulfide is a dialkyl polysulfide selected from the group consisting of di-t-nonyl polysulfide and di-t-dodecyl polysulfide;
- said alkylene oxide is selected from the group consisting of ethylene oxide, propylene oxide, 1,2-butylene oxide, 1,3-butylene oxide, isobutylene oxide, and mixtures thereof;
- and is present in the range of, in terms of molar ratio of said alkylene oxide to said polysulfide, from about 0.001:1 to about 50:1;
- said basic inorganic catalyst is selected from the group consisting of LiOH, NaOH, KOH, Ca(OH).sub.2, Mg(OH).sub.2, Na.sub.2 O, MgO, CaO, NaHCO.sub.3, Na.sub.2 CO.sub.3, CaCO.sub.3, calcium phenoxide, barium phenoxide, R"ONa, R"SNa, R"O(CH.sub.2 CH.sub.2 O)mNa, R"O(CH.sub.2 CH.sub.2 O)mNa, and mixtures thereof;
- wherein R" is a C.sub.1 -C.sub.6 alkyl radical and m is an integer between 1 and 15;
- and said basic inorganic catalyst is present in the range of, in terms of molar ratio of said basic inorganic catalyst to said polysulfide, from about 0.001:1 to about 2:1;
- said solvent is selected from water, methanol, ethanol, propanol, tetrahydrofuran, and mixtures thereof;
- and said solvent is present in the range of, in terms of molar ratio of said solvent to said polysulfide, from about 0.001:1 to about 20:1;
- and
- said contacting is carried out at about 50.degree.-150.degree. C. for from about 10 minutes to about 10 hours.
A process for stabilizing and deodorizing a polysulfide comprising contacting said polysulfide with an alkylene oxide in the presence of a basic catalyst in a solvent wherein:
- said polysulfide is a dialkyl polysulfide selected from the group consisting of di-t-nonyl polysulfide and di-t-dodecyl polysulfide;
- said alkylene oxide is selected from the group consisting of ethylene oxide, propylene oxide, 1,2-butylene oxide, 1,3-butylene oxide, isobutylene oxide, and mixtures thereof;
- and is present in the range of, in terms of molar ratio of said alkylene oxide to said polysulfide, from about 0.001:1 to about 50:1;
- said basic catalyst is selected from the group consisting of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, and mixtures thereof;
- and said basic catalyst is present in the range of, in terms of molar ratio of said basic catalyst to said polysulfide, from about 0.001:1 to about 2:1;
- said solvent is selected from water, methanol, ethanol, propanol, tetrahydrofuran, and mixtures thereof;
- and said solvent is present in the range of, in terms of molar ratio of said solvent to said polysulfide, from about 0.001:1 to about 20:1;
- and
- said contacting is carried out at about 50.degree.-150.degree. C. for from about 10 minutes to about 10 hours.
Dependencies are inferred from the claim text.