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| Number | Title | Issue Date |
| 7339083 | Catalytic method of producing alkyl mercaptans by adding hydrogen sulphide to an olefin The process for preparing a mercaptan from an olefin and hydrogen sulphide is carried out in the presence of hydrogen and a catalyst composition comprising a strong acid, such as a heteropolyacid, and at least one metal belonging to group VIII of the Periodic Table.... | 03/04/2008 |
| 7235697 | Use of H2S-containing offgas streams for preparing sulfur-containing products The present invention relates to a process for preparing sulfur-containing compounds of the general formula I in which Q, R1 and R2 are each independently defined as follows: Q:... | 06/26/2007 |
| 7217843 | Method of making 2-thiols A process for selectively making 2-thiols from alpha olefins is described. The process includes contacting a linear or branched alpha olefin having with H2S in the presence of a catalyst and recovering the 2-thiol from a product mixture. The catalyst incl... | 05/15/2007 |
| 7169953 | P-chiral phospholanes and phosphocyclic compounds and their use in asymmetric catalytic reactions Chiral ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes according to the present invention are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic al... | 01/30/2007 |
| 7105702 | P-chiral phospholanes and phosphocyclic compounds and their use in asymmetric catalytic reactions Chiral ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes according to the present invention are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic al... | 09/12/2006 |
| 5874630 | Synthesis of mercaptans from alcohols Disclosed is a method of making a mercaptan by reacting an aliphatic alcohol with hydrogen sulfide in a continuous gaseous phase reaction. The reaction is performed in the presence of a catalyst which comprises a catalytically active carrier that contains... | 02/23/1999 |
| 5741934 | Preparation of primary mercaptans A process is disclosed for the preparation of primary mercaptans by reacting hydrogen sulfide with an alpha-olefin in the presence of a reaction initiating amount of a borane represented by the formula R2 BH or R3 B where R is a line... | 04/21/1998 |
| 4937385 | Process for the manufacture of dialkyl disulfides and polysulfides A process is disclosed for continuously preparing dialkyl disulfides and dialkyl polysulfides by reacting at elevated temperature and in the presence of a solid, particulate catalyst an alkene and hydrogen sulfide in a first reaction zone, and then passin... | 06/26/1990 |
| 4638093 | Preparation of secondary thiols A process is disclosed for the preparation of secondary thiols by the addition of H2 S to C10 to C30 linear olefins in the presence of certain zeolite catalysts. The process achieves high selectivity to the secondary thiol... | 01/20/1987 |
| 4612398 | Alkyl mercaptan process A process for making alkyl mercaptans in high yield while minimizing the formation of dialkyl sulfides is conducted by reacting an olefin with hydrogen sulfide in an inert solvent (e.g. CH2 Cl2) containing a Lewis Acid catalyst (e.g.... | 09/16/1986 |
| 4568767 | Process for the manufacture of dialkyl sulfides A process is provided for the preparation of dialkyl sulfides by reacting alkenes and hydrogen sulfide at elevated temperature in the presence of a Type X, Y or L zeolite containing from about 5 to 15 percent by weight of alkali metal, expresed as Me... | 02/04/1986 |
| 4565893 | Process of synthesis of mercaptans from olefins and hydrogen sulphide by heterogeneous catalysis Process for the synthesis of a mercaptan from an olefin, by the action of hydrogen sulphide thereon, in the presence of a catalyst comprising a cation exchange resin, characterized in that this resin is dry and that the reaction is effected at a temperatu... | 01/21/1986 |
| 4511753 | Selective removal of vinylidene olefin from olefin mixtures Vinylidene olefins are selectively removed from a mixture of olefins containing vinylidene olefins by reacting the mixture with either hydrogen sulfide or a hydrocarbyl mercaptan and then distilling the resultant mixture to obtain a substantially vinylide... | 04/16/1985 |
| 4102931 | Manufacture of tertiary mercaptans using zeolite catalysts Certain synthetic zeolites have been found to provide high conversion over extended periods when used as catalysts in the addition reaction of hydrogen sulfide with branched, unsymmetrical olefins to produce tertiary mercaptans.... | 07/25/1978 |
| 3963785 | Mercaptans by addition of hydrogen sulfide to olefins in presence of carbon disulfide In a method for preparing mercaptans by the addition of hydrogen sulfide to olefins in the presence of sulfactive catalysts a method is provided for increasing the total conversion of reactants to mercaptans by including carbon disulfide in the reaction m... | 06/15/1976 |
