Preparing By Reacting Hydrogen Sulfide Or A Metal Hydrosulfide Patents (Class 568/70)
  • Patent number: 10513492
    Abstract: Disclosed herein are systems and processes involving the catalyzed cleavage reaction of dimethyl sulfide to methyl mercaptan. The catalyzed cleavage reaction can be a standalone system or process, or can be integrated with a methyl mercaptan production plant.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: December 24, 2019
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Reza Khankal, Henry Hwu, Daniel M. Hasenberg, Christina M. Barry, Mitchell D. Refvik, Michael S. Hankinson
  • Patent number: 10399070
    Abstract: The invention relates to a catalyst comprising a support based on alumina or silica or silica-alumina, at least one element of group VIII, at least one element of group VIB and at least one additive selected from ?-valerolactone, 4-hydroxyvaleric acid, 2-pentenoic acid, 3-pentenoic acid or 4-pentenoic acid. The invention also relates to the process for the preparation of said catalyst and the use thereof in a hydrotreatment and/or hydrocracking process.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: September 3, 2019
    Assignee: IFP Energies nouvelles
    Inventor: Pierre-Louis Carrette
  • Patent number: 10273204
    Abstract: Disclosed herein are systems and processes involving the catalyzed cleavage reaction of dimethyl sulfide to methyl mercaptan. The catalyzed cleavage reaction can be a standalone system or process, or can be integrated with a methyl mercaptan production plant.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: April 30, 2019
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Reza Khankal, Henry Hwu, Daniel M. Hasenberg, Christina M. Barry, Mitchell D. Refvik, Michael S. Hankinson
  • Patent number: 8440736
    Abstract: The present invention provides modified multifunctional thiol-ene monomers wherein one or more thiols are reacted with a Michael addition reactive double bond compound. The present invention further discloses photocurable thiol-ene formulations comprising thiol-ene monomers including the modified multifunctional thiols. The present invention further discloses photocurable thiol-ene formulations comprising thiol-ene monomers and Michael addition reactive double bond molecules and a Michael catalyst. The formulations of the present invention can be photocured to make films or coatings. In a further disclosure, the formulations, including those comprised of unmodified multifunctional thiols and multifunctional enes, are photocured to form films applied to non-flexible or flexible polymer or non-polymer substrates suitable for food packaging, electronic products, optical products and other applications and free-standing films.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: May 14, 2013
    Assignee: University of Southern Mississippi
    Inventors: Charles E. Hoyle, Sergei Nazarenko, Huanyu Wei
  • Publication number: 20110263894
    Abstract: A process for compressing a hydrogen-sulfide-comprising gas stream, which comprises (i) compressing the hydrogen-sulfide-comprising gas stream in a compressor, (ii) flushing the compressor with a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine; a process for producing sulfur compounds, selected from the group consisting of alkylmercaptans, dialkyl disulfides and alkanesulfonic acids, which comprises the conversion of hydrogen-sulfide-comprising gas streams, wherein the hydrogen-sulfide-comprising gas streams are compressed according to the process comprising steps i) and ii); and also the use of a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine for removing sulfur deposits which occur in the compression of hydrogen-sulfide-comprising gas streams.
    Type: Application
    Filed: December 22, 2009
    Publication date: October 27, 2011
    Applicant: BASF SE
    Inventors: Andreas Woelfert, Frank Grzonkowski, Harald Jachow, Guenter Renz
  • Patent number: 8008530
    Abstract: The present invention relates to a process for continuously preparing methyl mercaptan from hydrogen sulphide and methanol in a direct connection with the preparation of hydrogen sulphide.
    Type: Grant
    Filed: August 22, 2006
    Date of Patent: August 30, 2011
    Assignee: Evonik Degussa GmbH
    Inventors: Hubert Redlingshöfer, Stephan Kretz, Caspar-Heinrich Finkeldei, Christoph Weckbecker, Wolfgang Böck, Klaus Huthmacher
  • Patent number: 7994366
    Abstract: Provided is a process for continuously preparing methyl mercaptan by reacting a reactant mixture comprising solid, liquid and/or gaseous carbon- and/or hydrogen-containing compounds with air or oxygen, and/or water and sulfur.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: August 9, 2011
    Assignee: Evonik Degussa GmbH
    Inventors: Jan-Olaf Barth, Hubert Redlingshoefer, Caspar-Heinrich Finkeldei, Christoph Weckbecker, Klaus Huthmacher
  • Publication number: 20110015443
    Abstract: The invention relates to a process for continuously preparing methyl mercaptan by reacting a mixture comprising carbon compounds with sulfur and hydrogen, wherein the carbon disulfide and hydrogen sulfide compounds which form are subsequently converted to methyl mercaptan.
    Type: Application
    Filed: July 15, 2010
    Publication date: January 20, 2011
    Applicant: Evonik Degussa GmbH
    Inventors: Jan-Olaf Barth, Christoph Weckbecker, Hubert Redlingshöefer, Johannes A. Lercher, Christoph Kaufmann
  • Publication number: 20100286448
    Abstract: This invention is related to a preparation method of a supported catalyst Mo—O—K-MexOy for the synthesis of methanethiol from H2S-containing syngas. The catalyst comprises of an active component of Mo—O—K-based species, an active promoter and a support denoted as metal (or metals)-carrier. The support is prepared by electroless plating method in such a way that the metal or metals chosen are plated onto the surface of the carrier. Transition metal, especially Fe, Co or Ni are selected to be the plating metal, while SiO2, Al2O3 or TiO2 are selected to be carrier. The catalyst thus prepared is found to be efficient for the synthesis of methanethiol from H2S-containing syngasor carbon oxides/hydrogen mixtures, especially regarding a minor formation of the by-product CO2.
    Type: Application
    Filed: November 28, 2008
    Publication date: November 11, 2010
    Applicant: EVONIK DEGUSSA GMBH
    Inventors: Yiquan Yang, Yingjuan Hao, Aiping Chen, Qi Wang, Lingmei Yang, Qiaoling Li, Shenjun Dai, Weiping Fang, Jan-Olaf Barth, Christoph Wecbecker, Klaus Hutmacher
  • Publication number: 20100094059
    Abstract: A method is described to prepare a Mo containing supported catalyst comprising TeO2 as active promoter and a process for preparing methanethiol in the presence of said catalyst.
    Type: Application
    Filed: May 25, 2007
    Publication date: April 15, 2010
    Inventors: Yiquan Yang, Aiping Chen, Qi Wang, Jan-Olaf Barth, Christoph Weckbecker, Klaus Huthmacher
  • Patent number: 7576243
    Abstract: A process for continuously preparing methyl mercaptan by reacting a reactant mixture which contains a dialkyl sulphide and a dialkyl polysulphide with hydrogen sulphide to give methyl mercaptan.
    Type: Grant
    Filed: February 6, 2008
    Date of Patent: August 18, 2009
    Assignee: Evonik Degussa GmbH
    Inventors: Jan-Olaf Barth, Hubert Redlingshöfer, Christoph Weckbecker, Klaus Huthmacher
  • Patent number: 7569731
    Abstract: The present invention refers to a continuous process for the manufacture of methyl mercaptan using Mo—O—K-based catalysts. It is further described that the total selectivity of methylmercaptan can be increased by at least 1% by lowering the total gas hourly space velocity. The invention further refers to a process for the preparation of a solid, preformed catalyst system.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: August 4, 2009
    Assignee: Degussa AG
    Inventors: Yiquan Yang, Qi Wang, Renchun Lin, Hongbin Zhang, Youzhu Yuan, Weiping Fang, Quanxing Zheng, Shenjun Dai, Xingguo Yan, Aiping Chen, Jan-Olaf Barth, Christoph Weckbecker, Klaus Huthmacher, Hubert Redlingshöfer, Sabine Ackermann
  • Publication number: 20080293974
    Abstract: Provided is a process for continuously preparing methyl mercaptan by reacting a reactant mixture comprising solid, liquid and/or gaseous carbon- and/or hydrogen-containing compounds with air or oxygen, and/or water and sulfur.
    Type: Application
    Filed: May 23, 2008
    Publication date: November 27, 2008
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Jan-Olaf BARTH, Hubert Redlingshoefer, Caspar-Heinrich Finkeldei, Christoph Weckbecker, Klaus Huthmacher
  • Publication number: 20080262270
    Abstract: The present invention refers to a catalyst for the manufacture of methyl mercaptan from carbon oxides comprising Mo and K compounds and oxides or sulfides of metals chosen from the manganese group. The improvement of the present process consists of the fact that carbon dioxide can be converted with higher conversions and selectivities to methyl mercaptan as compared to state-of-the-art technologies, with only minor amounts of carbon monoxide being formed as side product. Simultaneously, carbon monoxide can be easily converted into carbon dioxide and hydrogen by reaction with water using established water-gas-shift-technologies thus increasing the overall selectivity to methyl mercaptan.
    Type: Application
    Filed: April 14, 2008
    Publication date: October 23, 2008
    Inventors: Jan-Olaf Barth, Hubert Redlingshofer, Christoph Weckbecker, Klaus Huthmacher, Horst-Werner Zanthoff, Ralf Mayer
  • Publication number: 20080200730
    Abstract: A process for continuously preparing methyl mercaptan by reacting a reactant mixture which contains a dialkyl sulphide and a dialkyl polysulphide with hydrogen sulphide to give methyl mercaptan.
    Type: Application
    Filed: February 6, 2008
    Publication date: August 21, 2008
    Inventors: Jan-Olaf BARTH, Hubert Redlingshofer, Christoph Weckbecker, Klaus Huthmacher
  • Patent number: 7365233
    Abstract: A process is provide for the production of methyl mercaptan from synthesis gas and hydrogen sulfide. The process comprises the reaction of carbon monoxide with hydrogen and hydrogen sulfide to produce methyl mercaptan and carbon dioxide. The reaction is carried out in the gas phase over a solid catalyst.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: April 29, 2008
    Inventor: John E. Stauffer
  • Patent number: 7339083
    Abstract: 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.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: March 4, 2008
    Assignee: Arkema France
    Inventors: Georges Fremy, Nadine Essayem, Michel Lacroix, Elodie Zausa
  • Publication number: 20070282131
    Abstract: A process is provide for the production of methyl mercaptan from synthesis gas and hydrogen sulfide. The process comprises the reaction of carbon monoxide with hydrogen and hydrogen sulfide to produce methyl mercaptan and carbon dioxide. The reaction is carried out in the gas phase over a solid catalyst.
    Type: Application
    Filed: May 31, 2006
    Publication date: December 6, 2007
    Inventor: John E. Stauffer
  • Patent number: 7169953
    Abstract: 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 alkylation, hydrosilylation, hydroboration, hydrovinylation, hydroformylation, olefin metathesis, hydrocarboxylation, isomerization, cyclopropanation, Diels-Alder reaction, Heck reaction, isomerization, Aldol reaction, Michael addition; epoxidation, kinetic resolution and [m+n] cycloaddition. Processes for the preparation of the ligands are also described.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: January 30, 2007
    Assignee: The Penn State Research Foundation
    Inventors: Xumu Zhang, Wenjun Tang
  • Patent number: 7105702
    Abstract: 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 alkylation, hydrosilylation, hydroboration, hydrovinylation, hydroformylation, olefin metathesis, hydrocarboxylation, isomerization, cyclopropanation, Diels-Alder reaction, Heck reaction, isomerization, Aldol reaction, Michael addition; epoxidation, kinetic resolution and [m+n] cycloaddition. Processes for the preparation of the ligands are also described.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: September 12, 2006
    Assignee: The Penn State Research Foundation
    Inventors: Xumu Zhang, Wenjun Tang
  • Patent number: 6995288
    Abstract: A method for the production of methyl mercaptan is provided. The method comprises providing raw feed gases consisting of methane and hydrogen sulfide, introducing the raw feed gases into a non-thermal pulsed plasma corona reactor, and reacting the raw feed gases within the non-thermal pulsed plasma corona reactor with the reaction CH4+H2S?CH3SH+H2. An apparatus for the production of methyl mercaptan using a non-thermal pulsed plasma corona reactor is also provided.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: February 7, 2006
    Assignee: University of Wyoming
    Inventors: Rehka Agarwal, legal representative, Temi M. Linjewile, Ashley S. Hull, Zumao Chen, Pradeep K. Agarwal, deceased
  • Publication number: 20040249217
    Abstract: A method for the production of methyl mercaptan is provided. The method comprises providing raw feed gases consisting of methane and hydrogen sulfide, introducing the raw feed gases into a non-thermal pulsed plasma corona reactor, and reacting the raw feed gases within the non-thermal pulsed plasma corona reactor with the reaction CH4+H2S→CH3SH+H2. An apparatus for the production of methyl mercaptan using a non-thermal pulsed plasma corona reactor is also provided.
    Type: Application
    Filed: December 12, 2002
    Publication date: December 9, 2004
    Inventors: Pradeep K. Agarwal, Rehka Agarwal, Temi M. Linjewile, Ashley S. Hull, Zumao Chen
  • Patent number: 6084135
    Abstract: A method wherein a gas stream containing hydrogen, a carbon oxide and hydrogen sulfide is first passed in contact with a catalyst comprising a porous alumina supported sulfided metal selected from the group consisting of molybdenum (Mo), chromium (Cr), tungsten (W), manganese (Mn), nickel (Ni), iron (Fe), zinc (Zn), cobalt (Co), copper (Cu), tin (Sn), vanadium (Va) and mixtures thereof, optionally promoted by an alkali metal sulfide, to convert said hydrogen, carbon oxide and hydrogen sulfide to methyl mercaptans, (primarily methanethiol (CH.sub.3 SH)), and the gas stream containing the methyl mercaptans are passed in contact with a catalyst comprising a supported metal oxide or a bulk metal oxide in the presence of an oxidizing agent and for a time sufficient to convert at least a portion of the methyl mercaptan to formaldehyde (CH.sub.2 O), and sulfur dioxide (SO.sub.2).
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: July 4, 2000
    Assignee: Lehigh University
    Inventor: Israel E. Wachs
  • Patent number: 6028228
    Abstract: A method wherein a sour natural gas stream can be treated to produce formaldehyde from methane and methyl mercaptans, (primarily methanethiol (CH.sub.3 SH) and a small amount of dimethyl sulfide (CH.sub.3 SCH.sub.3)) from hydrogen sulfide, and the methyl mercaptans preferably are passed in contact with a catalyst comprising a supported metal oxide or a bulk metal oxide in the presence of an oxidizing agent and for a time sufficient to convert at least a portion of the methyl mercaptan to formaldehyde (CH.sub.2 O), and sulfur dioxide (SO.sub.2).
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: February 22, 2000
    Assignee: Georgia-Pacific Corporation
    Inventor: Israel E. Wachs
  • Patent number: 5977011
    Abstract: A catalyst for the synthesis of methyl mercaptan from hydrogen sulfide and methanol as well as a process for preparation of the catalyst. The catalyst is an active aluminum oxide onto which 5 to 25% by weight potassium tungstate is deposited as an activator. A two-stage impregnation with intermediate drying produces a catalyst which exhibits distinctly better selectivity for formation of methyl mercaptan than catalysts obtained by single-stage impregnation.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: November 2, 1999
    Assignee: Degussa Huls
    Inventors: Joerg Sauer, Lukas von Hippel, Dietrich Arntz, Wolfgang Boeck
  • Patent number: 5493058
    Abstract: The invention relates to the manufacture of methyl mercaptan by catalytic hydrogenation of dimethyl disulphide on a catalyst based on sulphide(s) of at least one transition metal.The selectivity with respect to methyl mercaptan is considerably improved by working in the presence of water and/or hydrogen sulphide.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: February 20, 1996
    Assignee: Elf Aquitaine Production
    Inventors: Emmanuel Cadot, Michel Lacroix, Annie Commarieu, Emmanuel Arretz
  • Patent number: 5481042
    Abstract: Described are preferred processes which produce methyl mercaptan from methyl bromide and aqueous mediums of metal hydrosulfide. The processes can be used to simultaneously consume methyl bromide byproduct and aqueous NaSH byproduct while producing methyl mercaptan.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: January 2, 1996
    Assignee: Great Lakes Chemical Corp.
    Inventors: John L. Burba, III, James T. Ayres, Preston E. Spires, John E. Hill
  • Patent number: 5453543
    Abstract: Linear C.sub.4 + alkyl mercaptans of high purity are prepared by the reaction of a di-linear(C.sub.4 +) alkyl sulfide with hydrogen sulfide at elevated temperature in the presence of a specified transition alumina material.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: September 26, 1995
    Assignee: Elf Atochem North America, Inc.
    Inventors: Michael D. Gernon, Stanley R. Sandler
  • Patent number: 5283369
    Abstract: A process for producing a novel catalyst wherein an amorphous alumina gel is formed at least on the surface of an aluminum-containing material, the gel is heated to form crystalline .alpha.- or .beta.-alumina trihydrate and the trihydrate is sulfided, the product of said process, and the method of producing mercaptans from alcohols or ethers and hydrogen sulfide at elevated temperature in the presence of said novel catalyst, are disclosed herein.
    Type: Grant
    Filed: March 24, 1992
    Date of Patent: February 1, 1994
    Assignee: Elf Atochem North America, Inc.
    Inventors: Roger T. Clark, James A. Elkins, Jr.
  • Patent number: 5045302
    Abstract: This invention concerns novel bidentate ligands L having two phosphorus or arsenic atoms. Cationic complexes of the ligands with Technetium-99m, e.g. having the formula [TcO.sub.2 L.sub.2 ].sup.+, are useful for body imaging, particularly myocardial imaging. The ligands have the general formulaY.sub.2 QZQY.sub.2where Q is phosphorus orZ is a --CC-- or --CCC-- or --COC-- groups,the four groups Y are all C1-C8 saturated hydrocarbon or fluorohydrocarbon with 1-3 ether oxygen atoms.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: September 3, 1991
    Assignee: Amersham International plc
    Inventors: James D. Kelly, Kwok W. Chiu, Ian A. Latham
  • Patent number: 4943662
    Abstract: The invention relates to the synthesis of dithiols and more particularly that of .alpha.,.omega.-dithiols having 5 to 20 carbon atoms.The process according to the invention comprises reacting a di-(tertiary-alkylthio)alkane with hydrogen sulphide in the presence of a solid acid catalyst. The alkane dithiol is obtained selectively and a tertiary-alkyl mercaptan is obtained as by-product. It is possible to reuse the latter in a cyclical process to produce the original di-(tertiary-alkylthio)alkane.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: July 24, 1990
    Assignee: Societe Nationale Elf Aquitaine (Production)
    Inventor: Emmanuel Arretz
  • Patent number: 4927972
    Abstract: A catalytic process for the production of mercaptans from thioethers, which comprises reacting a thioether, in which the sulfur atom of the thioether function is bonded, on the one hand to a tertiary carbon atom and, on the other hand, to a primary or secondary carbon atom, with hydrogen sulfide in the presence of an appropriate acid catalyst, especially an aluminosilicate or an ion-exchange resin.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: May 22, 1990
    Assignee: Societe Nationale Elf Aquitaine (Production)
    Inventor: Emmanuel F. E. Arretz
  • Patent number: 4668825
    Abstract: Methanethiol is produced from a gaseous feed comprising a mixture of H.sub.2 S and CO by contacting said feed with a catalyst comprising rutile titania at a temperature of at least about 225.degree. C.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: May 26, 1987
    Assignee: Exxon Research and Engineering Co.
    Inventors: Charles T. Ratcliffe, Petrus J. Tromp
  • Patent number: 4665242
    Abstract: In a process for the production of methyl mercaptan by heating a gas comprising carbon monoxide and/or carbon dioxide, hydrogen sulphide and hydrogen in contact with a catalyst based upon a heavy metal sulphide, with recycling of the gas fraction which has not reacted, the gas to be recycled has removed from it water which it contains following the reaction in contact with the catalyst.
    Type: Grant
    Filed: July 9, 1985
    Date of Patent: May 12, 1987
    Assignee: Societe Nationale Elf Aquitaine (Production)
    Inventors: Martine Boulinguiez, Christian Forquy, Joel Barrault
  • Patent number: 4618723
    Abstract: Carbon monoxide and carbon dioxide are upgraded to valuable organic compounds, such as methanol, methane, propylene, and the like, by a thermochemical process comprising:(a) contacting the carbon monoxide and/or carbon dioxide with hydrogen sulfide to form carbonyl sulfide,(b) contacting the carbonyl sulfide with oxygen to form carbon monoxide and sulfur dioxide, and(c) hydrogenating at least one of carbon monoxide and carbonyl sulfide to the desired organic compound.
    Type: Grant
    Filed: December 10, 1982
    Date of Patent: October 21, 1986
    Assignee: The Standard Oil Company
    Inventors: Daniel R. Herrington, Philip L. Kuch
  • Patent number: 4570020
    Abstract: Methanethiol is produced from a gaseous feed comprising a mixture of H.sub.2 S and CO by contacting said feed, at a temperature of at least about 225.degree. C., with a catalyst comprising an oxide of a metal selected from the group consisting of V, Nb, and Ta and mixtures thereof, preferably V, supported on titania and wherein at least a portion, and preferably at least about 25 wt. %, of said supported oxide is in a non-crystalline form.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: February 11, 1986
    Assignee: Exxon Research and Engineering Co.
    Inventors: Charles T. Ratcliffe, Petrus J. Tromp, Israel E. Wachs
  • Patent number: 4449006
    Abstract: A process is provided for the manufacture of methyl mercaptan with substantial reduction of by-product methane by intimate mixture of carbon oxide, sulfur or hydrogen sulfide and hydrogen at elevated temperature and pressure with a single-phase, solid catalyst system comprising a porous alumina-containing support upon which is deposited a mixture of manganese sulfide and alkali metal sulfide.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: May 15, 1984
    Assignee: Pennwalt Corporation
    Inventor: Paul G. Haines
  • Patent number: 4410731
    Abstract: A process is provided for the manufacture of methyl mercaptan by reacting a carbon oxide, hydrogen sulfide and hydrogen in the presence of a catalyst at elevated temperature and pressure; the catalyst is a single-phase, solid material comprising a porous alumina-containing support upon which is deposited a mixture of one or more selected metallic sulfides and an alkali metal sulfide.
    Type: Grant
    Filed: December 23, 1981
    Date of Patent: October 18, 1983
    Assignee: Pennwalt Corporation
    Inventor: Bernard Buchholz
  • Patent number: 4396778
    Abstract: A continuous process is provided for the vapor-phase preparation of C.sub.1 -C.sub.18 alkyl mercaptans where a di C.sub.1 -C.sub.18 alkyl sulfide is reacted with a molar excess of hydrogen sulfide at elevated temperature in the presence of a specified synthetic zeolite containing at least 10 percent by weight of an alkali metal, expressed as Na.sub.2 O.
    Type: Grant
    Filed: December 17, 1981
    Date of Patent: August 2, 1983
    Assignee: Pennwalt Corporation
    Inventor: Robert B. Hager
  • Patent number: 4313006
    Abstract: A process is provided for preparing alkyl mercaptans by reacting a dialkyl sulfide with hydrogen sulfide in the presence of a zeolite catalyst.
    Type: Grant
    Filed: September 3, 1980
    Date of Patent: January 26, 1982
    Assignee: Pennwalt Corporation
    Inventor: Robert B. Hager