Patents by Inventor John H. Sinfelt

John H. Sinfelt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6733572
    Abstract: The present invention is a process for separating propylene and dimethylether from a mixture comprising propylene, dimethylether, and propane. The mixture is passed through a bed of an adsorbent comprising a porous crystalline material having (i) diffusion time constants for dimethylether and propylene of at least 0.1 sec−1, and (ii) a diffusion time constant for propane of than 0.02 of the diffusion time constants for dimethylether and propylene. The bed preferentially adsorbs propylene and dimethylether from the mixture. The adsorbed propylene and dimethylether are then desorbed from the bed.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: May 11, 2004
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Sebastian C. Reyes, Krishnan V. Venkatesan, Gregory J. DeMartin, John H. Sinfelt, Karl G. Strohmaier, Jose Guadalupe Santiesteban
  • Patent number: 6730142
    Abstract: In a process for separating propylene from a mixture comprising propylene and propane, the mixture is passed through a bed of an adsorbent comprising a porous crystalline material having (i) a diffusion time constant for propylene of at least 0.1 sec−1, when measured at a temperature of 373° K and a propylene partial pressure of 8 kPa, and (ii) a diffusion time constant for propane, when measured at a temperature of 373° K and a propane partial pressure of 8 kPa, less than 0.02 of said diffusion time constant for propylene. The bed preferentially adsorbs propylene from the mixture. The adsorbed propylene is then desorbed from the bed either by lowering the pressure or raising the temperature of the bed.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: May 4, 2004
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Sebastian C. Reyes, Venkatesan V. Krishnan, Gregory J. DeMartin, John H. Sinfelt, Karl G. Strohmaier, Jose G. Santiesteban
  • Publication number: 20040020360
    Abstract: In a process for separating propylene and dimethylether from a mixture comprising propylene, dimethylether, and propane, the mixture is passed through a bed of an adsorbent comprising a porous crystalline material having (i) diffusion time constants for dimethylether and propylene of at least 0.1 sec−1, when measured at a temperature of 373° K and dimethylether and propylene partial pressures of 8 kPa, and (ii) a diffusion time constant for propane, when measured at a temperature of 373° K and a propane partial pressure of 8 kPa, less than 0.02 of said diffusion time constants for dimethylether and propylene. The bed preferentially adsorbs propylene and dimethylether from the mixture. The adsorbed propylene and dimethylether are then desorbed from the bed either by lowering the pressure or raising the temperature of the bed.
    Type: Application
    Filed: July 30, 2002
    Publication date: February 5, 2004
    Inventors: Sebastian C. Reyes, Krishnan V. Venkatesan, Gregory J. DeMartin, John H. Sinfelt, Karl G. Strohmaier, Jose Guadalupe Santiesteban
  • Publication number: 20030177903
    Abstract: In a process for separating propylene from a mixture comprising propylene and propane, the mixture is passed through a bed of an adsorbent comprising a porous crystalline material having (i) a diffusion time constant for propylene of at least 0.1 sec−1, when measured at a temperature of 373° K and a propylene partial pressure of 8 kPa, and (ii) a diffusion time constant for propane, when measured at a temperature of 373° K and a propane partial pressure of 8 kPa, less than 0.02 of said diffusion time constant for propylene. The bed preferentially adsorbs propylene from the mixture. The adsorbed propylene is then desorbed from the bed either by lowering the pressure or raising the temperature of the bed.
    Type: Application
    Filed: March 19, 2002
    Publication date: September 25, 2003
    Inventors: Sebastian C. Reyes, Venkatesan V. Krishnan, Gregory J. DeMartin, John H. Sinfelt, Karl G. Strohmaier, Jose G. Santiesteban
  • Patent number: 4263173
    Abstract: Supported coprecipitated nickel-cobalt-silica and nickel-cobalt-copper-silica hydrogenation catalysts are disclosed. The catalysts are prepared by preparing an aqueous reaction mixture containing nickel and cobalt cations (and optionally copper cations), silicate anions and solid porous carrier particles under agitation to form a coprecipitate of the nickel, cobalt (and optionally copper) and silicate ions onto said solid porous support particles; heating the aqueous reaction mixture; and adding an alkaline precipitating agent to further precipitate the nickel, cobalt (and optionally copper) and silicate anions onto said solid porous carrier particles.
    Type: Grant
    Filed: January 2, 1979
    Date of Patent: April 21, 1981
    Assignee: Exxon Research & Engineering Co.
    Inventors: James L. Carter, Allan E. Barnett, John H. Sinfelt
  • Patent number: 4263225
    Abstract: Supported coprecipitated nickel-cobalt-silica and nickel-cobalt-copper-silica hydrogenation catalysts are disclosed. The catalysts are prepared by preparing an aqueous reaction mixture containing nickel and cobalt cations (and optionally copper cations), silicate anions and solid porous carrier particles under agitation to form a coprecipitate of the nickel, cobalt (and optionally copper) and silicate ions onto said solid porous support particles; heating the aqueous reaction mixture; and adding an alkaline precipitating agent to further precipitate the nickel, cobalt (and optionally copper) and silicate anions onto said solid porous carrier particles.
    Type: Grant
    Filed: September 19, 1979
    Date of Patent: April 21, 1981
    Assignee: Exxon Research & Engineering Co.
    Inventors: James L. Carter, Allan E. Barnett, John H. Sinfelt
  • Patent number: 4246140
    Abstract: Supported coprecipitated nickel-cobalt-silica and nickel-cobalt-copper-silica hydrogenation catalysts are disclosed. The catalysts are prepared by preparing an aqueous reaction mixture containing nickel and cobalt cations (and optionally copper cations), silicate anions and solid porous carrier particles under agitation to form a coprecipitate of the nickel, cobalt (and optionally copper) and silicate ions onto said solid porous support particles; heating the aqueous reaction mixture; and adding an alkaline precipitating agent to further precipitate the nickel, cobalt (and optionally copper) and silicate anions onto said solid porous carrier particles.
    Type: Grant
    Filed: January 2, 1979
    Date of Patent: January 20, 1981
    Assignee: Exxon Research & Engineering Co.
    Inventors: James L. Carter, Allan E. Barnett, John H. Sinfelt
  • Patent number: 4220520
    Abstract: A startup method for a catalytic reforming process wherein the catalyst is maintained in a bed is provided in which a catalyst comprising an iridium component and at least one additional metal component such as a platinum group metal component is reduced, sulfided and contacted with hydrogen at specified conditions whereby the sulfur is distributed uniformly throughout the catalyst bed prior to contacting the catalyst with the hydrocarbon feed.
    Type: Grant
    Filed: November 16, 1978
    Date of Patent: September 2, 1980
    Assignee: Exxon Research & Engineering Co.
    Inventors: James L. Carter, John H. Sinfelt
  • Patent number: 4088603
    Abstract: The instant invention pertains to a process for activating a reducing catalyst comprising the steps: (a) reducing said catalyst by heating the catalyst in the presence of hydrogen at a temperature sufficient to partially active catalyst; (b) contacting said partially active catalyst in the presence of hydrogen with a reactant feed which undergoes an exothermic reaction in the presence of said partially activated catalyst at conditions whereby said reaction occurs, said conditions including a temperature at least greater than the temperature at which the catalyst is partially activated; and (c) continuing said contacting for a time sufficient to convert said partially activated catalyst to a high activity catalyst. The catalyst is preferably a massive nickel catalyst comprised of nickel and silica, and more preferably comprised of nickel, copper and silica, and capable of having a reduced nickel surface area ranging from 55 to 100 m.sup.2 /g and a B.E.T. total surface area ranging from 150 to 300 m.sup.2 /g.
    Type: Grant
    Filed: June 7, 1977
    Date of Patent: May 9, 1978
    Assignee: Exxon Research & Engineering Co.
    Inventors: James L. Carter, John H. Sinfelt
  • Patent number: 4018670
    Abstract: Hydrocarbon materials are converted to useful products by contacting the same at elevated temperatures with a catalyst comprising a refractory support in association with greater than 0.1 wt. % iridium, and 0.1 - 1.0 wt. % of at least one additional metal. The iridium and additional catalyst metal, preferably platinum, are present on the surface of the support preferably as highly dispersed polymetallic clusters with metal surface areas of at least 200 square meters per gram of metal. The catalyst is particularly effective for promoting naphtha reforming operations.
    Type: Grant
    Filed: July 30, 1974
    Date of Patent: April 19, 1977
    Assignee: Exxon Research and Engineering Company
    Inventors: John H. Sinfelt, Allan E. Barnett
  • Patent number: 3989674
    Abstract: In the partial oxidation of olefinic hydrocarbons directly to their corresponding unsaturated carbonyl compounds, a significant increase in selectivity to the unsaturated carbonyl compounds is obtained by reacting an olefinic compound with oxygen in the presence of a novel bimetallic catalyst system comprising a combination of gold and copper.
    Type: Grant
    Filed: March 26, 1969
    Date of Patent: November 2, 1976
    Assignee: Exxon Research and Engineering Company
    Inventors: John H. Sinfelt, Allan E. Barnett
  • Patent number: 3953368
    Abstract: Compositions comprising iridium and at least one additional metal, preferably platinum, are disclosed in which the iridium and the additional metal or metals are present on a refractory support as highly dispersed polymetallic clusters. The metallic atoms in a cluster are separated by distances of about 2.5 to 4.0A. The degree of coverage of the surface of said refractory support by said polymetallic clusters is lower than about 10% and frequently lower than about 1%. The compositions are useful as hydrocarbon conversion catalysts, and iridiumplatinum catalysts containing a halogen moiety are especially useful for promoting naphtha reforming reactions.
    Type: Grant
    Filed: July 30, 1974
    Date of Patent: April 27, 1976
    Assignee: Exxon Research and Engineering Co.
    Inventor: John H. Sinfelt
  • Patent number: 3939062
    Abstract: Supported iridium-containing hydrocarbon conversion catalysts which are at least partially deactivated due to the deposition of carbonaceous residues thereon during contact with hydrocarbons are regenerated by contacting the catalyst, prior to contact with oxygen at elevated temperature, with a chlorine-containing reagent to increase the catalyst chlorine content to at least 1.0 wt. %, based on anhydrous catalyst, and thereafter contacting the catalyst with a gaseous mixture containing oxygen, a chlorine containing reagent, and water at a temperature of about 750.degree. to 1000.degree.F. for a time sufficient to burn at least a portion of the carbonaceous residues from the catalyst.
    Type: Grant
    Filed: August 16, 1973
    Date of Patent: February 17, 1976
    Assignee: Exxon Research and Engineering Company
    Inventors: John H. Sinfelt, James L. Carter