Patents by Inventor Stephen J. Miller

Stephen J. Miller 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: 7981974
    Abstract: The present disclosure relates to a high molecular weight, monoesterified polyimide polymer. One method as described herein relates to making the high molecular weight, monoesterified polyimide polymer. According to its broadest aspect, the method for making the high molecular weight, monoesterified polyimide polymer comprises the following steps: (a) preparing a polyimide polymer comprising carboxylic acid functional groups from a reaction solution comprising monomers and at least one solvent; and (b) treating the polyimide polymer with a diol at esterification conditions in the presence of dehydrating conditions to form a monoesterified polyimide polymer, wherein the dehydrating conditions at least partially remove water produced during step (b). Such high molecular weight, monoesterified polyimide polymers are useful in forming crosslinked polymer membranes for the separation of fluid mixtures.
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: July 19, 2011
    Assignees: Chevron U.S.A. Inc., Georgia Tech Research Corporation
    Inventors: Stephen J. Miller, Imona C. Omole, William J. Koros
  • Patent number: 7973204
    Abstract: We provide a process for making a base oil, comprising: a) selecting an olefin feed produced by thermal cracking of a waxy feed; b) oligomerizing the olefin feed in an ionic liquid oligomerization zone at a set of oligomerization conditions to form an oligomer; and c) alkylating the oligomer in the presence of an isoparaffin, in an ionic liquid alkylation zone, at a set of alkylation conditions to form an alkylated oligomeric product having a kinematic viscosity at 100° C. of 6.9 mm2/s or greater, a VI of at least 134, and a Bromine Number of less than 4. We provide a process to make base oil from an olefin feed produced in a FCC unit. We also provide a process to make two or more viscosity grades of base oil from an olefin feed produced by thermal cracking of a waxy feed.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: July 5, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Saleh Elomari, Russell R. Krug, Stephen J. Miller
  • Publication number: 20110147268
    Abstract: A process for producing a jet fuel, comprising contacting an olefin and an isoparaffin with an unsupported catalyst system comprising an ionic liquid catalyst and a halide containing additive in an alkylation zone under alkylation conditions to make an alkylate product, and recovering the jet fuel from the alkylate product, wherein the jet fuel has a NMR branching index greater than 60 and meets the boiling point, flash point, smoke point, heat of combustion, and freeze point requirements for Jet A-1 fuel. Also a process for producing a jet fuel, comprising providing a feed produced in a FC cracker comprising olefins, mixing the feed with an isoparaffin, alkylating the mixed feed in an ionic liquid alkylation zone, and separating the jet fuel from the alkylated product.
    Type: Application
    Filed: February 8, 2011
    Publication date: June 23, 2011
    Inventors: Sven Ivar Hommeltoft, Stephen J. Miller, Ajit R. Pradhan
  • Publication number: 20110147269
    Abstract: A process for producing a low volatility gasoline blending component and a middle distillate, comprising alkylating a hydrocarbon stream comprising at least one olefin having from 2 to 4 carbon atoms and at least one paraffin having from 4 to 6 carbon atoms with an ionic liquid catalyst and an unsupported halide containing additive, and separating the alkylate into at least the low volatility gasoline blending component and the middle distillate, wherein the middle distillate is a fuel suitable for use as a jet fuel or jet fuel blending component. Also, a process for producing a gasoline blending component and a middle distillate, comprising adjusting a level of a halide containing additive provided to an ionic liquid alkylation reactor to shift selectivity towards heavier products, and recovering a low volatility gasoline blending component and the middle distillate. Also, processes comprising alkylating isobutane with butene over specific chloroaluminate ionic liquids.
    Type: Application
    Filed: February 25, 2011
    Publication date: June 23, 2011
    Inventors: Sven Ivar Hommeltoft, Stephen J. Miller, Ajit Ramchandra Pradhan
  • Patent number: 7955495
    Abstract: A middle distillate, comprising hydrocarbons having a boiling range between 150° C. and 350° C., a NMR branching index greater than 60, and a CH3/CH2 hydrogen ratio greater than 2.6. Also, there is provided the middle distillate made by a process compressing alkylating an isoparaffin with an olefin under alkylation conditions over an unsupported ionic liquid catalyst, and providing an amount of halide containing additive to the alkylating step to achieve the NMR branching index and the CH3/CH2 hydrogen ratio.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: June 7, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Sven Ivar Hommeltoft, Stephen J. Miller, Ajit Pradhan, Susan M. Abernathy
  • Patent number: 7956204
    Abstract: A process for oxidation of hydrocarbon, comprising contacting said hydrocarbon with hydrogen peroxide in the presence of a catalytically effective amount of crystalline, titanosilicate zeolite TS-1 catalyst for a time and at a temperature effective to oxidize said hydrocarbon, wherein the catalyst is in the form of binderless, shaped particles comprising titanosilicate, TS-1 and titanosilicate TS-1 precursors and having a defined cross sectional diameter. Also, a process for epoxidation of olefins using crystalline, titanosilicate zeolite TS-1 catalyst. Also a process for oxidation of hydrocarbon using crystalline, titanosilicate TS-1 catalyst, wherein the catalyst is in the form of binderless, shaped particles having a crystallite size of less than 0.2 micron and a defined cross sectional diameter.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: June 7, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 7951287
    Abstract: The present invention relates to distillate fuels or distillate fuel blend stocks comprising a blend of a Fischer-Tropsch derived product and a petroleum derived product that is hydrocracked under conditions to preserve aromatics. The resulting distillate fuel product is a low sulfur, moderately aromatic distillate fuel. The resulting distillate fuel or distillate fuel blend stock exhibits excellent properties, including good seal swell, density, and thermal stability. The present invention also relates to processes for making these distillate fuels or distillate fuel blend stocks.
    Type: Grant
    Filed: December 23, 2004
    Date of Patent: May 31, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stephen J. Miller, Dennis J. O'Rear
  • Publication number: 20110094936
    Abstract: A method for improving the lubricating properties of a distillate base oil characterized by a pour point of 0 degrees C. or less and a boiling range having the 10 percent point falling between about 625 degrees F. and about 790 degrees F. and the 90 percent point falling between about 725 degrees F. and about 950 degrees F., the method comprises blending with said distillate base oil a sufficient amount of a pour point depressing base oil blending component to reduce the pour point of the resulting base oil blend at least 3 degrees C. below the pour point of the distillate base oil, wherein the pour point depressing base oil blending component is an isomerized Fischer-Tropsch derived bottoms product having a pour point that is at least 3 degrees C. higher than the pour point of the distillate base oil.
    Type: Application
    Filed: December 13, 2010
    Publication date: April 28, 2011
    Applicant: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 7922892
    Abstract: A method for improving the lubricating properties of a distillate base oil characterized by a pour point of 0 degrees C. or less and a boiling range having the 10 percent point falling between about 625 degrees F. and about 790 degrees F. and the 90 percent point falling between about 725 degrees F. and about 950 degrees F., the method comprises blending with said distillate base oil a sufficient amount of a pour point depressing base oil blending component to reduce the pour point of the resulting base oil blend at least 3 degrees C. below the pour point of the distillate base oil, wherein the pour point depressing base oil blending component is an isomerized Fischer-Tropsch derived bottoms product having a pour point that is at least 3 degrees C. higher than the pour point of the distillate base oil.
    Type: Grant
    Filed: November 21, 2005
    Date of Patent: April 12, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 7923593
    Abstract: A process for producing a middle distillate or a middle distillate blending component, comprising contacting a feed comprising an olefin, an isoparaffin, and less than 5 wt % oligomerized olefin, in an ionic liquid alkylation zone with an acidic haloaluminate ionic liquid, at alkylation conditions; and recovering an effluent comprising an alkylated product that has greater than 35 vol % C10+ and less than 1 vol % C55+. Also processes for producing a middle distillate by alkylating isobutane and butene in the presence of defined chloroaluminate ionic liquid catalysts, wherein a separating step separates the middle distillate and wherein the middle distillate is from 20 wt % or higher of the total alkylate product. Also a process for producing middle distillate with FC cracker feed comprising olefins. A separated middle distillate has greater than 30 vol % C10+, less than 1 vol % C55+, and a cloud point less than ?50° C.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: April 12, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Sven Ivar Hommeltoft, Stephen J. Miller, Ajit Pradhan
  • Patent number: 7919663
    Abstract: A process for producing a low volatility gasoline blending component and a middle distillate, comprising alkylating a hydrocarbon stream comprising at least one olefin having from 2 to 6 carbon atoms and at least one paraffin having from 4 to 6 carbon atoms with an ionic liquid catalyst and an unsupported halide containing additive, and separating the alkylate into at least the low volatility gasoline blending component and the middle distillate, wherein the middle distillate is a fuel suitable for use as a jet fuel or jet fuel blending component. Also, a process for producing a gasoline blending component and a middle distillate, comprising adjusting a level of a halide containing additive provided to an ionic liquid alkylation reactor to shift selectivity towards heavier products, and recovering a low volatility gasoline blending component and the middle distillate. Also, processes comprising alkylating isobutane with butene over specific chloroaluminate ionic liquids.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: April 5, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Sven Ivar Hommeltoft, Stephen J. Miller, Ajit Pradhan
  • Patent number: 7919664
    Abstract: A process for producing a jet fuel, comprising contacting an olefin and an isoparaffin with an unsupported catalyst system comprising an ionic liquid catalyst and a halide containing additive in an alkylation zone under alkylation conditions to make an alkylate product, and recovering the jet fuel from the alkylate product, wherein the jet fuel meets the boiling point, flash point, smoke point, heat of combustion, and freeze point requirements for Jet A-1 fuel. Also a process for producing a jet fuel, comprising providing a feed produced in a FC cracker comprising olefins, mixing the feed with an isoparaffin, alkylating the mixed feed in an ionic liquid alkylation zone, and separating the jet fuel from the alkylated product. We also provide a process comprising alkylating isobutane and butene in the presence of specific chloroaluminate ionic liquid catalysts, to produce a jet fuel.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: April 5, 2011
    Assignee: Chevron U.S.A. Inc.
    Inventors: Sven Ivar Hommeltoft, Stephen J. Miller, Ajit Pradhan
  • Publication number: 20110034748
    Abstract: We provide a process, comprising: a. oligomerizing propylene in ionic liquid; b. optionally alkylating the oligomer; to make a base oil having: i. a kinematic viscosity at 100° C. of 2.9 mm2/s or greater, ii. a viscosity index from 25 to 90, and iii. a low cloud point. We provide a process, comprising: oligomerizing a feed comprising propylene and propane to make a base oil having: i. from 45 to 70 wt % hydrocarbons boiling at 900° F. or higher, ii. a viscosity index from 25 to 90, and iii. a low cloud point. We provide a process, comprising: a. mixing longer chain alpha olefins with propylene; b. oligomerizing the feed, to make a base oil having: i. a kinematic viscosity at 100° C. greater than 10 mm2/s; ii. a viscosity index from 50 to 90; iii. a low pour point; and iv. a low cloud point.
    Type: Application
    Filed: August 10, 2009
    Publication date: February 10, 2011
    Inventors: Saleh Elomari, Stephen J. Miller
  • Publication number: 20110034742
    Abstract: A process, comprising: a. selecting a kinematic viscosity; b. feeding an olefin feed comprising a propylene to an oligomerization zone; c. tuning an oligomerizing step to produce a base oil having the kinematic viscosity and a viscosity index from 20 to 90. A process, comprising: a. selecting a kinematic viscosity that is greater than 20 mm2/s; b. feeding a feed comprising propylene to an oligomerization zone; and c. adding a Brönsted acid to produce a base oil. A process, comprising tuning a step in an oligomerization zone comprising a propylene and an ionic liquid catalyst to produce a base oil having: a. a high kinematic viscosity; b. a viscosity index from 25 to 90; and c. a low pour point. A base oil, comprising oligomerized olefins, wherein the base oil has: a. a high kinematic viscosity; b. a viscosity index from 25 to 90; and c. a low pour point.
    Type: Application
    Filed: August 10, 2009
    Publication date: February 10, 2011
    Inventors: Saleh Elomari, Stephen J. Miller
  • Publication number: 20110034743
    Abstract: We provide a base oil, comprising one or more oligomerized olefins, wherein the base oil has: d. a kinematic viscosity at 100° C. greater than 2.9 mm2/s; d. a viscosity index from 25 to 90; and f. a cloud point less than ?55° C. We provide a base oil made by oligomerizing propylene in an ionic liquid catalyst, where the base oil has a viscosity index from 25 to 90 and the base oil is colorless. We also provide a base oil made by oligomerizing an olefin feed comprising propylene in an acidic alkyl-pyridinium chloroaluminate ionic liquid, wherein the base oil has a viscosity index at 100° C. greater than 2.9 mm2/s, a viscosity index from 25 to 90, and a cloud point less than ?55° C.
    Type: Application
    Filed: August 10, 2009
    Publication date: February 10, 2011
    Inventors: Saleh Elomari, Stephen J. Miller
  • Publication number: 20110020190
    Abstract: The present invention is generally directed to methods and systems for producing biofuels via biomass, waste plastic, and/or Fischer-Tropsch product feeds. Such methods and systems are an improvement over the existing art at least in that they are feed-tolerant (i.e., allow for variability) and provide an economy of scale, while typically retaining the environmental benefits associated with such processing of such feeds.
    Type: Application
    Filed: October 7, 2010
    Publication date: January 27, 2011
    Applicant: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Publication number: 20110008219
    Abstract: A lubricating base oil manufacturing plant comprising a means for hydroisomerization dewaxing a wax at a specified hydrogen to feed ratio and a means for hydrofinishing the hydroisomerized wax to produce one or more base oils having a viscosity index greater than 28×Ln(Kinematic Viscosity at 100° C., in cSt)+95, and a ratio of wt % molecules with monocycloparaffinic functionality to wt % molecules with multicycloparaffinic functionality greater than 15.
    Type: Application
    Filed: September 3, 2010
    Publication date: January 13, 2011
    Inventors: John M. Rosenbaum, Nancy J. Bertrand, Scott Deskin, Kamala Krishna, Stephen J. Miller, Susan M. Abernathy
  • Publication number: 20110004038
    Abstract: We provide a process for making a base oil, comprising: a) selecting an olefin feed produced by thermal cracking of a waxy feed; b) oligomerizing the olefin feed in an ionic liquid oligomerization zone at a set of oligomerization conditions to form an oligomer; and c) alkylating the oligomer in the presence of an isoparaffin, in an ionic liquid alkylation zone, at a set of alkylation conditions to form an alkylated oligomeric product having a kinematic viscosity at 100° C. of 6.9 mm2/s or greater, a VI of at least 134, and a Bromine Number of less than 4. We provide a process to make base oil from an olefin feed produced in a FCC unit. We also provide a process to make two or more viscosity grades of base oil from an olefin feed produced by thermal cracking of a waxy feed.
    Type: Application
    Filed: April 8, 2010
    Publication date: January 6, 2011
    Inventors: Saleh Elomari, Russell R. Krug, Stephen J. Miller
  • Publication number: 20100324316
    Abstract: A method is disclosed for preparing crystalline titanosilicate zeolite TS-1 from a reaction mixture containing only sufficient water to produce zeolite TS-1. In one embodiment, the reaction mixture is self-supporting and may be shaped if desired. In the method, the reaction mixture is heated at crystallization conditions and in the absence of an added external liquid phase, so that excess liquid need not be removed from the crystallized product.
    Type: Application
    Filed: August 26, 2010
    Publication date: December 23, 2010
    Applicant: Chevron U.S.A. Inc.
    Inventor: Stephen J. MILLER
  • Patent number: 7846880
    Abstract: A lubricant, comprising a light base oil fraction having a wt % Noack volatility between 0 and 100 and additionally less than a Noack Volatility Factor (NVF), wherein the Noack Volatility Factor is defined by the equation; 900×(Kinematic Viscosity at 100° C.)?2.8?15, and optionally one or more additional additives. A process to make the light base oil fraction, comprising hydroisomerization dewaxing a waxy feed in a series of two or more reactors, and recovering the light base oil fraction having a low wt % Noack volatility. Also, a light base oil fraction having a wt % Noack volatility between 0 and 100 and additionally less than the NVF, made by the process of hydroisomerization dewaxing a waxy feed in a series of reactors.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: December 7, 2010
    Assignee: Chevron U.S.A. Inc.
    Inventors: John M. Rosenbaum, Nancy J. Bertrand, Scott C. Deskin, Brent K. Lok, Shuibo Xie, Stephen J. Miller