Patents by Inventor Clarence D. Chang

Clarence D. Chang 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).

  • Catalyst and process for the selective production of para-dialkyl substituted benzenes
    Patent number: 5243117
    Abstract: A silicon-modified non-organic zeolite catalyst and a process for the selective production of para-dialkyl substituted benzenes using the silicon-modified non-organic high alumina zeolite.
    Type: Grant
    Filed: June 5, 1990
    Date of Patent: September 7, 1993
    Assignee: Mobil Oil Corp.
    Inventors: Clarence D. Chang, David S. Shihabi
  • Synthetic porous crystalline MCM-49, its synthesis and use
    Patent number: 5236575
    Abstract: This invention relates to a new synthetic porous crystalline material, a method for its preparation and use thereof in catalytic conversion of organic compounds. The new crystalline material exhibits a distinctive X-ray diffraction pattern.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: August 17, 1993
    Assignee: Mobil Oil Corp.
    Inventors: J. Michael Bennett, Clarence D. Chang, Stephen L. Lawton, Michael E. Leonowicz, Daria N. Lissy, Mae K. Rubin
  • Process for hydrogenating alkenes in the presence of alkanes and a heterogeneous catalyst
    Patent number: 5227552
    Abstract: The present invention provides a process for producing a selected paraffin from a reaction mixture containing(i) an acceptor olefin having the carbon backbone structure of said selected paraffin;(ii) a donor paraffin having a carbon backbone structure different from that of said selected paraffin;(iii) less than about 10 mole percent molecular hydrogen; which process comprises the steps of contacting said reaction mixture with a heterogeneous catalyst comprising active carbon in the absence of an added catalytic metal or metal compound to convert at least a portion of said acceptor olefin to said selected paraffin and to dehydrogenate at least a portion of said donor paraffin.
    Type: Grant
    Filed: April 27, 1992
    Date of Patent: July 13, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, Stuart D. Hellring, Randy F. Striebel
  • Synthesis of crystalline mordenite-type material
    Patent number: 5211935
    Abstract: This invention relates to a new form of crystalline material identified as mordenite-type, to a new and useful method for synthesizing said crystalline material and to use of said crystalline material prepared in accordance herewith as a catalyst for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: May 18, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, Stuart D. Hellring, Randy F. Striebel
  • Synthesis of crystalline ZSM-35
    Patent number: 5190736
    Abstract: This invention relates to a new form of crystalline material identified as having the structure of ZSM-35, to a new and useful method for synthesizing said crystalline material using 1,4-diaminocyclohexane as directing agent, and to use of said crystalline material prepared in accordance herewith as a catalyst for organic compound, e.g., hydrocarbon compound, conversion.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: March 2, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Stuart D. Hellring, Clarence D. Chang, John D. Lutner
  • Selective ortho propylation of phenol over large pore zeolite
    Patent number: 5175375
    Abstract: The invention relates to producing ortho isopropyl phenol catalytically by contacting phenol with isopropanol or propylene, at a temperature of from about 200.degree. C. to about 300.degree. C., with ZSM-12 and zeolite Beta; and recovering ortho isopropyl phenol.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: December 29, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, Stuart D. Hellring
  • Synthesis of crystalline ZSM-5-type material
    Patent number: 5174977
    Abstract: This invention relates to a new form of crystalline material identified as zeolite ZSM-5-type, to a new and useful method for synthesizing said crystalline material and to use of said crystalline material prepared in accordance herewith as a catalyst for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: December 29, 1992
    Assignee: Mobil Oil Corp.
    Inventors: Clarence D. Chang, Stuart D. Hellring, Randy F. Striebel
  • Synthesis of a synthetic porous crystalline material
    Patent number: 5173281
    Abstract: There is provided a method for preparing a synthetic crystalline material from a reaction mixture including an organic directing agent selected from 1,4-diazacycloheptane (i.e. homopiperazine), azacyclooctane (i.e. heptamethyleneimine), aminocyclohexane (i.e. cyclohexylamine), aminocyclopentane (i.e. cyclopentylamine) and aminocycloheptane (i.e. cycloheptylamine). The crystalline material may be an aluminosilicate zeolite having considerable catalytic activity, e.g. for hydrocarbon conversion reactions.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: December 22, 1992
    Assignee: Mobil Oil Corp.
    Inventors: Clarence D. Chang, Donna M. Mitko
  • Toluene disproportionation catalyst
    Patent number: 5173461
    Abstract: A catalyst comprising a molecular sieve having a lattice aluminum content in which the silica/alumina framework mole ratio is less than 55, and having a diffusion rate constant of less than about 150 sec.sup.-1 .times.10.sup.-6 is particularly useful for vapor-phase disproportionation of toluene.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: December 22, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Robert P. Absil, Scott Han, David S. Shihabi, David O. Marler, Clarence D. Chang, Donna M. Mitko
  • Synthesis of crystalline silicoaluminophosphate composition
    Patent number: 5169614
    Abstract: This invention relates to a new crystalline silicoaluminophosphate composition, to a new and useful improvement in synthesizing said crystalline composition and to use of said crystalline composition prepared in accordance herewith as a catalyst component for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: December 8, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, John D. Lutner
  • Synthesis of crystalline aluminophosphate composition
    Patent number: 5147626
    Abstract: This invention relates to a new crystalline aluminophosphate composition, to a new and useful improvement in synthesizing said crystalline composition and to use of said crystalline composition prepared in accordance herewith as a catalyst component for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: September 15, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, John D. Lutner
  • Synthesis of crystalline silicoaluminophosphate composition
    Patent number: 5147627
    Abstract: This invention relates to a new crystalline silicoaluminophosphate composition, to a new and useful improvement in synthesizing said crystalline composition and to use of said crystalline composition prepared in accordance herewith as a catalyst component for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: September 15, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, John D. Lutner
  • Synthesis of crystalline metalloaluminophosphate composition
    Patent number: 5147525
    Abstract: This invention relates to a new crystalline metalloaluminophosphate composition, to a new and useful improvement in synthesizing said crystalline composition and to use of said crystalline composition prepared in accordance herewith as a catalyst component for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: September 15, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, John D. Lutner
  • Preparation of hydroxyl-rich zeolites
    Patent number: 5143876
    Abstract: Zeolites (e.g. ZSM-5 and zeolite beta) enriched with hydroxyl groups are prepared by ammonia treatment of sieves which have suffered loss of tetrahedral aluminum from framework positions followed by careful calcination (200.degree.-450.degree. C.). The hydroxyl group created by this method are stable only to 500.degree. C.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: September 1, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, Stuart D. Hellring
  • Synthesis of crystalline metalloaluminophosphate composition
    Patent number: 5141729
    Abstract: This invention relates to a new crystalline metalloaluminophosphate composition, to a new and useful improvement in synthesizing said crystalline composition and to use of said crystalline composition prepared in accordance herewith as a catalyst component for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: August 25, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, John D. Lutner
  • Synthesis of crystalline aluminophosphate composition
    Patent number: 5141728
    Abstract: This invention relates to a new crystalline aluminophosphate composition, to a new and useful improvement in synthesizing said crystalline composition and to use of said crystalline composition prepared in accordance herewith as a catalyst component for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: August 25, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, John D. Lutner
  • Activation of zeolites using hydrate of trivalent metal fluoride
    Patent number: 5126296
    Abstract: A method for enhancing the activity of a porous crystalline zeolite having a framework silica-to-alumina mole ratio of 25 or more which comprises contacting the zeolite with a solution comprising a hydrate of trivalent metal fluoride in aqueous media under conditions sufficient to cause incorporation of said metal in the framework of said zeolite.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: June 30, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Scott Han, Clarence D. Chang
  • Crystalline (metallo) aluminophosphate composition MCM-40, its synthesis and usage in hydrocarbon conversion
    Patent number: 5104495
    Abstract: This invention relates to a new crystalline composition MCM-40, to a method for synthesizing said crystalline composition using diaminocyclohexane as a directing agent and to use of said crystalline composition as a catalyst component for organic compound, e.g. hydrocarbon compound, conversion.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: April 14, 1992
    Assignee: Mobil Oil Corp.
    Inventors: Clarence D. Chang, John D. Lutner, John L. Schlenker
  • Crystalline molecular sieve compositions MCM-37
    Patent number: 5091073
    Abstract: This invention relates to a novel synthetic crystalline molecular sieve composition, MCM-37, which may contain framework +3 valence element, e.g. aluminum, and +5 valence element, e.g. phosphorus or with an addition +4 valence element, e.g. silicon, and to use thereof as a support and in catalytic conversion of organic compounds. The crystalline composition of this invention can easily be converted to catalytically active material.
    Type: Grant
    Filed: July 13, 1990
    Date of Patent: February 25, 1992
    Assignee: Mobil Oil Corp.
    Inventors: Clarence D. Chang, Cynthia T. W. Chu, Ralph M. Dessau, John B. Higgins, John D. Lutner, John D. Schlenker
  • Synthesis of large pore zeolites containing gallium
    Patent number: 5061466
    Abstract: The invention is directed to increasing the cracking activity and providing aromatization activity to a large pore zeolite by incorporating gallium into the framework of a large pore zeolite.
    Type: Grant
    Filed: November 16, 1987
    Date of Patent: October 29, 1991
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, Cynthia T. Chu, Thomas F. Degnan, Jr., Sharon B. McCullen