Patents by Inventor John L. Dawkins

John L. Dawkins 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).

  • Process for the production of chlorinated hydrocarbons
    Patent number: 11945761
    Abstract: A process of the type for producing 1,1,1,2,3-pentachloropropane by introducing 1,1,1,3-tetrachloropropane, chlorine, and Lewis acid catalyst, optionally in the presence of carbon tetrachloride, the improvement comprising introducing the Lewis acid as a slurry within a chlorinated hydrocarbon.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: April 2, 2024
    Assignee: OCCIDENTAL CHEMICAL CORPORATION
    Inventors: John L. Dawkins, Darrell Hollis, Keith S. Kramer, Brian Calderwood, Michael A. Garmon
  • PHOTOCHLORINATION OF PARTIALLY-CHLORINATED CHLOROMETHANES TO CARBON TETRACHLORIDE
    Publication number: 20240025823
    Abstract: A method of producing carbon tetrachloride includes providing a chloromethanes stream, combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine, introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to suitable reaction conditions to form product carbon tetrachloride, and collecting a product stream including the product carbon tetrachloride.
    Type: Application
    Filed: October 3, 2023
    Publication date: January 25, 2024
    Inventors: Robert L. ZELLER, III, Darrell G. HOLLIS, Keith S. KRAMER, Brian CALDERWOOD, Rodney L. KLAUSMEYER, John L. DAWKINS
  • Photochlorination of partially-chlorinated chloromethanes to carbon tetrachloride
    Patent number: 11780792
    Abstract: A method of producing carbon tetrachloride includes providing a chloromethanes stream, combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine, introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to suitable reaction conditions to form product carbon tetrachloride, and collecting a product stream including the product carbon tetrachloride.
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: October 10, 2023
    Assignee: Occidental Chemical Corporation
    Inventors: Robert L. Zeller, III, Darrell G. Hollis, Keith S. Kramer, Brian Calderwood, Rodney L. Klausmeyer, John L. Dawkins
  • Method for making 1,1,3,3-tetrachloropropene
    Patent number: 11565988
    Abstract: A process for the manufacture of 1,1,3,3-tetrachloropropene, the process comprising dehydrochlorinating 1,1,1,3,3-pentachloropropane, where said step of dehydrochlorinating 1,1,1,3,3-pentachloropropane takes place in the presence of an oxidizing agent and in the presence of a Lewis acid, and where the oxidizing agent is chlorine and the Lewis acid is ferric chloride.
    Type: Grant
    Filed: August 27, 2021
    Date of Patent: January 31, 2023
    Assignee: Occidental Chemical Corporation
    Inventors: Rodney L. Klausmeyer, Darrell G. Hollis, Keith S. Kramer, John L. Dawkins, Derrek Rae Burrows
  • PHOTOCHLORINATION OF PARTIALLY-CHLORINATED CHLOROMETHANES TO CARBON TETRACHLORIDE
    Publication number: 20220119326
    Abstract: A method of producing carbon tetrachloride includes providing a chloromethanes stream, combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine, introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to suitable reaction conditions to form product carbon tetrachloride, and collecting a product stream including the product carbon tetrachloride.
    Type: Application
    Filed: January 10, 2020
    Publication date: April 21, 2022
    Inventors: Robert L. ZELLER, III, Darrell G. HOLLIS, Keith S. KRAMER, Brian CALDERWOOD, Rodney L. KLAUSMEYER, John L. DAWKINS
  • METHOD FOR MAKING 1,1,3,3-TETRACHLOROPROPENE
    Publication number: 20210387932
    Abstract: A process for the manufacture of 1,1,3,3-tetrachloropropene, the process comprising dehydrochlorinating 1,1,1,3,3-pentachloropropane, where said step of dehydrochlorinating 1,1,1,3,3-pentachloropropane takes place in the presence of an oxidizing agent and in the presence of a Lewis acid, and where the oxidizing agent is chlorine and the Lewis acid is ferric chloride.
    Type: Application
    Filed: August 27, 2021
    Publication date: December 16, 2021
    Inventors: Rodney L. KLAUSMEYER, Darrell G. HOLLIS, Keith S. KRAMER, John L. DAWKINS, Derrek Rae BURROWS
  • PROCESS FOR THE PRODUCTION OF CHLORINATED HYDROCARBONS
    Publication number: 20210355052
    Abstract: A process of the type for producing 1,1,1,2,3-pentachloropropane by introducing 1,1,1,3-tetrachloropropane, chlorine, and Lewis acid catalyst, optionally in the presence of carbon tetrachloride, the improvement comprising introducing the Lewis acid as a slurry within a chlorinated hydrocarbon.
    Type: Application
    Filed: July 24, 2017
    Publication date: November 18, 2021
    Inventors: John L. DAWKINS, Darrell HOLLIS, Keith S. KRAMER, Brian CALDERWOOD, Michael A. GARMON
  • Method for making 1,1,3,3-tetrachloropropene
    Patent number: 11104627
    Abstract: A process for the manufacture of 1,1,3,3-tetrachloropropene, the process comprising dehydrochlorinating 1,1,1,3,3-pentachloropropane.
    Type: Grant
    Filed: February 17, 2020
    Date of Patent: August 31, 2021
    Assignee: Occidental Chemical Corporation
    Inventors: Rodney L. Klausmeyer, Darrell G. Hollis, Keith S. Kramer, John L. Dawkins, Derrek Rae Burrows
  • Methods for producing halogenated propanes
    Patent number: 10787404
    Abstract: A process of the type for producing chlorinated propanes by reacting carbon tetrachloride with ethylene within a tank reactor that includes a liquid reaction mixture and a headspace above the reaction mixture wherein ethylene gas diffuses from the liquid reaction mixture into the headspace while agitating the reaction mixture, the improvement comprising transferring ethylene within the headspace back into the reaction mixture through a conduit within the mixing device that agitates the reaction mixture.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: September 29, 2020
    Assignee: Occidental Chemical Corporation
    Inventors: John L Dawkins, Darrell Hollis, Keith S. Kramer, Brian Calderwood
  • METHOD FOR MAKING 1,1,3,3-TETRACHLOROPROPENE
    Publication number: 20200181047
    Abstract: A process for the manufacture of 1,1,3,3-tetrachloropropene, the process comprising dehydrochlorinating 1,1,1,3,3-pentachloropropane.
    Type: Application
    Filed: February 17, 2020
    Publication date: June 11, 2020
    Inventors: Rodney L. KLAUSMEYER, Darrell G. HOLLIS, Keith S. KRAMER, John L. DAWKINS, Derrek Rae BURROWS
  • Method for making 1,1,3,3-tetrachloropropene
    Patent number: 10562832
    Abstract: A process for the manufacture of 1,1,3,3-tetrachloropropene, the process comprising dehydrochlorinating 1,1,1,3,3-pentachloropropane.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: February 18, 2020
    Assignee: Occidental Chemical Corporation
    Inventors: Rodney L. Klausmeyer, Darrell G. Hollis, Keith S. Kramer, John L. Dawkins, Derrek Rae Burrows
  • METHODS FOR PRODUCING HALOGENATED PROPANES
    Publication number: 20190284118
    Abstract: A process of the type for producing chlorinated propanes by reacting carbon tetrachloride with ethylene within a tank reactor that includes a liquid reaction mixture and a headspace above the reaction mixture wherein ethylene gas diffuses from the liquid reaction mixture into the headspace while agitating the reaction mixture, the improvement comprising transferring ethylene within the headspace back into the reaction mixture through a conduit within the mixing device that agitates the reaction mixture.
    Type: Application
    Filed: July 24, 2017
    Publication date: September 19, 2019
    Inventors: John L DAWKINS, Darrell HOLLIS, Keith S. KRAMER, Brian CALDERWOOD
  • METHOD FOR MAKING 1,1,3,3-TETRACHLOROPROPENE
    Publication number: 20180251415
    Abstract: A process for the manufacture of 1,1,3,3-tetrachloropropene, the process comprising dehydrochlorinating 1,1,1,3,3-pentachloropropane.
    Type: Application
    Filed: May 2, 2018
    Publication date: September 6, 2018
    Inventors: Rodney L. KLAUSMEYER, Darrell G. HOLLIS, Keith S. KRAMER, John L. DAWKINS, Derrek Rae BURROWS
  • Method for making 1,1,3,3-tetrachloropropene
    Patent number: 9969664
    Abstract: A process for the manufacture of 1,1,3,3-tetrachloropropene, the process comprising dehydrochlorinating 1,1,1,3,3-pentachloropropane.
    Type: Grant
    Filed: May 14, 2015
    Date of Patent: May 15, 2018
    Assignee: Occidental Chemical Corporation
    Inventors: Rodney L. Klausmeyer, Darrell G. Hollis, Keith S. Kramer, John L. Dawkins, Derrek Rae Burrows
  • METHOD FOR MAKING 1,1,3,3-TETRACHLOROPROPENE
    Publication number: 20170081263
    Abstract: A process for the manufacture of 1,1,3,3-tetrachloropropene, the process comprising dehydrochlorinating 1,1,1,3,3-pentachloropropane.
    Type: Application
    Filed: May 14, 2015
    Publication date: March 23, 2017
    Applicant: OCCIDENTAL CHEMICAL CORPORATION
    Inventors: Rodney L. KLAUSMEYER, Darrell G. HOLLIS, Keith S. KRAMER, John L. DAWKINS, Derrek Rae BURROWS
  • Method for producing 1,1,1,3-tetrachloropropane and other haloalkanes with iron catalyst
    Publication number: 20040225166
    Abstract: A continuous process is provided for the manufacture of haloalkanes by the reaction of carbon tetrachloride with olefins in the presence of iron metal, trialkylphosphate, and ferric chloride. A fraction of the catalyst and co-catalyst are separated after the reaction and recycled. In a preferred application, the olefin is ethene, and the haloalkane product is 1,1,1,3-tetrachloropropane. Two distillation steps take place in order to enhance the production of 1,1,1,3-tetrachloropropane.
    Type: Application
    Filed: August 26, 2003
    Publication date: November 11, 2004
    Applicant: VULCAN CHEMICALS A BUSINESS GROUP OF VULCAN MATERIALS COMPANY
    Inventors: Richard L. Wilson, John L. Dawkins
  • 1,1,1,3,3-pentachloropropane process purge stream concentration using a secondary refluxed evaporator and secondary product recovery
    Patent number: 6720466
    Abstract: A process for economically producing 1,1,1,3,3-pentachloropropane under conditions which preserve the activity of the catalyst. In a preferred embodiment, a two-stage distillation process is employed. In the two-stage process, the size of the equipment, temperature and vacuum are varied.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: April 13, 2004
    Assignee: Vulcan Chemicals Division of Vulcan Materials Company
    Inventors: Richard L. Wilson, John L. Dawkins, Rodney L. Klausmeyer, James J. Weller
  • 1,1,1,3,3-pentachloropropane process purge stream concentration using a secondary refluxed evaporator and secondary product recovery
    Publication number: 20030199716
    Abstract: A process for economically producing 1,1,1,3,3-pentachloropropane under conditions which preserve the activity of the catalyst. In a preferred embodiment, a two-stage distillation process is employed. In the two-stage process, the size of the equipment, temperature and vacuum are varied.
    Type: Application
    Filed: April 17, 2002
    Publication date: October 23, 2003
    Applicant: VULCAN CHEMICALS DIVISION OF VULCAN MATERIALS COMPANY
    Inventors: Richard L. Wilson, John L. Dawkins, Rodney L. Klausmeyer, James J. Weller
  • Integrated procedure for high yield production of chlorine dioxide
    Patent number: 5458858
    Abstract: The present invention uses a new approach to generating chlorine dioxide. This approach is the use of two vessel system in which the first vessel is of a structure which enables operation to create substantially isothermal incomplete reaction conditions and in which the second vessel is of a structure to enable operation to generate a continuous decreasing temperature gradient from bottom to top thereof for substantially-completing that reaction.
    Type: Grant
    Filed: February 8, 1994
    Date of Patent: October 17, 1995
    Assignee: Vulcan Chemicals
    Inventor: John L. Dawkins