Patents by Inventor William J. Koros

William J. Koros 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: 11130098
    Abstract: The invention is an improved method of making a carbon molecular sieve (CMS) membrane in which a precursor polymer is pyrolyzed to form a carbon molecular sieve membrane that is then exposed to a conditioning atmosphere comprised of a target permeate gas molecule such as ethylene when the membrane is desired to separate it from a light hydrocarbon gas stream. The exposure to the ethylene desirably occurs prior to the CMS permeance and selectivity combination substantially changing (e.g., within 5 days) of cooling from the pyrolyzing temperature. The CMS membranes have shown an improved combination of selectivity and permeance as well as stability and are useful to separate gases in gas streams such methane from natural gas, oxygen from air and ethylene or propylene from light hydrocarbon streams.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: September 28, 2021
    Assignee: Dow Global Technologies LLC
    Inventors: John Hessler, William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez
  • Patent number: 11084000
    Abstract: The invention is an improved method of making a carbon molecular sieve (CMS) membrane in which a polyimide precursor polymer is pyrolyzed to form a carbon molecular sieve membrane by heating, in a furnace, said polyimide precursor polymer to a final pyrolysis temperature of 600 C to 700 C at a pyrolysis heating rate of 3 to 7 C/minute from 400 C to the final pyrolysis temperature, the final pyrolysis temperature being held for a pyrolysis time of at most 60 minutes in a non-oxidizing atmosphere. In a particular embodiment, the cooling rate from the pyrolysis temperature is accelerated by methods to remove heat. The CMS membranes have shown an improved combination of selectivity and permeance as well as being particularly suitable to separate gases in gas streams such methane from natural gas, oxygen from air and ethylene or propylene from light hydrocarbon streams.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: August 10, 2021
    Assignees: Dow Global Technologies LLC, Georgia Tech Research Corporation
    Inventors: John Hessler, William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez
  • Publication number: 20210229030
    Abstract: The invention is an improved method of making an improved carbon molecular sieve (CMS) membrane in which a precursor polymer (e.g., polyimide) is pyrolyzed at a pyrolysis temperature to form a CMS membrane that is cooled to ambient temperature (about 40° C. or 30° C. to about 20° C.). The CMS membrane is then reheated to a reheating temperature less than the pyrolysis temperature to form the improved CMS membrane. The improved CMS membranes have shown an improved combination of selectivity and permeance as well as stability for separating hydrogen from gas molecules (e.g., methane, ethane, propane, ethylene, propylene, butane, carbon dioxide, nitrogen, butylene, and combinations thereof).
    Type: Application
    Filed: April 3, 2019
    Publication date: July 29, 2021
    Applicants: Dow Global Technologies LLC, Georgia Tech Research Corporation
    Inventors: Justin T. Vaughn, Wulin Qiu, William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez
  • Publication number: 20210129085
    Abstract: The invention is an improved method of making an improved carbon molecular sieve (CMS) membrane in which a precursor polymer (e.g., polyimide) is pyrolyzed at a pyrolysis temperature to form a CMS membrane that is cooled to ambient temperature (about 40° C. or 30° C. to about 20° C.). The CMS membrane is then reheated to a reheating temperature of at least 250° C. to 400° C. to form the improved CMS membrane. The CMS have a novel microstructure as determined by Raman spectroscopy. The improved CMS membranes have shown an improved combination of selectivity and permeance as well as stability for separating light hydrocarbon gas molecules such as C1 to C6 hydrocarbon gases (e.g., methane, ethane, propane, ethylene, propylene, butane, butylene).
    Type: Application
    Filed: April 3, 2019
    Publication date: May 6, 2021
    Applicants: Dow Global Technologies LLC, Georgia Tech Research Corporation
    Inventors: Liren Xu, Thomas Fitzgibbons, Mark K. Brayden, Marcos V. Martinez, William J. Koros, Wulin Qiu
  • Publication number: 20200276542
    Abstract: A carbon molecular sieve (CMS) membrane having improved separation characteristics for separating olefins from their corresponding paraffins is comprised of carbon with at most trace amounts of sulfur and a group 13 metal. The CMS membrane may be made by pyrolyzing a precursor polymer devoid of sulfur in which the precursor polymer has had a group 13 metal incorporated into it, wherein the metal is in a reduced state. The pyrolyzing for the precursor having the group 13 metal incorporated into it is performed in a nonoxidizing atmosphere and at a heating rate and temperature such that the metal in a reduced state (e.g., covalently bonded to carbon or nitrogen or in the metal state).
    Type: Application
    Filed: June 8, 2018
    Publication date: September 3, 2020
    Applicants: Dow Global Technologies LLC, Georgia Tech Research Corporation
    Inventors: Yu-Han Chu, William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez
  • Patent number: 10633501
    Abstract: This disclosure provides an investigation of the kinetic uptake properties of water in amorphous PEF and PET across the entire water activity interval at various temperatures, and also investigates the corresponding equilibrium uptake properties at the same conditions. Uptake data were measured using three independent and complementary methodologies, and excellent agreement was observed among all three methodologies. Accordingly, this disclosure provides for methods of plasticizing poly(ethylene furanoate) film by cold water sorption, and provides a plasticized poly(ethylene furanoate) (PEF) film made according to the disclosed methods. Methods for making thin films of PEF are also provided.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: April 28, 2020
    Assignee: The Coca-Cola Company
    Inventors: Ronald D. Moffitt, Robert Kriegel, Christopher Mubarak, William J. Koros, Steven K. Burgess, Dharmik S. Mikkilineni, Daniel Yu, Danny J. Kim
  • Publication number: 20190247806
    Abstract: A polyimide separation membrane is comprised of a polyimide, a halogen compound (e.g., halogenated aromatic epoxide) that is soluble in the polyimide and a hydrocarbon having 2 to 5 carbons (e.g., ethane, ethylene, propane or propylene). The gas separation membrane has improved selectivity for small gas molecules such as hydrogen compared to polyimide membrane not containing the halogen compound or hydrocarbon. The polyimide separation membrane may be made by shaping a dope solution comprised of a polyimide, a halogen containing compound that is soluble in the polyimide, removing the solvent and then exposing the untreated polyimide membrane to a treating atmosphere comprising a hydrocarbon having 2 to 5 carbons for a sufficient time to form the polyimide membrane.
    Type: Application
    Filed: September 25, 2017
    Publication date: August 15, 2019
    Inventors: Liren Xu, Justin T. Vaughn, Wulin Qiu, William J. Koros, Mark K. Brayden, Marcos V. Martinez
  • Publication number: 20190118133
    Abstract: A carbon molecular sieve (CMS) membrane having improved separation characteristics for separating olefins from their corresponding paraffins is comprised of carbon with at most trace amounts of sulfur and a transition metal, wherein the transition metal is one or more of a group 4-10 and 12 transition metal. The CMS membrane may be made by pyrolyzing a precursor polymer devoid of sulfur in which the precursor polymer has had a transition metal incorporated into it. The pyrolyzing for the precursor having the transition metal incorporated into it is performed in a nonoxidizing atmosphere and at a heating rate and temperature such that the metal has a valence greater than zero (i.e., not metal bonded) to a valence desirably closer to its maximum valence.
    Type: Application
    Filed: April 25, 2017
    Publication date: April 25, 2019
    Inventors: Yu-Han Chu, William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez
  • Publication number: 20190099722
    Abstract: The invention is an improved method of making a carbon molecular sieve (CMS) membrane in which a polyimide precursor polymer is pyrolyzed to form a carbon molecular sieve membrane by heating, in a furnace, said polyimide precursor polymer to a final pyrolysis temperature of 600 C to 700 C at a pyrolysis heating rate of 3 to 7 C/minute from 400 C to the final pyrolysis temperature, the final pyrolysis temperature being held for a pyrolysis time of at most 60 minutes in a non-oxidizing atmosphere. In a particular embodiment, the cooling rate from the pyrolysis temperature is accelerated by methods to remove heat. The CMS membranes have shown an improved combination of selectivity and permeance as well as being particularly suitable to separate gases in gas streams such methane from natural gas, oxygen from air and ethylene or propylene from light hydrocarbon streams.
    Type: Application
    Filed: March 2, 2017
    Publication date: April 4, 2019
    Inventors: John Hessler, William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez
  • Publication number: 20180369761
    Abstract: The invention is an improved method of making a carbon molecular sieve (CMS) membrane in which a precursor polymer is pyrolyzed to form a carbon molecular sieve membrane that is then exposed to a conditioning atmosphere comprised of a target permeate gas molecule such as ethylene when the membrane is desired to separate it from a light hydrocarbon gas stream. The exposure to the ethylene desirably occurs prior to the CMS permeance and selectivity combination substantially changing (e.g., within 5 days) of cooling from the pyrolyzing temperature. The CMS membranes have shown an improved combination of selectivity and permeance as well as stability and are useful to separate gases in gas streams such methane from natural gas, oxygen from air and ethylene or propylene from light hydrocarbon streams.
    Type: Application
    Filed: November 30, 2016
    Publication date: December 27, 2018
    Inventors: John Hessler, William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez
  • Publication number: 20170306119
    Abstract: This disclosure provides an investigation of the kinetic uptake properties of water in amorphous PEF and PET across the entire water activity interval at various temperatures, and also investigates the corresponding equilibrium uptake properties at the same conditions. Uptake data were measured using three independent and complementary methodologies, and excellent agreement was observed among all three methodologies. Accordingly, this disclosure provides for methods of plasticizing poly(ethylene furanoate) film by cold water sorption, and provides a plasticized poly(ethylene furanoate) (PEF) film made according to the disclosed methods. Methods for making thin films of PEF are also provided.
    Type: Application
    Filed: September 15, 2015
    Publication date: October 26, 2017
    Applicants: THE COCA-COLA COMPANY, GEORGIA TECH RESEARCH CORPORATION
    Inventors: Ronald D. Moffitt, Robert Kriegel, Christopher Mubarak, William J. Koros, Steven K. Burgess, Dharmik S. Mikkilineni, Daniel Yu, Danny J. Kim
  • Patent number: 9527045
    Abstract: A carbon molecular sieve (CMS) membrane is made by pyrolyzing a film or hollow fiber membrane made of a polyimide polymer or copolymer essentially consisting of repeating units of dianhydride-derived units and diamine-derived units. At least 50% of the dianhydride-derived units are derived from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane (6FDA). At least 50% of the diamine-derived units are derived from 2,5-diethyl-6-methyl-1,3-diamino benzene (DETDA).
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: December 27, 2016
    Assignees: L'Air Liquide Société Anonyme pour l'Étude et l'Exploitation des Procedes Georges Claude, Georgia Tech Research Corporation
    Inventors: William J. Koros, Shilu Fu, Edgar S. Sanders, Jr., Sudhir S. Kulkarni
  • Patent number: 9346011
    Abstract: A hollow fiber carbon molecular sieve membrane, a process for preparing the hollow fiber carbon molecular sieve membrane, and a process for effecting separation of an olefin from a gaseous mixture that comprises the olefin in admixture with its corresponding paraffin and optionally one or more gaseous components selected from hydrogen, an olefin other than the olefin and a paraffin other than the corresponding paraffin. The process and membrane may also be used to effect separation of the olefin(s) from remaining feedstream components subsequent to an olefin-paraffin separation.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: May 24, 2016
    Inventors: William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez, Brien A. Stears
  • Patent number: 9233339
    Abstract: A composite structure for capturing a gaseous electrophilic species, the composite structure comprising mesoporous refractory sorbent particles on which an ionic liquid is covalently attached, wherein said ionic liquid includes an accessible functional group that is capable of binding to said gaseous electrophilic species. In particular embodiments, the mesoporous sorbent particles are contained within refractory hollow fibers. Also described is a method for capturing a gaseous electrophilic species by use of the above-described composite structure, wherein the gaseous electrophilic species is contacted with the composite structure.
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: January 12, 2016
    Assignees: UT-BATTELLE, LLC, GEORGIA TECH RESEARCH CORPORATION
    Inventors: Jong Suk Lee, William J. Koros, Nitesh Bhuwania, Patrick C. Hillesheim, Sheng Dai
  • Publication number: 20150322462
    Abstract: The invention pertains to, for example, an improved sorbent and process for removing fermentation inhibitors such as furfural and/or HMF in microbial processes utilizing fermentable sugars obtained from biomass including, for example, in the production of bioalcohols. The sorbent is capable of separating one or more inhibitors from monosaccharides and is characterized by: (1) a Ksugar partition coefficient of less than about 5 and (2) one or more of the following characteristics: (a) a furfural sorption capacity of at least about 200 mg/g sorbent at a furfural solution concentration of 2.5 grams per liter of water; (b) an Mt/M? of at least about 0.9 at 7.5 sec1/2; and (c) a Kfurfural partition coefficient of greater than about 3000.
    Type: Application
    Filed: May 9, 2014
    Publication date: November 12, 2015
    Applicant: GEORGIA TECH RESEARCH CORPORATION
    Inventors: William J. KOROS, Kuang ZHANG
  • Patent number: 9101093
    Abstract: The invention provides systems and methods for the delivery of carbon to photoautotrophs. The invention utilizes low energy regeneration of adsorbent for CO2 capture and provides for effective CO2 loading into liquids useful for photoautotroph growth and/or production of photosynthetic products, such as biofuels, via photoautotrophic culture media. The inventive system comprises a fluid/membrane/fluid contactor that provides selective transfer of molecular CO2 via a dense (non-porous) membrane from a carbonate-based CO2 snipping solution to a culture medium where the CO2 is consumed by a photoautotroph for the production of biofuels, biofuel precursors or other commercial products.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: August 11, 2015
    Assignees: Algenol Biotech LLC, Georgia Tech Research Corp.
    Inventors: Ronald Chance, William J. Koros, Benjamin McCool, James Noel
  • Publication number: 20150182921
    Abstract: A carbon molecular sieve (CMS) membrane is made by pyrolyzing a film or hollow fiber membrane made of a polyimide polymer or copolymer essentially consisting of repeating units of dianhydride-derived units and diamine-derived units. At least 50% of the dianhydride-derived units are derived from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane (6FDA). At least 50% of the diamine-derived units are derived from 2,5-diethyl-6-methyl-1,3-diamino benzene (DETDA).
    Type: Application
    Filed: December 23, 2014
    Publication date: July 2, 2015
    Inventors: William J. KOROS, Shilu Fu, Edgar S. Sanders, JR., Sudhir S. Kulkarni
  • Patent number: 9060466
    Abstract: The invention provides systems and methods for the delivery of carbon to photoautotrophs. The invention utilizes low energy regeneration of adsorbent for CO2 capture and provides for effective CO2 loading into liquids useful for photoautotroph growth and/or production of photosynthetic products, such as biofuels, via photoautotrophic culture media. The inventive system comprises a fluid/membrane/fluid contactor that provides selective transfer of molecular CO2 via a dense (non-porous) membrane from a carbonate-based CO2 snipping solution to a culture medium where the CO2 is consumed by a photoautotroph for the production of biofuels, biofuel precursors or other commercial products.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: June 23, 2015
    Assignees: Algenol Biotech LLC, Georgia Tech Research Corp.
    Inventors: Ronald Chance, William J. Koros, Benjamin McCool, James Noel
  • Publication number: 20150114906
    Abstract: Described is a liquid separation device comprising a porous support structure further comprising polymeric hollow fibers; an inorganic mesoporous silica membrane disposed on the porous support structure, wherein the inorganic mesoporous silica membrane is free of defects; and wherein the inorganic mesoporous silica membrane has a network of interconnected three-dimensional pores that interconnect with the porous support structure; and wherein the inorganic mesoporous silica membrane is a silylated mesoporous membrane. Also described are methods for making and using the liquid separation device.
    Type: Application
    Filed: October 16, 2014
    Publication date: April 30, 2015
    Applicants: Phillips 66 Company, Georgia Tech Research Corporation
    Inventors: Sankar Nair, Hyung-Ju Kim, William J. Koros, Kwang-Suk Jang, Justin R. Johnson, Christopher W. Jones, Joe D. Allison, Jeffrey H. Drese
  • Publication number: 20150053079
    Abstract: A hollow fiber carbon molecular sieve membrane, a process for preparing the hollow fiber carbon molecular sieve membrane, and a process for effecting separation of an olefin from a gaseous mixture that comprises the olefin in admixture with its corresponding paraffin and optionally one or more gaseous components selected from hydrogen, an olefin other than the olefin and a paraffin other than the corresponding paraffin. The process and membrane may also be used to effect separation of the olefin(s) from remaining feedstream components subsequent to an olefin-paraffin separation.
    Type: Application
    Filed: April 29, 2013
    Publication date: February 26, 2015
    Applicants: Dow Global Technologies LLC, Georgia Tech Research Corporation
    Inventors: William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez, Brien A. Stears