Patents by Inventor Mark K. Brayden

Mark K. Brayden 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
  • Publication number: 20200254393
    Abstract: A method of making a hollow fiber carbon molecular sieve is comprised of heating a hollow polymer fiber to a carbonization temperature in an atmosphere that is non-oxidizing to form a hollow fiber carbon molecular sieve, wherein during at least a portion of the heating a tensile force is applied to the hollow polymer fiber. The method may improve the separation of gases similar in size such a propylene from propane.
    Type: Application
    Filed: March 20, 2018
    Publication date: August 13, 2020
    Applicant: Dow Global Technologies LLC
    Inventors: Liren Xu, Rahul Sharma, Thomas Fitzgibbons, Mark K. Brayden, Marcos V. Martinez
  • Publication number: 20190275471
    Abstract: An asymmetric hollow fiber (CMS) carbon molecular sieve is made by providing a dope solution comprised of a polvimide and a solvent, at a temperature greater than 250° C. that is less than the storage modulus at a temperature of 250° C., but no more than ten times less as measured using dynamic mechanical thermal analysis from 250° C. to a temperature where the polyimide carbonizes. The polvimide is shaped into a hollow polvimide fiber, the solvent removed and the polyimide hollow fiber is heated to pyroiyze the polvimide and form the asymmetric hollow carbon molecular sieve. The asymmetric hollow fiber carbon molecular sieve has a wall that is defined by an inner surface and outer surface of said fiber and the wall has an inner porous support region extending from the inner surface to an outer raicroporous separation region that extends from the inner porous support region to the outer surface.
    Type: Application
    Filed: September 25, 2017
    Publication date: September 12, 2019
    Inventors: Liren Xu, Rahul Sharma, William J. Harris, Mark K. Brayden, Marcos V. Martinez
  • 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
  • Patent number: 9579627
    Abstract: A novel microporous carbon molecular sieve may be used as the basis for carbon adsorbent pellets that have discrete areas of carbonized binder and of carbonized precursor, macropores having an average pore diameter greater than or equal to 1 micrometer and a total macroporosity of at least 30 percent, both as measured by mercury porosimetry, and micropores that are capable of selectively admitting a C2-C3 alkene and excluding a C2-C3 alkane, and a total microporosity ranging from 10 percent to 30 percent. The pellets may be prepared by pyrolyzing a pellet structure comprising a carbon forming, non-melting binder and a non-porous gel type sulfonated polystyrene precursor at a temperature ranging from 500° C. to 1000° C., under an inert atmosphere and other conditions suitable to form the described pellets. The pellets are particularly useful in pressure swing and temperature swing adsorption processes to separate C2-C3 alkane/alkene mixtures.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: February 28, 2017
    Assignee: Dow Global Technologies LLC
    Inventors: Junqiang Liu, Mark K. Brayden, Edward M. Calverley, Steven R. Lakso, Yujun Liu, Marcos V. Martinez
  • 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
  • Publication number: 20160008787
    Abstract: A novel microporous carbon molecular sieve may be used as the basis for carbon adsorbent pellets that have discrete areas of carbonized binder and of carbonized precursor, macropores having an average pore diameter greater than or equal to 1 micrometer and a total macroporosity of at least 30 percent, both as measured by mercury porosimetry, and micropores that are capable of selectively admitting a C2-C3 alkene and excluding a C2-C3 alkane, and a total microporosity ranging from 10 percent to 30 percent. The pellets may be prepared by pyrolyzing a pellet structure comprising a carbon forming, non-melting binder and a non-porous gel type sulfonated polystyrene precursor at a temperature ranging from 500° C. to 1000° C., under an inert atmosphere and other conditions suitable to form the described pellets. The pellets are particularly useful in pressure swing and temperature swing adsorption processes to separate C2-C3 alkane/alkene mixtures.
    Type: Application
    Filed: March 24, 2014
    Publication date: January 14, 2016
    Inventors: Junqiang Liu, Mark K. Brayden, Edward M. Calverley, Steven R. Lakso, Yujun Liu, Marcos V. Martinez
  • 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
  • Patent number: 8382881
    Abstract: The invention provides a method for removing mercury from a liquid or gas hydrocarbon stream, mixtures thereof, including mixtures of liquid streams with a solid carbonaceous substance, by contacting the hydrocarbon stream with a composition comprising silver and a support material, wherein the composition as measured by ammonia chemisorption has a surface acidity in the range of 0.1-10.0 ?mole of irreversible NH3/g of the composition.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: February 26, 2013
    Inventors: Madan M. Bhasin, Mark K. Brayden, Foppe Dupius, Peter E. Groenendijk, Seyed R. Seyedmonir, Michael C. Smith, Fredrick W. Vance
  • Publication number: 20100126909
    Abstract: The invention provides a method for removing mercury from a liquid or gas hydrocarbon stream, mixtures thereof, including mixtures of liquid streams with a solid carbonaceous substance, by contacting the hydrocarbon stream with a composition comprising silver and a support material, wherein the composition as measured by ammonia chemisorption has a surface acidity in the range of 0.1-10.0 ?mole of irreversible NH3/g of the composition.
    Type: Application
    Filed: November 19, 2007
    Publication date: May 27, 2010
    Inventors: Madan M. Bhasin, Mark K. Brayden, Foppe Dupius, Peter E. Groenendijk, Seyed R. Seyedmonir, Michael C. Smith, Fredrick W. Vance, Frederick R. Van Buren, Marc A. Mangnus
  • Patent number: 4869827
    Abstract: This invention relates to an improved composition and method which inhibit the corrosion of and the formation of scale on metals present in an aqueous system. The composition comprises a water soluble copolymer having moieties derived from acrylic acid and from lower alkyl hydroxy acrylates, and a combination of a manganese compound and an aminoalkylenephosphonic acid derivative or its salts.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: September 26, 1989
    Assignee: The Dow Chemical Company
    Inventors: Harold A. Chagnard, Jr., Mark K. Brayden, Thomas R. LeBlanc
  • Patent number: 4774018
    Abstract: This invention relates to an improved composition and method which inhibit the corrosion of and the formation of scale on metals present in an aqueous system. The composition comprises a water soluble copolymer having moieties derived from acrylic acid and from lower alkyl hydroxy acrylates, and a combination of a manganese compound and an aminoalkylenephosphonic acid derivative or its salts.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: September 27, 1988
    Assignee: The Dow Chemical Company
    Inventors: Harold A. Chagnard, Jr., Thomas R. LeBlanc, Mark K. Brayden