Patents by Inventor Chunqing Liu

Chunqing Liu 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: 11136280
    Abstract: Systems and processes are provided to prevent light ends such as methane, ethylene and ethane from building up in an olefin/paraffin separation system that uses a combination of a membrane and distillation column for this separation. In one embodiment a small stripper column is provided downstream from a selective hydrogenation reactor. In the other embodiment, a surge vessel with a receiver is added to the retentate stream of the membrane unit.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: October 5, 2021
    Assignee: UOP LLC
    Inventors: Mander Singh, Charles P Luebke, Trung Pham, Steven Kozup, Carl Liskey, Simon E. Albo, Saadet Ulas Acikgoz, Chunqing Liu
  • Patent number: 11083992
    Abstract: A process is provided of making facilitated transport membrane comprising a relatively hydrophilic, very small pore, nanoporous support membrane, a hydrophilic polymer inside the very small nanopores on the skin layer surface of the support membrane, a thin, nonporous, hydrophilic polymer layer coated on the surface of the support membrane, and metal salts incorporated in the hydrophilic polymer layer coated on the surface of the support membrane and the hydrophilic polymer inside the very small nanopores. In addition, the process provides a new method of making facilitated transport membrane spiral wound elements or hollow fiber modules for olefin/paraffin separations, particularly for C3=/C3 and C2=/C2 separations.
    Type: Grant
    Filed: April 10, 2019
    Date of Patent: August 10, 2021
    Assignee: UOP LLC
    Inventors: Chunqing Liu, Nicole K. Karns, Howie Q. Tran, Carl W. Liskey
  • Patent number: 11033856
    Abstract: A multistage membrane system and a process for treating a gas stream is provided in which the multistage membrane system comprises at least two membrane units wherein a first stage membrane unit comprises a polymeric membrane and a second membrane unit comprises a microporous zeolitic inorganic membrane or a combination of a microporous zeolitic inorganic membrane and a polymeric membrane.
    Type: Grant
    Filed: June 14, 2018
    Date of Patent: June 15, 2021
    Assignee: UOP LLC
    Inventors: Chunqing Liu, Simon E. Albo, David W. Greer, Xueliang Dong, Mark M. Davis
  • Publication number: 20210039052
    Abstract: A thin film composite gas separation membrane comprising a polyether block amide copolymer coating layer and a nanoporous asymmetric support membrane with nanopores on the skin layer surface of the support membrane and gelatin polymers inside the nanopores on the skin layer surface of the support membrane. A method for making the thin film composite gas separation membrane is provided as well as the use of the membrane for a variety of separations such as separations of hydrogen sulfide and carbon dioxide from natural gas, carbon dioxide removal from flue gas, fuel gas conditioning, hydrogen/methane, polar molecules, and ammonia mixtures with methane, nitrogen or hydrogen and other light gases separations, but also for natural gas liquids recovery and hydrogen sulfide and carbon dioxide removal from natural gas in a single step.
    Type: Application
    Filed: August 6, 2019
    Publication date: February 11, 2021
    Inventors: Xueliang Dong, Chunqing Liu, Howie Tran
  • Publication number: 20200377430
    Abstract: Systems and processes are provided to prevent light ends such as methane, ethylene and ethane from building up in an olefin/paraffin separation system that uses a combination of a membrane and distillation column for this separation. In one embodiment a small stripper column is provided downstream from a selective hydrogenation reactor. In the other embodiment, a surge vessel with a receiver is added to the retentate stream of the membrane unit.
    Type: Application
    Filed: May 29, 2019
    Publication date: December 3, 2020
    Inventors: Mander Singh, Charles P Luebke, Trung Pham, Steven Kozup, Carl Liskey, Simon E. Albo, Saadet Ulas Acikgoz, Chunqing Liu
  • Patent number: 10751670
    Abstract: This invention provides a new high selectivity stable facilitated transport membrane comprising a polyethersulfone (PES)/polyethylene oxide-polysilsesquioxane (PEO-Si) blend support membrane, a hydrophilic polymer inside the pores on the skin layer surface of the PES/PEO-Si blend support membrane; a hydrophilic polymer coated on the skin layer surface of the PES/PEO-Si blend support membrane, and metal salts incorporated in the hydrophilic polymer coating layer and the skin layer surface pores of the PES/PEO-Si blend support membrane, and methods of making such membranes. This invention also provides a method of using the high selectivity stable facilitated transport membrane comprising PES/PEO-Si blend support membrane for olefin/paraffin separations such as propylene/propane and ethylene/ethane separations.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: August 25, 2020
    Assignee: UOP LLC
    Inventors: Chunqing Liu, Nicole K. Karns, Howie Q. Tran, Dung Le
  • Patent number: 10683246
    Abstract: A process is provided for separation of light olefins and paraffins and particular for the separation of propylene and propane comprising sending at least one olefin/paraffin stream to a distillation column and a membrane unit to produce an olefin stream comprising at least 92 mol % olefin. In an embodiment of the invention where the membrane unit is placed downstream from the column which can produce propylene streams at polymer grade of over 99.5 mol % propylene.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: June 16, 2020
    Assignee: UOP LLC
    Inventors: Chunqing Liu, Lubo Zhou, Stanley J. Frey, Gregory R. Werba, Carl W. Liskey, Simon E. Albo, Trung Pham
  • Patent number: 10654004
    Abstract: This invention provides a new high flux reverse osmosis (RO) membrane comprising a nanoporous polyethersulfone (PES)/polyethylene oxide-polysilsesquioxane (PEO-Si) blend support membrane (PES/PEO-Si) comprising a polyethylene oxide-polysilsesquioxane (PEO-Si) polymer and a polyethersulfone (PES) polymer, a hydrophilic polymer inside the pores on the skin layer surface of the polyethersulfone/polyethylene oxide-polysilsesquioxane blend support membrane, and a thin, nanometer layer of cross-linked polyamide on the skin layer surface of said polyethersulfone/polyethylene oxide-polysilsesquioxane blend support membrane, and a method of making such a membrane. This invention also provides a method of using the new high flux reverse osmosis membrane comprising nanoporous PES/PEO-Si blend support membrane for water purification.
    Type: Grant
    Filed: July 20, 2018
    Date of Patent: May 19, 2020
    Inventors: Chunqing Liu, Nicole K. Karns, Howie Q. Tran, Dung Le
  • Patent number: 10646832
    Abstract: The present invention discloses high selectivity copolyimide membranes for gas, vapor, and liquid separations. Gas permeation tests on these copolyimide membranes demonstrated that they not only showed high selectivity for CO2/CH4 separation, but also showed extremely high selectivities for H2/CH4 and He/CH4 separations. These copolyimide membranes can be used for a wide range of gas, vapor, and liquid separations such as separations of CO2/CH4, He/CH4, CO2/N2, olefin/paraffin separations (e.g. propylene/propane separation), H2/CH4, He/CH4, O2/N2, iso/normal paraffins, polar molecules such as H2O, H2S, and NH3 mixtures with CH4, N2, H2. The high selectivity copolyimide membranes have UV cross-linkable sulfonyl functional groups and can be used for the preparation of UV cross-linked high selectivity copolyimide membranes with enhanced selectivities. The invention also includes blend polymer membranes comprising the high selectivity copolyimide and polyethersulfone.
    Type: Grant
    Filed: October 27, 2017
    Date of Patent: May 12, 2020
    Inventors: Chunqing Liu, Sudipto Chakraborty, Nicole Karns
  • Patent number: 10625201
    Abstract: The invention discloses dual layer-coated membranes and methods for making and using these membranes. The dual layer-coated membranes have a relatively porous and substantial void-containing selective asymmetric membrane support, a first coating layer comprising a hydrogel, and a second coating layer comprising a hydrophobic fluoropolymer. The membrane support has low selectivity and high permeance. The dual layer coating improves the selectivity of the membrane support and maintains the membrane performance with time. The dual layer-coated membranes are suitable for a variety of liquid, gas, and vapor separations such as water purification, non-aqueous liquid separation such as deep desulfurization of gasoline and diesel fuels, ethanol/water separations, pervaporation dehydration of aqueous/organic mixtures, fuel gas conditioning, CO2/CH4, He/CH4, CO2/N2, H2/CH4, O2/N2, olefin/paraffin, iso/normal paraffins separations, and other light gas mixture separations.
    Type: Grant
    Filed: October 27, 2017
    Date of Patent: April 21, 2020
    Inventors: Carl Liskey, Chunqing Liu, Michael Hamoy, Nicole Karns, Howie Tran, David W. Greer
  • Publication number: 20200101416
    Abstract: A process is provided of making facilitated transport membrane comprising a relatively hydrophilic, very small pore, nanoporous support membrane, a hydrophilic polymer inside the very small nanopores on the skin layer surface of the support membrane, a thin, nonporous, hydrophilic polymer layer coated on the surface of the support membrane, and metal salts incorporated in the hydrophilic polymer layer coated on the surface of the support membrane and the hydrophilic polymer inside the very small nanopores. In addition, the process provides a new method of making facilitated transport membrane spiral wound elements or hollow fiber modules for olefin/paraffin separations, particularly for C3=/C3 and C2=/C2 separations.
    Type: Application
    Filed: April 10, 2019
    Publication date: April 2, 2020
    Inventors: Chunqing Liu, Nicole K. Karns, Howie Q. Tran, Carl W. Liskey
  • Patent number: 10569218
    Abstract: Combining the features of a glassy polymeric membrane and a rubbery polymeric membrane into a multiple membrane system provides a system having the advantages of both of the types of membranes. The membranes may be in any order in the system and multiple glassy polymeric membranes and multiple rubbery polymeric membranes may be used.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: February 25, 2020
    Inventor: Chunqing Liu
  • Patent number: 10569233
    Abstract: The invention provides a high permeance and high selectivity facilitated transport membrane comprising a very small pore, nanoporous polyethersulfone (PES)/polyvinylpyrrolidone (PVP) blend support membrane, a hydrophilic polymer inside the very small nanopores on the skin layer surface of the support membrane, a thin, nonporous, hydrophilic polymer layer coated on the surface of the support membrane, and metal salts incorporated in the hydrophilic polymer layer coated on the surface of the support membrane and the hydrophilic polymer inside the very small nanopores, a method of making this membrane, and the use of this membrane for olefin/paraffin separations, particularly for propylene/propane and ethylene/ethane separations.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: February 25, 2020
    Inventors: Nicole K. Karns, Chunqing Liu
  • Publication number: 20200001198
    Abstract: Process for separating a highly pure propylene product from a liquefied petroleum gas stream is disclosed, which eliminates a C3 splitter having over 120 trays and the additional equipment that a C3 splitter requires. The process includes passing a feed stream to a dividing wall column to produce an overhead stream, a first side draw stream, a second side draw stream, and a product stream. The first side draw stream is passed to a treatment unit to produce a treated stream. The treated stream is passed to a membrane unit and a permeate stream is passed from the membrane unit to produce a polymer grade propylene stream.
    Type: Application
    Filed: June 29, 2018
    Publication date: January 2, 2020
    Inventors: Stanley J. Frey, Chunqing Liu, Trung Pham
  • Publication number: 20200001242
    Abstract: A process is provided to separate a hydrocarbon stream comprising a mixture of light olefins and light paraffins, the process comprising sending the hydrocarbon stream through a pretreatment unit to remove impurities selected from the group consisting of sulfur compounds, arsine, phosphine, methyl acetylene, propadiene, and acetylene to produce a treated hydrocarbon stream; vaporizing the treated hydrocarbon stream to produce a gaseous treated hydrocarbon stream; adding liquid or vapor water to the gaseous treated hydrocarbon stream; then contacting the gaseous treated hydrocarbon stream to a membrane in a membrane system comprising one or more membrane units to produce a permeate stream comprising about 96 to 99.9 wt % light olefins and a retentate stream comprising light paraffins.
    Type: Application
    Filed: June 28, 2018
    Publication date: January 2, 2020
    Inventors: Stanley J. Frey, J. Mark Houdek, Chunqing Liu, Trung Pham
  • Publication number: 20190381449
    Abstract: A multistage membrane system and a process for treating a gas stream is provided in which the multistage membrane system comprises at least two membrane units wherein a first stage membrane unit comprises a polymeric membrane and a second membrane unit comprises a microporous zeolitic inorganic membrane or a combination of a microporous zeolitic inorganic membrane and a polymeric membrane.
    Type: Application
    Filed: June 14, 2018
    Publication date: December 19, 2019
    Inventors: Chunqing Liu, Simon E. Albo, David W. Greer, Xueliang Dong, Mark M. Davis
  • Patent number: 10507435
    Abstract: A process is provided to separate a hydrocarbon stream comprising a mixture of light olefins and light paraffins, the process comprising sending the hydrocarbon stream through a pretreatment unit to remove impurities selected from the group consisting of sulfur compounds, arsine, phosphine, methyl acetylene, propadiene, and acetylene to produce a treated hydrocarbon stream; vaporizing the treated hydrocarbon stream to produce a gaseous treated hydrocarbon stream; adding liquid or vapor water to the gaseous treated hydrocarbon stream; then contacting the gaseous treated hydrocarbon stream to a membrane in a membrane system comprising one or more membrane units to produce a permeate stream comprising about 96 to 99.9 wt % light olefins and a retentate stream comprising light paraffins.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: December 17, 2019
    Inventors: Stanley J. Frey, J. Mark Houdek, Chunqing Liu, Trung Pham
  • Patent number: 10507405
    Abstract: Process for separating a highly pure propylene product from a liquefied petroleum gas stream is disclosed, which eliminates a C3 splitter having over 120 trays and the additional equipment that a C3 splitter requires. The process includes passing a feed stream to a dividing wall column to produce an overhead stream, a first side draw stream, a second side draw stream, and a product stream. The first side draw stream is passed to a treatment unit to produce a treated stream. The treated stream is passed to a membrane unit and a permeate stream is passed from the membrane unit to produce a polymer grade propylene stream.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: December 17, 2019
    Inventors: Stanley J. Frey, Chunqing Liu, Trung Pham
  • Patent number: 10471368
    Abstract: The present invention relates to a combined C3/C4 splitter with a membrane system. More specifically, the present invention relates to a combined C3/C4 splitter column to separate highly pure propylene product from a liquefied petroleum gas stream, which eliminates a C3 splitter having over 120 trays and the additional equipment that a C3 splitter requires.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: November 12, 2019
    Inventors: Stanley J. Frey, Chunqing Liu, Trung Pham
  • Patent number: 10472306
    Abstract: The present invention relates to a combined C3/C4 splitter with a membrane system. More specifically, the present invention relates to a combined C3/C4 splitter column to separate highly pure propylene product from a liquefied petroleum gas stream, which eliminates a C3 splitter having over 120 trays and the additional equipment that a C3 splitter requires.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: November 12, 2019
    Inventors: Stanley J. Frey, Chunqing Liu, Trung Pham