Patents by Inventor Raisa Minkov

Raisa Minkov 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).

  • Publication number: 20110278227
    Abstract: The present invention discloses a new type of high performance polymer membranes prepared from aromatic polyimide membranes by thermal treating and crosslinking and methods for making and using these membranes. The polymer membranes were prepared from aromatic polyimide membranes by thermal treating under inert atmosphere followed by crosslinking preferably by using a UV radiation source. The aromatic polyimide membranes were made from aromatic polyimide polymers comprising both pendent hydroxy functional groups ortho to the heterocyclic imide nitrogen and cross-linkable functional groups in the polymer backbone. The membranes showed significantly improved selectivity and permeability for gas separations compared to the aromatic polyimide membranes without any treatment. The membranes can be fabricated into any convenient geometry and are not only suitable for a variety of liquid, gas, and vapor separations, but also can be used for other applications such as for catalysis and fuel cell applications.
    Type: Application
    Filed: June 22, 2011
    Publication date: November 17, 2011
    Applicant: UOP LLC
    Inventors: Chunqing Liu, Peter K. Coughlin, Man-Wing Tang, Raisa Minkov, Lubo Zhou
  • Publication number: 20110077312
    Abstract: The present invention discloses a novel method to improve the selectivities of polybenzoxazole (PBO) membranes prepared from aromatic polyimide membranes for gas, vapor, and liquid separations. The PBO membranes that were prepared by thermal treating aromatic polyimide membranes containing between 0.05 and 20 wt-% of a poly(styrene sulfonic acid) polymer. These polymers showed up to 95% improvement in selectivity for CO2/CH4 and H2/CH4 separations compared to PBO membranes prepared from corresponding aromatic polyimide membranes without a poly(styrene sulfonic acid) polymer.
    Type: Application
    Filed: September 10, 2010
    Publication date: March 31, 2011
    Applicant: UOP LLC
    Inventors: Chunqing Liu, Raisa Minkov, Man-Wing Tang, Lubo Zhou, Jeffery C. Bricker
  • Publication number: 20110072973
    Abstract: The present invention discloses a blends of an aromatic polyimide polymer and a polymer containing aromatic sulfonic acid groups that can be converted into polybenzoxazole (PBO) membranes for gas, vapor, and liquid separations. The PBO membranes that were prepared by thermal treating aromatic polyimide membranes containing between 0.05 and 20 wt-% of a poly(styrene sulfonic acid) polymer. These polymers showed up to 95% improvement in selectivity for CO2/CH4 and H2/CH4 separations compared to PBO membranes prepared from corresponding aromatic polyimide membranes without a poly(styrene sulfonic acid) polymer.
    Type: Application
    Filed: September 10, 2010
    Publication date: March 31, 2011
    Applicant: UOP LLC
    Inventors: Chunqing Liu, Raisa Minkov, Man-Wing Tang, Lubo Zhou, Jeffery C. Bricker
  • Publication number: 20100326913
    Abstract: The present invention discloses high performance polybenzoxazole membranes prepared from aromatic poly(o-hydroxy amide) membranes by thermal cyclization and a method for using these membranes. The polybenzoxazole membranes were prepared by thermal treating aromatic poly(o-hydroxy amide) membranes in a temperature range of 200° to 550° C. under inert atmosphere. The aromatic poly(o-hydroxy amide) membranes used for making the polybenzoxazole membranes were prepared from aromatic poly(o-hydroxy amide) polymers comprising pendent phenolic hydroxyl groups ortho to the amide nitrogen in the polymer backbone. In some embodiments of the invention, the polybenzoxazole membranes may be subjected to an additional crosslinking step to increase the selectivity of the membranes.
    Type: Application
    Filed: September 10, 2010
    Publication date: December 30, 2010
    Applicant: UOP LLC
    Inventors: Chunqing Liu, Raisa Minkov, Syed A. Faheem, Man-Wing Tang, Lubo Zhou, Jeffery C. Bricker
  • Publication number: 20100331437
    Abstract: The present invention discloses high performance polybenzoxazole membranes prepared from aromatic poly(o-hydroxy amide) membranes by thermal cyclization and a method for using these membranes. The polybenzoxazole membranes were prepared by thermal treating aromatic poly(o-hydroxy amide) membranes in a temperature range of 200° to 550° C. under inert atmosphere. The aromatic poly(o-hydroxy amide) membranes used for making the polybenzoxazole membranes were prepared from aromatic poly(o-hydroxy amide) polymers comprising pendent phenolic hydroxyl groups ortho to the amide nitrogen in the polymer backbone. In some embodiments of the invention, the polybenzoxazole membranes may be subjected to an additional crosslinking step to increase the selectivity of the membranes.
    Type: Application
    Filed: September 10, 2010
    Publication date: December 30, 2010
    Applicant: UOP LLC
    Inventors: Chunqing Liu, Raisa Minkov, Syed A. Faheem, Man-Wing Tang, Lubo Zhou, Jeffery C. Bricker
  • Patent number: 7810652
    Abstract: The present invention discloses a novel method to improve the selectivities of polybenzoxazole (PBO) membranes prepared from aromatic polyimide membranes for gas, vapor, and liquid separations. The PBO membranes that were prepared by thermal treating aromatic polyimide membranes containing between 0.05 and 20 wt-% of a poly(styrene sulfonic acid) polymer. These polymers showed up to 95% improvement in selectivity for CO2/CH4 and H2/CH4 separations compared to PBO membranes prepared from corresponding aromatic polyimide membranes without a poly(styrene sulfonic acid) polymer.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: October 12, 2010
    Assignee: UOP LLC
    Inventors: Chunqing Liu, Raisa Minkov, Man-Wing Tang, Lubo Zhou, Jeffery C. Bricker
  • Publication number: 20100133188
    Abstract: The present invention discloses high performance polybenzoxazole membranes prepared from aromatic poly(o-hydroxy amide) membranes by thermal cyclization and a method for using these membranes. The polybenzoxazole membranes were prepared by thermal treating aromatic poly(o-hydroxy amide) membranes in a temperature range of 200° to 550° C. under inert atmosphere. The aromatic poly(o-hydroxy amide) membranes used for making the polybenzoxazole membranes were prepared from aromatic poly(o-hydroxy amide) polymers comprising pendent phenolic hydroxyl groups ortho to the amide nitrogen in the polymer backbone. In some embodiments of the invention, the polybenzoxazole membranes may be subjected to an additional crosslinking step to increase the selectivity of the membranes.
    Type: Application
    Filed: June 25, 2009
    Publication date: June 3, 2010
    Inventors: Chunqing Liu, Raisa Minkov, Syed A. Faheem, Man-Wing Tang, Lubo Zhou, Jeffery C. Bricker
  • Publication number: 20100133190
    Abstract: The present invention discloses a novel method to improve the selectivities of polybenzoxazole (PBO) membranes prepared from aromatic polyimide membranes for gas, vapor, and liquid separations. The PBO membranes that were prepared by thermal treating aromatic polyimide membranes containing between 0.05 and 20 wt-% of a poly(styrene sulfonic acid) polymer. These polymers showed up to 95% improvement in selectivity for CO2/CH4 and H2/CH4 separations compared to PBO membranes prepared from corresponding aromatic polyimide membranes without a poly(styrene sulfonic acid) polymer.
    Type: Application
    Filed: September 25, 2009
    Publication date: June 3, 2010
    Applicant: UOP LLC
    Inventors: Chunqing Liu, Raisa Minkov, Man-Wing Tang, Lubo Zhou, Jeffery C. Bricker