Patents by Inventor Guohua Xiu

Guohua Xiu 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 recovery and purification of nitrous oxide
    Patent number: 10464813
    Abstract: This invention is aimed at recovering and purifying nitrous oxide from the gas stream containing N2O to produce different grade of nitrous oxide by combination of unit operation including, but not limited to, wet scrubbing, adsorption, liquefaction, flash distillation or continuous distillation with reflux.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: November 5, 2019
    Assignee: VERSUM MATERIALS US, LLC
    Inventors: Guohua Xiu, Peng Zhang
  • Process for Recovery and Purification of Nitrous Oxide
    Publication number: 20140366576
    Abstract: This invention is aimed at recovering and purifying nitrous oxide from the gas stream containing N2O to produce different grade of nitrous oxide by combination of unit operation including, but not limited to, wet scrubbing, adsorption, liquefaction, flash distillation or continuous distillation with reflux.
    Type: Application
    Filed: June 4, 2014
    Publication date: December 18, 2014
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: Guohua Xiu, Peng Zhang
  • REMOVAL OF CONTAMINANTS FROM WATER SYSTEMS
    Publication number: 20120298588
    Abstract: A method for removing contaminants such as oil and solids from water by feeding a mixture of water containing the contaminants and carbon dioxide to a cyclone; separating water from the mixture; separating a second mixture of oil, carbon dioxide and water from the mixture and feeding the second mixture to a separator wherein oil, carbon dioxide and water are recovered from the separator.
    Type: Application
    Filed: May 23, 2011
    Publication date: November 29, 2012
    Inventors: Zhixiong Cha, Guohua Xiu, Yunhui Deng, Yaping Lu
  • Process for purifying PPPBP
    Patent number: 7884220
    Abstract: A method for decoloring 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (“p,p-PPPBP”) is disclosed. The method comprises contacting a liquid solution containing p,p-PPPBP and the common impurities o,p-PPPBP and aminophenone with activated carbon fibers. The activated carbon fibers adsorb the impurities, resulting in a purified solution of p,p-PPPBP. The activated carbon fibers can then be regenerated, such as with a methanol solution having a highly basic pH.
    Type: Grant
    Filed: March 19, 2007
    Date of Patent: February 8, 2011
    Assignee: General Electric Company
    Inventors: Zhongqi Xu, Guohua Xiu, Tong Sun, Jingwu Yang
  • Method of purification of dihydric phenols
    Patent number: 7528210
    Abstract: A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A; contacting the solution A with a zeolite; filtering the zeolite to form a solution B; adding an anti-solvent to the solution B to form a solution C; and distilling the solution C; wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value 1 to 4.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: May 5, 2009
    Assignee: SABIC Innovative Plastics IP B.V.
    Inventors: Guohua Xiu, Tong Sun, Jan Plen Lens, Sunil Ashtekar, Mahesh Malusare, Gurram Kishan, Pushpa Narayanan
  • PROCESS FOR PURIFYING PPPBP
    Publication number: 20080234496
    Abstract: A method for decoloring 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (“p,p-PPPBP”) is disclosed. The method comprises contacting a liquid solution containing p,p-PPPBP and the common impurities o,p-PPPBP and aminophenone with activated carbon fibers. The activated carbon fibers adsorb the impurities, resulting in a purified solution of p,p-PPPBP. The activated carbon fibers can then be regenerated, such as with a methanol solution having a highly basic pH.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 25, 2008
    Applicant: General Electric Company
    Inventors: Zhongqi Xu, Guohua Xiu, Tong Sun, Jingwu Yang
  • METHOD OF PURIFICATION OF DIHYDRIC PHENOLS
    Publication number: 20070232774
    Abstract: A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A; contacting the solution A with a zeolite; filtering the zeolite to form a solution B; adding an anti-solvent to the solution B to form a solution C; and distilling the solution C; wherein the dihydric phenol is represented by Formula (I): wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value 1 to 4.
    Type: Application
    Filed: March 30, 2006
    Publication date: October 4, 2007
    Applicant: General Electric Company
    Inventors: Guohua Xiu, Tong Sun, Jan Lens, Sunil Ashtekar, Mahesh Malusare, Gurram Kishan, Pushpa Narayanan