Patents by Inventor Yukako KOZAWA

Yukako KOZAWA 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).

  • Method for regenerating working solution used for production of hydrogen peroxide and method for producing hydrogen peroxide using regenerated working solution
    Patent number: 10138123
    Abstract: In the production of hydrogen peroxide, when ketone forms are increased upon conversion from higher alcohol components in organic solvents, such increased levels of ketone forms reduce the water content in a working solution and lead to deterioration of catalytic activity. Moreover, increased levels of ketone forms reduce the solubility of anthrahydroquinone compounds and may cause an obstacle to stable and safe operation in the production of hydrogen peroxide due to crystallization and deposition of the anthrahydroquinone compounds. The object of the present invention is to provide a process in which polar solvent-derived altered substances (ketone forms) in a working solution provided for use in the production of hydrogen peroxide via the anthraquinone process are regenerated into the original alcohol components to thereby improve the production efficiency of hydrogen peroxide.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: November 27, 2018
    Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Hiroshi Hasegawa, Yukako Kozawa, Motoharu Takeuchi
  • METHOD FOR REGENERATING WORKING SOLUTION USED FOR PRODUCTION OF HYDROGEN PEROXIDE AND METHOD FOR PRODUCING HYDROGEN PEROXIDE USING REGENERATED WORKING SOLUTION
    Publication number: 20160200574
    Abstract: In the production of hydrogen peroxide, when ketone forms are increased upon conversion from higher alcohol components in organic solvents, such increased levels of ketone forms reduce the water content in a working solution and lead to deterioration of catalytic activity. Moreover, increased levels of ketone forms reduce the solubility of anthrahydroquinone compounds and may cause an obstacle to stable and safe operation in the production of hydrogen peroxide due to crystallization and deposition of the anthrahydroquinone compounds. The object of the present invention is to provide a process in which polar solvent-derived altered substances (ketone forms) in a working solution provided for use in the production of hydrogen peroxide via the anthraquinone process are regenerated into the original alcohol components to thereby improve the production efficiency of hydrogen peroxide.
    Type: Application
    Filed: August 8, 2014
    Publication date: July 14, 2016
    Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.
    Inventors: Hiroshi HASEGAWA, Yukako KOZAWA, Motoharu TAKEUCHI