Patents by Inventor David B. Raju

David B. Raju 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 PREPARING AROMATIC CARBOXYLIC ACIDS FROM ALKYLAROMATICS BY LIQUIE-PHASE OXIDATION
    Publication number: 20020193631
    Abstract: The present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by liquid-phase oxidation. More particularly, the present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by oxidation in acetic acid as solvent with oxygen-containing gas in the presence of cobalt/manganese/bromine complex catalyst, wherein nickel and carbon dioxide in an appropriate amount are added to increase an activity of cobalt/manganese/bromine complex catalyst. Especially nickel has a synergistic effect with carbon dioxide and maximize the formation of the desired product having the corresponding carboxylic groups to the number of alkyl groups in a reactant.
    Type: Application
    Filed: September 28, 2001
    Publication date: December 19, 2002
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Sang-Eon Park, Jin S. Yoo, Ki-Won Jun, David B. Raju, Young-Ho Kim
  • Method for preparing aromatic carboxylic acids from alkylaromatics by liquid-phase oxidation
    Patent number: 6476257
    Abstract: The present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by liquid-phase oxidation. More particularly, the present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by oxidation in acetic acid as solvent with oxygen-containing gas in the presence of cobalt/manganese/bromine complex catalyst, wherein nickel and carbon dioxide in an appropriate amount are added to increase an activity of cobalt/manganese/bromine complex catalyst. Especially nickel has a synergistic effect with carbon dioxide and maximize the to formation of the desired product having the corresponding carboxylic groups to the number of alkyl groups in a reactant.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: November 5, 2002
    Assignee: Korea Institute of Chemical Technology
    Inventors: Sang-Eon Park, Jin S. Yoo, Ki-Won Jun, David B. Raju, Young-Ho Kim