Patents by Inventor Robert C. Zawalski

Robert C. Zawalski 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 preparing chlorofluorocarbons via an in situ generated activated aluminum trihalide catalyst and products resulting therefrom
    Patent number: 5017732
    Abstract: A process for isomerizing a chlorofluorocarbon of the formula:CClFYCClFXwherein X and Y are independently selected from chlorine and fluorine provided that X is not --Cl when Y is --Fto the compound of the formula:CCl.sub.2 YCF.sub.2 XThe process comprises contacting the chlorofluorocarbon with an activated aluminum trihalide catalyst. The catalyst is prepared by contacting the chlorofluorocarbon with anhydrous aluminum trichloride in the presence of a metal. The metal is selected from the group consisting of stainless steel, chromium, manganese, molybdenum, tungsten and combinations thereof.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: May 21, 1991
    Assignee: Dixie Chemical Company
    Inventor: Robert C. Zawalski
  • Process for preparing chlorofluorocarbons via an in situ generated activated aluminum trichloride catalyst and products resulting therefrom
    Patent number: 4925993
    Abstract: A process of isomerizing a chlorofluorocarbon of the formula: ##STR1## wherein X is chlorine or fluorine to the compound of the formula: ##STR2## The process comprises contacting the chlorofluorocarbon with an activated aluminum trichloride catalyst. The catalyst is prepared by contacting the chlorofluorocarbon with anhydrous aluminum trichloride in the presence of a metal. The metal is selected from the group consisting of stainless steel, chromium, manganese, molybdenum, tungsten and combinations thereof.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: May 15, 1990
    Assignee: Dixie Chemical Company
    Inventor: Robert C. Zawalski