Patents Examined by Werren D. Lone
  • Method of preparing fluorine-containing ethane derivatives
    Patent number: 5214223
    Abstract: A method of preparing fluorine-containing ethane derivatives using a catalyst mixture which comprises a metal halide and a sulfonic acid derivative is described. The method is particularly well suited for preparing CF.sub.3 CHCl.sub.2 (R123) from perchloroethylene and for preparing CF.sub.3 CH.sub.2 F (R134a) from trifluoroethylene.
    Type: Grant
    Filed: July 14, 1992
    Date of Patent: May 25, 1993
    Assignee: Kali-Chemie AG
    Inventors: Johannes Eicher, Karlheinz Fazniewscy, Werner Rudolph, Hans-Walter Swidersky