Patents Assigned to Produits Chimiques Uging Kuhlmann
  • Process for the preparation of epsilon-caprolactone
    Patent number: 4994583
    Abstract: Process for manufacturing .SIGMA.- caprolactone by oxidation of cyclohexanone by means of a crude C.sub.2 -C.sub.4 percarboxylic acid solution, resulting from the reaction of hydrogen peroxide on the corresponding carboxylic acid in the presence of a weak acid catalyst, with continuous elimination of water by azeotropic entrainment, characterized in that the molar ratio of cyclohexanone used to the percarboxylic acid is between about 0.50 to 0.99.
    Type: Grant
    Filed: July 12, 1989
    Date of Patent: February 19, 1991
    Assignee: Produits Chimiques Uging Kuhlmann
    Inventors: Michele Pralus, Jean-Claude Lecoq, Jean-Pierre Schirmann