Patents Assigned to Ciba Specialty Chemcals Corporation
  • Process for preparing sparingly soluble aromatic amines
    Patent number: 6087480
    Abstract: Preparation of sparingly soluble aromatic amines by catalytic hydrogenation of the corresponding aromatic nitro compounds in the presence of hydrogen, a solvent and a catalyst having a particle size of not less than 0.5 mm, wherein the aromatic nitro compound selected is a compound whose corresponding amine is soluble to an extent of not more than 50% by weight in the solvent used under the reaction conditions of the hydrogenation, and also their use for preparing azo compounds.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: July 11, 2000
    Assignee: Ciba Specialty Chemcals Corporation
    Inventor: Bernd Lamatsch