Patents Examined by Jose G. Dezs
  • Process for producing 2,6-naphthalenedicarboxylic acid
    Patent number: 5442103
    Abstract: A process for producing 2,6-naphthalenedicarboxylic acid by oxidizing 2,6-dimethylnaphthalene by molecular oxygen in the presence of a catalyst including cobalt, manganese and bromine. The oxidation reaction is performed by using a 2,6-dialkylnaphthalene mixture of 2,6-dimethynaphthalene and a small amount of 2,6-diisopropylnaphthalene as a raw material. Thus, the desired 2,6-naphthalenedicarboxylic acid can be produced at a high yield.
    Type: Grant
    Filed: November 16, 1993
    Date of Patent: August 15, 1995
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Hiroshi Iwane, Takahiro Sugawara, Katsufumi Kujira, Naoki Suzuki, Tomoya Sakata