Title:
METHOD FOR OXIDIZING 1,1-BIS-(3,4-DIMETHYLPHENYL)-ALKANE INTO 3,3',4,4'-BENZOPHENONE TETRACARBOXYLIC ACID
Document Type and Number:
Japanese Patent JP2021095389
Kind Code:
A
Abstract:
To provide a method for producing 3,3',4,4'-benzophenone tetracarboxylic acid by nitric acid oxidation of a 1,1-bis-(3,4-dimethylphenyl)-alkane, which reduces or prevents discharge of nitric oxide and avoids the risk of oxygen inhibiting the nitric acid oxidation.SOLUTION: The method comprises: reacting the 1,1-bis-(3,4-dimethylphenyl)-alkane or a partial oxidation product thereof with nitric acid in a pressure vessel at a temperature from 120 to 220°C to produce 3,3',4,4'-benzophenone tetracarboxylic acid with production of nitric oxide; passing the nitric oxide from the pressure vessel into an absorption vessel; and reacting the nitric oxide in the absorption vessel with molecular oxygen and water to produce an aqueous nitric acid solution.SELECTED DRAWING: None
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Inventors:
HARALD ROGL
Application Number:
JP2020190989A
Publication Date:
June 24, 2021
Filing Date:
November 17, 2020
Export Citation:
Assignee:
EVONIK FIBRES GMBH
International Classes:
C07C51/275; C07C65/34; C07D307/90
Attorney, Agent or Firm:
Patent Business Corporation Ashitaba International Patent Office