Process for preparing 3,4,3,4-benzophenone-tetracarboxylic dianh

Details Process for preparing 3,4,3,4-benzophenone-tetracarboxylic dianh Process for preparing 3,4,3,4-benzophenone-tetracarboxylic dianh

Filed on

1978-07-03

Date issued

1979-11-06

Examiner

Raymond, Richard

Patent Class

Chemistry of carbon compounds

SubClass

Miscellaneous organic carbon compounds

SubSubClass

C-metal

Other Related Categories

C07D30789

Type

Patent

Status

active

Patent number

041735730

Description

ABSTRACT:
A process for preparing 3,4,3',4'-benzophenonetetracarboxylic dianhydride which comprises condensing an impure ortho-xylene mixture with acetaldehyde in contact with an acid catalyst to obtain an impure 1,1-bis(3,4-dimethylphenyl)ethane mixture, oxidizing the 1,1-bis(3,4-dimethylphenyl)ethane mixture with nitric acid to obtain a mixture of carboxylic acids, from which by crystallization and dehydration substantially pure 3,4,3',4'-benzophenonetetracarboxylic dianhydride is recovered.

REFERENCES:
patent: 3002034 (1961-09-01), Schulz et al.
patent: 3078279 (1963-02-01), McCracken et al.

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