Method of making oxydiphthalic anhydride

Details Method of making oxydiphthalic anhydride Method of making oxydiphthalic anhydride

1993-11-15

1994-08-09

Tsang, Cecila

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549250, C07D30789

Patent

active

053367880

ABSTRACT:
Disclosed is a method of making oxydiphthalic anhydride from oxydiphthalic acid. The oxydiphthalic acid is mixed with an organic liquid that codistills with water and the resulting slurry is heated to the boiling point of the slurry to remove any water. About 1 to about 4 moles of acetic anhydride per mole of oxydiphthalic acid are added to the slurry and the slurry is heated to a temperature between 50.degree. and 160.degree. C. until the oxydiphthalic acid content thereof is less than 0.1 weight percent. The slurry is filtered and the filter cake is heated to a temperature between about 180.degree. C. and below its melting point for about 12 to about 24 hours.

REFERENCES:
patent: 4808731 (1989-02-01), Berdahl et al.
patent: 5021168 (1991-06-01), Molinaro et al.
patent: 5077415 (1991-12-01), Jasne et al.
patent: 5145971 (1992-09-01), Lesins
patent: 5153335 (1992-10-01), Stults

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