Process for the purification of crude trimellitic anhydride

Details Process for the purification of crude trimellitic anhydride Process for the purification of crude trimellitic anhydride

1974-10-29

1976-04-06

Randolph, John D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30789

Patent

active

039489566

ABSTRACT:
Commercial grade crude trimellitic acid anhydride containing free trimellitic acid and other impurities is purified by forming a suspension of the trimellitic acid anhydride in a mixture of acetic acid anhydride, acetic acid and benzene at a temperature of about the boiling point of the mass, the acetic acid anhydride being used in an excess up to about 200% by weight over the stoichiometric amount and the benzene being used in an amount up to 6 times the weight of the anhydride and recovering the purified trimellitic acid anhydride from the mass.

REFERENCES:
patent: 2888465 (1959-05-01), Hodes

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