Trimellitic anhydride purification process

Details Trimellitic anhydride purification process Trimellitic anhydride purification process

1988-02-25

1989-01-10

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30789

Patent

active

047974974

ABSTRACT:
A process for the purification of trimellitic anhydride is disclosed herein in which molten trimellitic anhydride is mixed with pseudocumene at a temperature of about 200.degree. F. to about 450.degree. F. and wherein the purified trimellitic anhydride is recovered by crystallization from the pseudocumene mother liquor. The recovered trimellitic anhydride is further washed and dried. Trimellitic anhydride is useful in the manufacture of amide imide resins and various polyester.

REFERENCES:
patent: 2971011 (1961-02-01), Liao et al.
patent: 3161658 (1964-12-01), Meyer
patent: 4587350 (1986-05-01), Kilner et al.

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