Rate of crystallizing diphenylisophthalate/diphenylterephthalate

Details Rate of crystallizing diphenylisophthalate/diphenylterephthalate Rate of crystallizing diphenylisophthalate/diphenylterephthalate

1986-03-14

1988-01-19

Lone, Werren B.

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

Organic compounds

Carboxylic acid esters

562486, C07C 6752

Patent

active

047205709

ABSTRACT:
A process for improving the rate of crystallization of a diphenylisophthalate/diphenylterephthalate monomer. The process comprises dissolving the monomer in an organic solvent, filtering the solution to remove impurities, and crystallizing the monomer to remove impurities. The precipitated monomer is then separated from the solvent by a centrifuge and dried. The monomer has a desired crystal size of about 2 mm. The process also is more efficient in that it reduces scaling inside the reactor system.

REFERENCES:
patent: 2656377 (1953-10-01), Pino
patent: 3836573 (1974-09-01), Schreiber et al.

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