Method for recovering bis hydroxy aromatic organic values and bi

Details Method for recovering bis hydroxy aromatic organic values and bi Method for recovering bis hydroxy aromatic organic values and bi

1993-09-07

1994-08-09

Lone, Werren B.

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

Organic compounds

Oxygen containing

568724, 568749, 558260, 558265, 558268, C07C 3770, C07C 3774

Patent

active

053368142

ABSTRACT:
A method is provided for depolymerizing scrap aromatic polycarbonate to salvage component monomers by initially effecting aromatic polycarbonate depolymerization by basic phenolysis to produce a mixture having dihydric phenol, and diarylcarbonate. Recovery of the dihydric phenol is effected by distillation of a crystalline dihydric phenol/phenol adduct. Diarylcarbonate is recovered by distillation of the resulting mother liquor after carboxylic acid treatment.

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patent: 4212774 (1980-07-01), Oota
patent: 4478510 (1986-03-01), Doerr
patent: 4605762 (1986-08-01), Mandoki
patent: 4885407 (1989-12-01), Fox et al.
patent: 5045122 (1991-09-01), Tindall et al.

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