Process for the preparation of monomeric terephthalic diesters a

Details Process for the preparation of monomeric terephthalic diesters a Process for the preparation of monomeric terephthalic diesters a

1993-08-16

1996-01-02

Dees, Jose G.

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

Organic compounds

Carboxylic acid esters

560 98, C07C 6748

Patent

active

054810248

ABSTRACT:
The invention relates to a novel process for the preparation of terephthalic diesters and diols from polyesters. The process comprises depolymerization of the polyester in the presence of transesterification catalysts for said polyester and in the presence of an ester and subsequent transesterification of the reaction mixture to give the terephthalic diester by reaction with a monohydric alcohol. The novel process allows the starting components of polyesters to be recovered rapidly and under mild reaction conditions.

REFERENCES:
patent: 2884443 (1959-04-01), Siggel et al.
patent: 3037050 (1962-05-01), Heisenberg et al.
patent: 3257335 (1966-06-01), Whitfield et al.
patent: 3321510 (1967-05-01), Lotz et al.
patent: 3776945 (1973-12-01), Ligorati et al.
patent: 5051528 (1991-09-01), Naujokas et al.

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