Recovery of ester monomer from polyester resins

Details Recovery of ester monomer from polyester resins Recovery of ester monomer from polyester resins

1996-07-10

1999-09-14

Barts, Samuel

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

Organic compounds

Carboxylic acid esters

560 96, C07C 6760

Patent

active

059525207

ABSTRACT:
There is described a process for improving the yield of diester monomer recovered from the depolymerization of polyethylene terephthalate by converting a mixture of dimethyl terephthalate and methylhydroxyethyl terephthalate to predominantly dimethyl terephthalate by treating that mixture with a mixture of an alcohol and an alkali metal hydroxide at a temperature up to the boiling point of the alcohol.

REFERENCES:
patent: 3949007 (1976-04-01), Grolig et al.
patent: 4163860 (1979-08-01), Delattre et al.
patent: 5051528 (1991-09-01), Naujokas et al.
patent: 5298530 (1994-03-01), Gamble et al.
patent: 5393916 (1995-02-01), Gamble et al.
patent: 5414022 (1995-05-01), Toot, Jr. et al.

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