Process for depolymerizing waste ethylene terephthalate polyeste

Details Process for depolymerizing waste ethylene terephthalate polyeste Process for depolymerizing waste ethylene terephthalate polyeste

1976-01-09

1978-03-07

Myers, Jane S.

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

Organic compounds

Carboxylic acid esters

260 23, 560 96, C07C 6982, C07C 6748, C07C 6700

Patent

active

040781437

ABSTRACT:
Recovery of ethylene terephthalate polymer from waste material is accomplished by glycolysis of the polyester to form bis-(2-hydroxyethyl)terephthalate for repolymerization. Formation of objectionable diethylene glycol is inhibited when glycolysis is accomplished by heating the polyester in a reaction mixture with bis-(2-hydroxyethyl)terephthalate, ethylene glycol and sodium acetate trihydrate, and water is introduced continuously into the reaction mixture during depolymerization of the polyester.

REFERENCES:
patent: 3057909 (1962-10-01), Sebelist et al.
patent: 3830759 (1974-08-01), Barkley
patent: 3884850 (1975-05-01), Ostrowski

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