Process for separating mixture of ethylene glycol and dimethyl t

Details Process for separating mixture of ethylene glycol and dimethyl t Process for separating mixture of ethylene glycol and dimethyl t

1993-05-24

1994-11-15

Richter, Johann

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

Organic compounds

Oxygen containing

528490, C07C 2726, C07C 2974

Patent

active

053649850

ABSTRACT:
A process for separating ethylene glycol from a mixture of ethylene glycol and dimethyl terephthalate polymers is described. The mixture is comminuted, mixed with water, and agitated at a high fluid shear rate to disperse the polymers. A flocculant and, optionally, a filter aid are added to the mixture. Thereafter, the dimethyl terephthalate polymers are separated from the mixture. The process produces a commercially valuable ethylene glycol stream. The separated dimethyl terephthalate polymers are recovered in a form which facilitates disposal or, alternatively, re-use.

REFERENCES:
patent: 3458583 (1969-07-01), Taul et al.
patent: 4066835 (1978-01-01), Hahn et al.
patent: 4076946 (1978-02-01), Millick, III
patent: 4241216 (1980-12-01), Bergman et al.
patent: 4929749 (1990-05-01), Gupta et al.
patent: 5051528 (1991-09-01), Naujokas et al.
CA 83(21):178586x, Matsuura et al, BisCibeta.-hydroxyethyl terephthalate and dimethyl terephthalate, 1975.

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