Ethylene glycol recovery process

Details Ethylene glycol recovery process Ethylene glycol recovery process

1993-05-06

1994-03-15

Bascomb, Jr., Wilbur

Distillation: processes, separatory

With chemical reaction

203 38, 203 41, 203 47, 203DIG25, 568871, 568872, B01D 314, B01D 1504, C07C 2974

Patent

active

052943054

ABSTRACT:
The present invention is an improved process for the recovery of ethylene glycol from spent glycol generated in the manufacture of polyethylene terephthalate. The spent glycol typically consists of metal oxide catalyst residues, low molecular weight terephthalate oligomers, diethylene glycol and other trace impurities. The improved process of the present invention is based on the principle that elevating the temperature of the spent glycol increases the solubility of the low molecular weight oligomers so that the low molecular weight oligomers can be dissolved in the ethylene glycol and further that the spent glycol at an elevated temperature may be passed through an ion exchange bed to remove metal oxide catalysts, color forming impurities and other trace impurities.

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EG Purification Plant Test--Old Hickory Plant, Final Report, Oct. 27, 1992.
European patent Application, Publication No. 0463762A2.

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