Extraction process for removal of impurities from terephthalic a

Details Extraction process for removal of impurities from terephthalic a Extraction process for removal of impurities from terephthalic a

1989-06-05

1990-07-03

Lone, Werren B.

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

Organic compounds

Carboxylic acids and salts thereof

562414, C07C 5143

Patent

active

049392972

ABSTRACT:
A method for removing impurities from an oxidative terephthalic acid synthesis mother liquor containing acetic acid, water, corrosion metals, a metal catalyst and organic impurities, comprising the steps of (a) removing from the mother liquor by evaporation from 50-95% of the acetic acid and water contained therein; (b) adding an amount of water to the concentrated mother liquor sufficient to dissolve the metal catalyst and form an aqueous mixture; (c) extracting the aqueous mixture by counter-current extraction with a substantially water-insoluble organic solvent, to produce a lighter phase containing the organic solvent, a minor amount of the water, acetic acid and the organic impurities and a heavier phase containing a major amount of the water, corrosion metals and the metal catalyst, and; (d) removing the corrosion metals from the heavier phase by heating and filtering, and; (e) removing the organic impurities from the lighter phase by distillation.

REFERENCES:
patent: 3673154 (1972-06-01), Trevillyan
patent: 4340752 (1982-07-01), List et al.
patent: 4356319 (1982-10-01), Roffia et al.

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