Process for exchanging dispersing medium of terephthalic acid sl

Details Process for exchanging dispersing medium of terephthalic acid sl Process for exchanging dispersing medium of terephthalic acid sl

1989-12-14

1991-04-16

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562414, 562416, 562417, 562486, C07C 5142

Patent

active

050084500

ABSTRACT:
A process for exchanging a dispersing medium of a terephthalic acid slurry by introducing an aliphatic carboxylic acid slurry of terephthalic acid into a multi-stage column at the upper part thereof and introducing water at the lower part thereof to form an upflowing stream of water in the multi-stage column, while a sedimentation of terephthalic acid particles is effected, and withdrawing an aqueous aliphatic carboxylic acid solution from the upper part of the multi-stage column and an aqueous slurry of terephthalic acid from the lower part of the multi-stage column.

REFERENCES:
patent: 3873609 (1975-03-01), Wu et al.
patent: 4212995 (1980-07-01), Shiraki
patent: 4357475 (1982-11-01), Hanotier et al.

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