Process for preparation of crude terephthalic acid suitable for

Details Process for preparation of crude terephthalic acid suitable for Process for preparation of crude terephthalic acid suitable for

1992-01-15

1993-04-06

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562414, 562487, 562608, C07C 5143

Patent

active

052005577

ABSTRACT:
A process is disclosed for counter-current positive displacement of an aliphatic carboxylic acid of 1 to 5 carbon atoms from a filter cake of an aromatic polycarboxylic acid containing the aliphatic carboxylic acid wherein mother liquor retained by the aromatic polycarboxylic acid has a concentration of the aliphatic carboxylic acid of 5000 ppmw, or less, based upon weight of the aromatic polycarboxylic acid present. This method is useful for the manufacture of crude terephthalic acid which is used after purification for the preparation of polyesters used for the manufacture of fabrics, fibers and plastic bottles.

REFERENCES:
patent: 3584039 (1971-06-01), Meyer
patent: 4314073 (1982-02-01), Crooks
patent: 4438279 (1984-03-01), Packer et al.
patent: 4485244 (1984-11-01), Fox et al.

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