Process for preparation of crude terephthalic acid suitable...

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

C - Chemistry, Metallurgy

07

C

C07C 63/00 (2006.01) C07C 51/265 (2006.01) C07C 51/43 (2006.01)

Patent

CA 2108269

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 plastics bottles.

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