Amoco Corporation

John C Gee

Calvin T Chew

Jeffrey I Rosenfeld

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.

Process for preparation of crude terephthalic acid suitable for

A method for the continuous, catalytic production of an aromatic carboxylic acid product by liquid-phase, exothermic oxidaion of an aromatic alkyl with an oxygen-containing gas and a solvent medium in an oxidation reactor and utilizing reverse osmosis is disclosed. In particular, a multiple ingredient or component-containing slurry product stream is withdrawn from the reactor, the slurry product stream is then separated to produce a product-containing stream and at least one mother liquor stream which contains, in addition to a number of desirable process stream components, such as oxidation reaction catalysts, a number of undesirable process stream impurities. The impurities are selectively removed from the mother liquor stream by passing at least a portion of the mother liquor stream through a reverse osmosis separation device to produce a catalyst-bearing stream having a relatively lesser impurities-to-catalyst weight ratio and a purge stream having a relatively greater impurities-to-catalyst weight ratio.

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Aurora, IL, United States of America

John C Gee