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|1. (WO1994000413) METHOD FOR PREPARING AROMATIC CARBOXYLIC ACIDS|
|Inventors:||HOLZHAUER, Juergen, K.
HOOVER, Stephen, V.
SIKKENGA, David, L.
KUHLMANN, George, E.
BEHRENS, Paul, K.
ZEITLIN, Martin, A.
|Title:||METHOD FOR PREPARING AROMATIC CARBOXYLIC ACIDS|
Disclosed is a method for preparing an aromatic carboxylic acid comprising oxidizing in the liquid phase an aromatic feed compound containing at least one alkyl or acyl group with a molecular oxygen-containing gas, in a solvent comprising a low molecular weight aliphatic carboxylic acid, and in the presence of a heavy metal oxidation catalyst, thereby forming an oxidation reaction product mixture comprising an aromatic carboxylic acid; subsequently heating the oxidation reaction product mixture at a temperature of at least about 500 °F (260 °C) to form a second product mixture; and recovering from the second product mixture the aromatic carboxylic acid. The method of this invention provides for purer, larger particle size aromatic carboxylic acid product.