Patent ID: 9394223
Filing Date: 2016-07-19
CPC Classification: C07C

Claim Text:
1. A process, comprising: (a) oxidizing a feedstock comprising an alkyl aromatic compound to form a first crude aromatic carboxylic acid reaction product; (b) oxidizing the first crude aromatic carboxylic acid reaction product in one or more sequential reaction mixtures to form a second crude aromatic carboxylic acid reaction product, wherein the second crude aromatic carboxylic acid reaction product comprises 3000 ppm by weight (ppmw) to 10,000 ppmw of aldehyde intermediate reaction products; (c) contacting an aqueous reaction mixture comprising the second crude aromatic carboxylic acid reaction product with an oxygen source in the presence of an oxidation catalyst comprising at least one of Ru, Au, Pt, Ir and V, and oxides, alloys, salts and mixtures thereof, to form a third crude aromatic carboxylic acid reaction product, wherein the second crude aromatic carboxylic acid reaction product comprises 3000 ppmw to 6,000 ppmw of aldehyde intermediate reaction products; and (d) purifying the third crude aromatic carboxylic acid reaction product with hydrogen to form purified aromatic carboxylic acid, wherein the purified aromatic carboxylic acid has less than 100 ppmw aldehyde intermediate reaction products.