Patent ID: 9499465
Filing Date: 2016-11-22
CPC Classification: C07C,C08G

Claim Text:
1. A method for producing terephthalic acid, isophthalic acid or both terephthalic acid and isophthalic acid, comprising: (a) reacting isoprene with acrylic acid in the presence of a first catalyst to form a first product selected from the group consisting of 4-methyl-3-cyclohexene-1-carboxylic acid, 3-methyl-3-cyclohexene-1-carboxylic acid, and mixtures thereof; (b) performing an aromatization reaction on the first product to form a second product selected from the group consisting of para-toluic acid, meta-toluic acid, and mixtures thereof; and (c) performing an oxidation reaction on the second product in the presence of a third catalyst to form terephthalic acid, isophthalic acid, or mixtures thereof.