Synthesis of biobased and substituted terephthalic acids and isophthalic acids

摘要

Methods for producing bio-terephthalic acid and bio-isophthalic acid are provided. The methods comprise a cycloaddition reaction to produce bio-4-methyl-3-cyclohexene-1-carboxylic acid, and bio-3-methyl-3-cyclohexene-1-carboxylic from bio-isoprene and bio-acrylic acid. An aromatization reaction produces bio-para-toluic acid and bio-meta-toluic acid from the bio-4-methyl-3-cyclohexene-1-carboxylic acid, and bio-3-methyl-3-cyclohexene-1-carboxylic. An oxidation reaction produces the bio-terephthalic acid and iso-phthalic acid from the bio-para-toluic acid and bio-meta-toluic acid.

主权项

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.