Patent ID: 7846700

Claim:
A method for purifying crude naphthalene dimethylcarboxylic acid, comprising: reacting crude naphthalene dimethylcarboxylic acid with a transformant, prepared by constructing a recombinant expression vector carrying the gene of SEQ ID NO:1 encoding benzaldehyde dehydrogenase (xylC) obtained from Sphingomonas aromaticivorans KCTC 2888, and transforming an E. coli host cell with the recombinant expression vector; wherein the reacting of the crude naphthalene dimethylcarboxylic acid with the transformant results in the conversion of 2-formyl-6-naphthoic acid contained within the crude naphthalene dimethylcarboxylic acid into 2,6-naphthalene dicarboxylic acid.