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289 results about "Phthalic acid" patented technology

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Phthalic acid is an aromatic dicarboxylic acid, with formula C₆H₄(CO₂H)₂. It is an isomer of isophthalic acid and terephthalic acid. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale.