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China and India are the leading exporters of phthalic acid, accounting for a substantial share of global supply, while the United States, Germany, and South Korea are the largest importers, reflecting strong demand from downstream industries such as plasticizers and polyester resins. Exports from China have remained dominant but moderated slightly amid tightening environmental regulations, while Phthalic acid prices have shown modest upward pressure in 2023–2024 due to feedstock cost volatility and regional supply constraints.
Phthalic acid is a white crystalline solid with a faint, characteristic odor and a melting point of approximately 207 °C; it decomposes before boiling and exhibits low volatility under ambient conditions. It is an aromatic dicarboxylic acid and a key organic chemical intermediate. Industrially, it is primarily used in the production of phthalic anhydride via dehydration, serving as a precursor to plasticizers (e.g., di(2-ethylhexyl) phthalate), unsaturated polyester resins, and alkyd resins. Its derivatives are widely employed in polymers, coatings, adhesives, and printing inks.
It is a dibasic acid, with pKa's of 2.89 and 5.51. The mono potassium salt, potassium hydrogen phthalate is a standard acid in analytical chemistry. Typically phthalate esters are prepared from the widely available phthalic anhydride. Reduction of phthalic acid with sodium amalgam in the presence of water gives the 1,3- cyclohexadiene derivative.
This chemical is included in Fine Chemicals. See more about what is Phthalic acid and Phthalic acid SDS information.
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