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The largest markets for phthalic anhydride are phthalate plasticizers, unsaturated polyester resins, and alkyd resins for surface coatings. Commercial phthalic anhydride is 99.8–99.9% pure (99.5% is generally guaranteed) and is available in two forms—flake and molten. Most worldwide consumption of phthalic anhydride is molten.

The generated process of fumaric acid sludge (FAS) is shown in Figure 1. A plant producing about 150,000 tons of phthalic anhydride will generate about 4000 tons of by-product FAS every year.

Phthalic anhydride is an organic compound, C8H4O3, which is a circular anhydride formed by the dehydration of phthalic acid molecules. Phthalic anhydride is a white solid, it is an important raw material in the chemical industry, especially used in plasticizer manufacture. HS code for PA is 2917350000.

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Thirumalai Chemicals Limited. Thirumalai Chemicals Limited (TCL) is a publicly listed company in India. TCL ranks among the largest producers in the world of Phthalic Anhydride, Malic Acid, Maleic Anhydride and Fumaric Acid. As a Responsible Care Company, safety, integrity and people are their main pillars.