Phthalic anhydride is the organic compound. It is the anhydride of phthalic acid. The chemical is a principal commercial form of phthalic acid. It was the first anhydride of a dicarboxylic acid to be used commercially. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. In 2000, the worldwide production volume was estimated to be about 3 million tonnes per year.
1. Phthalate plasticizers
2. Polyester fibers
3. Alkyd resins, polyester resins
5. Pharmaceutical products
6. Rubber industry