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Phthalic Anhydride

Phthalic Anhydride (CAS no: 85-44-9) is a organic compound with the chemical formula C6H4(CO)2O. The chemical appears to be in a colorless to white lustrous solid. It possess a pungent choking odor. Phthalic Anhydride is soluble in hot water, benzene, carbon disulfide, and alcohol and is slightly soluble in water and ether.



Phthalic anhydride suppliers and manufacturer synthesis the chemical by the oxidation of naphthalene in concentrated sulphuric acid in the occurrence of mercury sulphate. This route was later replaced by the catalytic vapour phase oxidation of naphthalene in air in the presence of a vanadium oxide catalyst.



  • Phthalic anhydride is used as an intermediate called phthalate esters used in the production of plastics from vinyl chloride.

  • Certain industries buy Phthalic anhydride used in industry for the production of certain dyes.

  • Phthalic anhydride treated with cellulose acetate to give out cellulose acetate phthalate (CAP), a common enteric coating excipient that has also been shown to have antiviral activity. Phthalic anhydride is a degradation product of CAP.

  • Phthalic anhydride has also been used as a rubber scorch inhibitor and retarder.

  • Paints and Coating industries buy Phthalic anhydride used in the production of polyester resins and other minor uses in the production of alkyd resins.

  • These are used in paints and lacquers, insect repellent and other urethane polyester polyols.

  • Phthalic anhydride suppliers and manufacturer supply the chemical to construction, marine and transportation which is used to blend glass fibers for the production of fibreglass reinforced in plastics.

  • People buy phthalic anhydride used in the production of “phthalate” plasticizers that are used to produce flexible PVC (Vinyl) products.



As per US EPA, exposure to phthalic anhydride might reason in irritation of the eyes, respiratory tract, and skin. Phthalic anhydride is a intoxicating to the skin and respiratory tract sensitizer. Researchers indicate that phthalic anhydride vapor reasons in congestion, irritation, and injury to lung cells.


Storage and Handling

Phthalic Anhydride suppliers and manufacturers should store the chemical in cool, properly covered, dry area, and away from direct sunlight. Ensure complete ventilation of stores and work areas. It is advisable to keep away from sources of ignition.

Phthalic Anhydride storage must avoid dust formation. As dust can form an explosive mixture with air. Prevent electrostatic charge that sources of ignition and should be kept well clear - fire extinguishers should be kept handy.


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