Phthalic anhydride

Application Fields

Plasticizer Production:

Core Application: Accounts for 60% of phthalic anhydride consumption. Mainly used to synthesize Dioctyl Phthalate (DOP), Dibutyl Phthalate (DBP), etc., for softening Polyvinyl Chloride (PVC) plastics. Widely used in pipes, films, wires, and cables.

Resin Synthesis:

Unsaturated Polyester Resin: Used in fiberglass, coatings, artificial stone, etc.;

Alkyd Resin: Used in paints and inks to improve weather resistance and gloss.

Fine Chemicals:

Pharmaceutical Field: Synthesis of the laxative phenolphthalein and antibiotic intermediates;

Pesticide Field: Production of the insecticide phosmet and the herbicide bentazone;

Dyes and Pigments: Synthesis of phthalocyanine blue and anthraquinone dyes.

Other Uses:

Raw materials for saccharin sodium and food additives;

Epoxy resin curing agents and rubber scorch retarders.

CAS NO: 85-44-9

EC NO: 201-607-5

Molecular Formula: C₈H₄O₃

Molecular Weight: 148.12

Alias: Phthalic anhydride; Phthalic anhydride;

Structural Formula: