Phthalic anhydride is an organic compound with the chemical formula C8H4O3. It is a cyclic anhydride formed by dehydration of phthalic acid molecules. It is a white crystalline powder, insoluble in cold water, slightly soluble in hot water, ether, soluble in ethanol, pyridine, benzene, carbon disulfide, etc. It is an important organic chemical raw material. It is an important intermediate for the preparation of phthalate plasticizers, coatings, saccharin, dyes and organic compounds.

Phthalic anhydride can undergo hydrolysis, alcoholysis and ammonolysis reactions, and react with aromatics to synthesize anthraquinone derivatives. Phthalic anhydride can be used instead of phthalic acid, mainly reacting with mono alcohols to form esters, such as dibutyl phthalate, dioctyl phthalate.

【 Use 1 】
As an analytical reagent, it is also used in organic synthesis
【 Use 2 】
It is one of the important organic chemical raw materials, used in the production of plasticizer, alkyd resin, unsaturated polyester resin, dyes and pigments, medicine and pesticides
【 Use 3 】
Phthalic anhydride, referred to as phthalic anhydride, is an intermediate of fungicide germicide, insecticide thionimide and herbicide fenoxon.
【 Use 4 】
Phthalic anhydride is one of the most important organic chemical raw materials, its main derivatives are dibutyl phthalate, dioctyl ester and diisobutyl ester, etc., used as a plasticizer for PVC. It can also be used in the production of unsaturated polyester resin, alkyd resin, dyes and pigments, a variety of paints, food additives, laxative agent phenolphthalein in medicine, phosphorous imide in pesticides, chloroxone and saccharin sodium, etc.
【 Use 5 】
A standard solution for calibrating bases, separating primary alcohols from secondary alcohols and tertiary alcohols. The primary amines and aromatic hydrocarbons are identified according to the solubility points of derivatives. Remove thiophene from benzene.

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Store in a cool, dry, well-ventilated warehouse. Keep away from fire and heat. The package must be sealed and protected from moisture. It should be stored separately from oxidants, reducing agents, acids and bases, and should not be mixed. Equipped with the corresponding variety and quantity of fire equipment. Storage areas should be equipped with suitable materials to contain leaks.