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Phthalic anhydride is a chemical compound, which is a cyclic anhydride formed by the dehydration of phthalic acid molecules. Phthalic anhydride is a white solid, an important raw material in the chemical industry, especially for the manufacture of plasticizers. It is widely used in the production of plasticizers and pigments, and can also be used as a scorch retarder, light stabilizer and heat stabilizer.

1. Industrial production of phthalic acid

(1) In industry, o-methyl formic acid, o-xylene or naphthalene are often used as raw materials and prepared by vanadium pentoxide catalytic oxidation.

(2) Phthalic acid can be obtained by hydrolysis of phthalic anhydride, or by oxidation of o-xylene or o-toluic acid.

(3) In the presence of cerium salt or thorium salt, phthalic acid can be obtained by oxidizing naphthalene with fuming sulfuric acid or electrolyzing naphthalene.

(4) Phthalic acid can form phthalic acid monoester and diester, and it can also undergo substitution reaction on the benzene ring.

(5) Since phthalic acid and phthalic anhydride have similar chemical properties, phthalic anhydride is often directly produced in industry.

2. Industrial use of phthalic acid

Phthalic acid is used in the preparation of dyes, polyester resins, polyester fibers, medicines and plasticizers. In applications, phthalic anhydride can be used instead of phthalic acid. Phthalic acid is a raw material for synthetic resins, fibers, medicines, etc. It is an important organic industrial product, used as a gas chromatography reference substance and an analytical reagent for certain metals.

Phthalic anhydride is formed after dehydration of phthalic acid, which is an important raw material for the polyurethane industry. Its products are used in the production of polyurethane insulation materials, and the performance is better than that of polyether.

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