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Name of a product: Phthalic Anhydride (A technical grade).Chemical name (on IUPAC): 1, 3-Dihydro-2-benzofuran-1, 3-dione.Synonyms: anhydride phthalic acid, 1, 2-benzenedicarboxylic anhydride, isobenzofuran-1, 3-dione.Empirical formula: С8H4O3.GOST 7119-77.CAS-number: 85-44-9.EINECS-number: 201-607-5. Phthalic anhydride (A technical grade) is manufactured from ortho-xylene by air catalytic oxidation in gas phrase with vanadium-titanium catalyst.Usage of Phthalic anhydride (A technical grade): raw material in the production of alkyd resins, phthalate plasticizers (DINP, DOP, DBP etc.), polyester resins, dyestuffs, tyres and technical rubber products, a range of pharmaceuticals and other products. Phthalic Anhydride chemicals