Phthalic anhydride, the anhydride form of phthalic acid, is manufactured from orthoxylene by air catalytic oxidation in gas phrase with vanadium-titanium catalyst. At room temperature it forms white crystals like flakes. In contact with water it results phthalic acid.
Plasticizers (DINP, DOP, DBP)
Unsaturated polyester resins
Dyes and pigments
White flake and powder or melt
Mass fraction of phthalic anhydride, % min
Crystallization point, oC min
Mass fraction of phthalic acid,
Mass fraction of maleic anhydride, % max
Mass fraction of ash, % max
Mass fraction of iron, % max
Chromaticity of molten product, Hasen units
Chromaticity of molten product after heating at 250 degr. Co for 90 min, Hasen units
The certificate of analysis (COA) per each shipped lot number is issued in compliance with Russian standard GOST 7119-77.
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