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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.

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Description

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.

Applications
  • Alkyd resins
  • Plasticizers (DINP, DOP, DBP)
  • Unsaturated polyester resins
  • Dyes and pigments
  • Polyester polyols
  • Halogenated anhydrides
  • Pharmaceutical industry
Technical characteristics

Property

Typical Value

Appearance

White flake and powder or melt

Mass fraction of phthalic anhydride, % min

99,9

Crystallization point, oC min

130,9

Mass fraction of phthalic acid,

Absence

Mass fraction of maleic anhydride, % max

0,05

Mass fraction of ash, % max

0,002

Mass fraction of iron, % max

0,0002

Chromaticity of molten product, Hasen units

15

Chromaticity of molten product after heating at 250 degr. Co for 90 min, Hasen units

30


The certificate of analysis (COA) per each shipped lot number is issued in compliance with Russian standard GOST 7119-77.