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.
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.
|
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.
