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 Phthalic anhydride
Phthalic anhydride is an important organic chemical raw material which is mainly used to make plasticizer in plastic, alkyd resin, dye, unsaturated resin and some medicines or farm chemicals.
molecular formula :C8H4O3
molecular weight :148.12
Quality standards of phthalic anhydride
property
|
specification |
excellent |
frist grade |
qualified |
| appearance |
white scale-shaped or crystal powder |
white scale-shaped or crystal powder tinged with other colour |
| molten colour≤ |
20 |
50 |
100 |
| molten clour after heating ≤ |
50 |
150 |
- |
| solidification point ≥ °C |
130.5 |
130.3 |
130.0 |
| purity% ≥ |
99.5 |
99.5 |
99.0 |
| free acid content ≤ % |
0.5 |
0.5 |
0.5 |
| ash% ≤ |
0.05 |
- |
- |
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