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 GB/T 15336-2006
molecular formula :C8H4O3
molecular weight :148.12
Quality standards of phthalic anhydride GB/T 15336-2006
|
Item
|
Index
|
||
|
Top grade
|
First grade
|
Qualified product
|
|
|
Appearance
|
white scaly or crystalline powder
|
white scaly or crystalline powder with slight colors
|
|
|
molten Chroma(Chroma no. )≤
|
20
|
50
|
100
|
|
thermostable Chroma(Chroma no. )≤
|
50
|
150
|
-
|
|
Chroma of vitriol(Chroma no. )≤
|
60
|
100
|
150
|
|
crystallization point°C≥
|
130.5
|
130.3
|
130.0
|
|
Purity(mass fraction)%≥
|
99.50
|
99.50
|
99.00
|
|
Free acid(mass fraction)≤ %
|
0.20
|
0.30
|
0.50
|
|
Ash(mass fraction)%≤
|
0.05
|
-
|
-
|