Phthalic anhydride
Maleic anhydride
2-ethylhexyl
Fumaric acid

Phthalic anhydride 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 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

-

-

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