phthalic anhydride

CAS No. 85-44-9

Formula: C8H4O3
Basic Info

Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. It is the anhydride of phthalic acid. Phthalic anhydride is a principal commercial form of phthalic acid. It was the first anhydride of a dicarboxylic acid to be used commercially. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. In 2000, the worldwide production volume was estimated to be about 3 million tonnes per year.

Formula
C8H4O3
Molecular Weight
148.116
Exact Mass
148.016
LogP
0.9972
PSA
43.37
Synonyms

1,3-dihydroisobenzofuran-1,3-dione

2,3-Dihydroimidazole-2-one

2,3-dihydro-1H-imidazol-2-one

1,3-dihydro-2h-imidazol-2-on

1,3-dihydro-2H-imidazol-2-one

Phthalic anhydride

1H-imidazol-2(3H)-one

o-Phthalic acid anhydride

shellsd-8591

isobenzofuran-1,3-dione

4-imidazolin-2-one

phthallic anhydride

2,3-DIHYDRO-IMIDAZOL-2-ONE

2(3H)-Oxo-1H-imidazole

sd8591

1,3-dihydroimidazolone

2-hydroxyimidazole

1,3-Isobenzofurandione

1,3-DIHYDRO-IMIDAZOL-2-ONE

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Properties
Appearance & Physical State
white crystalline solid with choking odour
Density
1.53
Boiling Point
284ºC
Melting Point
129-132ºC
Flash Point
152ºC
Refractive Index
1.646
Water Solubility
6 g/L (20 ºC)
Stability
Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, moisture, strong acids. Dust may form an explosive mixture with air.
Storage Condition
Store at RT.
Vapor Density
5.1 (vs air)
Vapor Pressure
<0.01 mm Hg ( 20 °C)
Safety Info
RTECS
TI3150000
Safety Statements
S22-S24/25-S26-S37/39-S46
WGK Germany
1
Risk Statements
R22; R37/38; R41; R42/43
HS Code
2917350000
RIDADR
UN 2214
Hazard Class
8
Packing Group
III
Hazard Codes
Spectrum
NMR Spectrum 1H NMR : 90 MHz in CDCl3
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IR Spectrum IR : KBr disc
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Mass Spectrum Mass
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