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phthalic anhydride

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Origin: China

Cas No: 85-44-9

Specification: 99%min

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CAS No.: 85-44-9 Formula: C8H4O3 Molecular Weight: 148.11600

Description

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.

Basic Info

Chemical Name	phthalic anhydride
Synonyms	1,3-DIHYDRO-IMIDAZOL-2-ONE; 1,3-Isobenzofurandione; 2-hydroxyimidazole; 1,3-dihydroimidazolone; sd8591; 2(3H)-Oxo-1H-imidazole; 2,3-DIHYDRO-IMIDAZOL-2-ONE; phthallic anhydride; 4-imidazolin-2-one; isobenzofuran-1,3-dione; shellsd-8591; o-Phthalic acid anhydride; 1H-imidazol-2(3H)-one; Phthalic anhydride; 1,3-dihydro-2H-imidazol-2-one; 1,3-dihydro-2h-imidazol-2-on; 2,3-dihydro-1H-imidazol-2-one; 2,3-Dihydroimidazole-2-one; 1,3-dihydroisobenzofuran-1,3-dione;
CAS No.	85-44-9
Molecular Formula	C8H4O3
Molecular Weight	148.11600
PSA	43.37000
LogP	0.99720

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
Hazard Class	8
Safety Statements	S22-S24/25-S26-S37/39-S46
HS Code	2917350000
WGK Germany	1
Packing Group	III
RIDADR	UN 2214
Risk Statements	R22; R37/38; R41; R42/43
Hazard Codes	Xn

Synthesis Route

N,N-dimethylformamide+Phthaloyl dichloride→phthalic anhydride+(Chloromethylene)dimethyliminium chloride
2-benzofuran-1(3H)-one+Phthaloyl dichloride→phthalic anhydride+2-(Chloromethyl)benzoyl chloride
2-tert-butylnaphthalene→maleic anhydride+phthalic anhydride

Precursor

N,N-dimethylformamide
phthalic acid
1,3-Dihydroisobenzofuran
1,3-Diphenylisobenzofuran

Downstream Product

2-(4-fluoro-5,6,7,8-tetrahydronaphthalene-1-carbonyl)benzoic acid
3-[(3-methylphenyl)methylidene]-2-benzofuran-1-one
2-(4-methoxyanilino)isoindole-1,3-dione
2-[6-(1,3-dioxoisoindol-2-yl)hexyl]isoindole-1,3-dione

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