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Phthalic anhydride

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.

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Further Information

Names

Preferred IUPAC name: 2-Benzofuran-1,3-dione

Other names

Isobenzofuran-1,3-dione
Phthalic anhydride

Identifiers

CAS Number: 85-44-9

JSmol: Interactive image

ChEBI: CHEBI:36605

ChEMBL: ChEMBL1371297

ChemSpider: 6552

ECHA InfoCard: 100.001.461

RTECS number: TI3150000

Properties

Chemical formula: CHO843

Molar mass: 148.1 g/mol

Appearance: white flakes

Odor: characteristic, acrid

Density: 1.53 g/cm, solid; 1.20 g/mL, molten3

Melting point: 131.6 °C (268.9 °F; 404.8 K)

Boiling point: 295 °C (563 °F; 568 K) sublimates

Solubility in water: 0.62 g/100g (20—25 °C);
19.0 g/100g (100 °C);
reacts slowly

Vapor pressure: 0.0015 mmHg (20°C)

Magnetic susceptibility: -67.31·10 cm/mol−63

Hazards

R-phrases: R22 R37/38 R41 R42/43

S-phrases: (S2) S23 S24/25 S26 S37/39 S46

NFPA 704:

Flash point: 152 °C (306 °F; 425 K)

Explosive limits: 1.7%-10.5%

median dose: 4020 mg/kg (oral, rat)
1520 mg/kg (oral, mouse)
800 mg/kg (oral, cat)
800-1600 mg/kg (oral, rat)
2210 mg/kg (oral, mouse)

NIOSH

PEL: TWA 12 mg/m (2 ppm)3

REL: TWA 6 mg/m (1 ppm)3

IDLH: 60 mg/m3

Related compounds

Related compounds: Phthalic acid

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).

Infobox references