Phthalic anhydride
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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 white 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.[4]
Quick Facts Names, Identifiers ...
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Names | |||
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Preferred IUPAC name
2-Benzofuran-1,3-dione[1] | |||
Other names | |||
Identifiers | |||
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3D model (JSmol) |
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118515 | |||
ChEBI | |||
ChEMBL | |||
ChemSpider |
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ECHA InfoCard | 100.001.461 | ||
EC Number |
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27200 | |||
PubChem CID |
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RTECS number |
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UNII | |||
UN number | 2214 | ||
CompTox Dashboard (EPA) |
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Properties | |||
C8H4O3 | |||
Molar mass | 148.1 g/mol | ||
Appearance | white flakes | ||
Odor | characteristic, acrid[2] | ||
Density | 1.53 g/cm3, solid; 1.20 g/mL, molten[2] | ||
Melting point | 131.6 °C (268.9 °F; 404.8 K) | ||
Boiling point | 295 °C (563 °F; 568 K) sublimates | ||
0.62 g/100g (20—25 °C); 19.0 g/100g (100 °C); reacts slowly | |||
Vapor pressure | 0.0015 mmHg (20 °C)[2] | ||
−67.31×10−6 cm3/mol | |||
Hazards | |||
GHS labelling: | |||
Danger | |||
H302, H315, H317, H318, H334, H335 | |||
P261, P264, P270, P271, P272, P280, P285, P301+P312, P302+P352, P304+P340, P304+P341, P305+P351+P338, P310, P312, P321, P330, P332+P313, P333+P313, P342+P311, P362, P363, P403+P233, P405, P501 | |||
NFPA 704 (fire diamond) | |||
Flash point | 152 °C (306 °F; 425 K) | ||
Explosive limits | 1.7%–10.5% | ||
Lethal dose or concentration (LD, LC): | |||
LD50 (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)[3] | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible) |
TWA 12 mg/m3 (2 ppm)[2] | ||
REL (Recommended) |
TWA 6 mg/m3 (1 ppm)[2] | ||
IDLH (Immediate danger) |
60 mg/m3[2] | ||
Related compounds | |||
Related compounds |
Phthalic acid Phthalimide Phthalide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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