Description
English name: o-Phthalic anhydride
Abbreviation: PA
Another name: 2,5-Isobenzofurandione
Phthalic anhydride 99+ %
2-benzofuran-1,3-dione
2,2''''-(oxydicarbonyl)dibenzoic acid
Chemical formula:C8H4O3,C6H4(CO)2O
Molecular formula: C23H29CLO6
Molecular weight: 148.12
CAS: 84-44-9
O-Phthalic anhydride is formed by phthalic acid molecular through dehydration. O-phthalic anhydride is made fromnaphthalenemixed with air through the process of 350~360C vapor phase oxidation catalyzed by vanadium pentoxide,.Phthalic anhydride is in the shape of white scalycrystalline powder. It is an important organic chemical materialmainly used in the production of plasticizer, alkyd resin, dye, unsaturated resinsome ofmedicines or pesticides.
Technical index
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Density
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1.53
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Melting chroma
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100
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Thermal stability chroma
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150
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Melting point
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131.2C
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Boiling point
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295C
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Crystallization point
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C 130.0
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Purity%
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99.5
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Free acid content
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% 0.5
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Stability
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Stable
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Water-solubility
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Soluble in hot water, ethanol, ethyl ether, benzenemost organic solvents except cold water.
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