Phthalic anhydride

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Phthalic Anhydride


Phthalic anhydride, commonly referred to as phthalic anhydride, is a white flaky or crystalline powder with the molecular formula C₈H₄O₃ and a molecular weight of 148.12. Its melting point is 131.1 °C, boiling point is 284.5 °C, flash point is 151 °C (closed cup) and 165 °C (open cup), autoignition temperature is 584 °C, and density is 1.527 g/cm³. It is poorly soluble in cold water but readily soluble in hot water, ethanol, diethyl ether, benzene, and most other organic solvents.

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