Product Overview

Phthalic acid is an aromatic dicarboxylic acid, with formula C₆H₄(CO₂H)₂. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale.

Characteristic Data

Property Value
Formula C8H6O4
Melting Point 207 °C (405 °F; 480 K)
Molar Mass 166.14 g/mol
Density 1.59 g/cm³
Solubility in Water 0.6 g / 100 mL
Acidity (pKa) 2.89, 5.51
Vapor density 5.1 (vs air)
Vapor pressure <0.01 mm Hg ( 20 °C)
Flash point 152 °C
Storage temp Store below +30°C
Solubility 6g/l (slow decomposition)
Form Flaky Crystals
Color Clear colorless to slightly yellow
PH 2 (6g/l, H2O, 20℃)
Odor Characteristic choking odor
Water Solubility 6 g/L (20 ºC)
Sensitive 207 °C (405 °F; 480 K)
Stability Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, moisture, strong acids. Dust may form an explosive mixture with air


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Phthalic acid is an aromatic dicarboxylic acid with the chemical formula C₆H₄(CO₂H)₂. It belongs to the class of aromatic compounds and features two carboxylic acid functional groups.

While phthalic acid itself has modest commercial significance, its derivative phthalic anhydride is produced on a large scale and is considered a commodity chemical. Phthalic anhydride is a key industrial compound derived from phthalic acid.

Phthalic acid finds application as a precursor in the synthesis of various chemicals, including the production of phthalic anhydride. It serves as an intermediate in the synthesis of polymers, resins, and other specialty chemicals.

Phthalic anhydride is a crucial compound derived from phthalic acid, and it is produced on a large scale due to its significance in the manufacturing of plasticizers, dyes, resins, and other widely used industrial products.

Phthalic acid’s dicarboxylic acid structure makes it valuable for the synthesis of polymers and resins. Its aromatic nature and reactivity contribute to its versatility in the production of a range of chemical compounds.

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