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Phthalic Anhydride(PA)

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Place of Origin:
Tianjin China (Mainland)
Manufacture of polyester resins, a...
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Tianjin Okeyou International Trade Co., Ltd.
China (Mainland) China (Mainland)
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Item specifics

  • Place of Origin: Tianjin China (Mainland)
  • MF: C8H4O3
  • Application: Manufacture of polyester resins, a...
  • Port: xingang
  • Purity: 99.5%
  • Other Names: Phthalic Anhydride
  • Grade Standard: Agriculture Grade, Food Grade, ...
  • Model Number: PA
  • Appearance: white flakes
  • Payment Terms: T/T,Western Union
  • Minimum Order Quantity: 18 Metric Ton/Metric Tons 1*20fcl
  • package: 25kg/bag(woven)
  • Supply Ability: 500 Metric Ton/Metric Tons per Month 20*20fcl
  • Brand Name: OKEYOU
  • CAS No.: 85-44-9


1:PA:White flaky crystal, stimulate a strong odor;
2:Usage:Unsaturated resin, water treatment agent paint
3:Purity:99.5% flake

Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. This anhydride of phthalic acid, a colourless solid, is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. In 2002, approximately 4.6 billion kilograms were produced

Applications in industry and organic synthesis

Phthalic anhydride is a versatile intermediate in organic chemistry, in part because it is bifunctional and cheaply available. It undergoes hydrolysis and alcoholysis. Hydrolysis by hot water forms ortho-phthalic acid. This process is reversible: Phthalic anhydride re-forms upon heating the acid above 180 °C.

Hydrolysis of anhydrides is not typically a reversible process. However, phthalic acid is easily dehydrated to form phthalic anhydride due to the creation of a thermodynamically favorable 5-membered ring.

Organic synthesis

Phthalic anhydride is a precursor to a variety of reagents useful in organic synthesis. Important derivatives include phthalimide and its many derivatives. Chiral alcohols form half-esters (see above), and these derivatives are often resolvable because they form diastereomeric salts with chiral amines such as brucine. A related ring-opening reaction involves peroxides to give the useful peroxy acid:

C6H4(CO)2O + H2O2 → C6H4(CO3H)CO2H

Precursor to dyestuffs

Phthalic anhydride is widely used in industry for the production of certain dyes. A well-known application of this reactivity is the preparation of the anthroquinone dye quinizarin by reaction with para-chlorophenol followed by hydrolysis of the chloride.


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