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phthalic anhydride
phthalic anhydride
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[China Supplier]
Contact Person : Mr. Liu Haiping
Tel : 86-351-8390369
Fax : 86-351-8390339
Product Detail
phthalic anhydride 1.Good quanlity and 2.the manufacture of plasticizers, alkydresins 3.Phthalic Anhydride 4. SGS ,BV TE

phthalic anhydride

1 Phthalic anhydride is the organic compound with the formula C8H4O3. 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

2 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.

3 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

4 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

5 Precursor to dyestuffs

6 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.

ItemIndex
Top gradeFirst gradeQualified product
Appearancewhite scaly or crystalline powderwhite scaly or crystalline powder with slight colors
molten Chroma(Chroma no. )≤2050100
thermostable Chroma(Chroma no. )≤50150-
Chroma of vitriol(Chroma no. )≤60100150
crystallization point°C≥130.5130.3130.0
Purity(mass fraction)%≥99.5099.5099.00
Free acid(mass fraction)≤ %0.200.300.50
Ash(mass fraction)%≤0.05--

phthalic anhydride

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