Clean the plastic mold with Zclean
How to support phase polymer flocculation and sludge extractor

Type | Buy | Sale |

Online Users : 2691
Today's Visitor : 43
Total Hit Counter : 121449
Phthalic anhydride
Product details:
- Product Name: Phthalic anhydride
- Formulas : C 8 H 4 O 3
- Chemical composition : Taiwan-technical grade -25kg
- Product Type: Industry chemicals
Product description :
Phthalic anhydride is the organic compound with the formula C6H4(CO)2O. It is the anhydride of phthalic acid. This 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.[1]
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.[2] 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.
Preparation of phthalate esters
As with other anhydrides, the alcoholysis reaction is the basis of the manufacture of phthalate esters, which are widely used (and controversial - see endocrine disruptor) plasticizers.[1] In the 1980s, approximately 6.5×109 kg of these esters were produced annually, and the scale of production was increasing each year, all from phthalic anhydride. The process begins with the reaction of phthalic anhydride with alcohols, giving the monoesters:
- C6H4(CO)2O + ROH → C6H4(CO2H)CO2R
The second esterification is more difficult and requires removal of water:
- C6H4(CO2H)CO2R + ROH
C6H4(CO2R)2 + H2O
The most important diester is bis(2-ethylhexyl) phthalate ("DEHP"), used in the manufacture of polyvinyl chloride.
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.[3] A related ring-opening reaction involves peroxides to give the useful peroxy acid:[4]
- 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.[5]
Vichemfloc 70010-Nonionic flocculant |
Vichemfloc 62424-Anion flocculant |
Sodium chloride |
Caustic soda pearl 99% |
Gibberellic acid |
Caustic soda flakes 99% |
Epoxy E44 & Hardener T31 |
Vichemfloc 62414 |
Na2EDTA |
Calcium hypochlorite - 70% |
Trichloroisocyanuric acid |
EO Cleaner - Heavy-duty degreasing detergent |
Sodium citrate |
Sodium hexamethaphosphate |
Sodium Benzoate |
Antracite |
Mercury - Hg - Japan - 1.5kg |
Hydrofluoric acid |
Benzyl alcohol |
Sodium sulphide nonahydrate |
Nitric acid - HNO3 - Korea - 68% - 35kg |
Sodium Nitrite |
Sodium dichloroisocyanurate |
Potassium Sodium Tartrate |
Sodium Nitrate |