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Maleic Anhydride

Maleic Anhydride (Maleic Anhydride) is an intermediate chemical, produced from oxidation of benzene using a special catalyst.

Maleic Anhydride is a versatile chemical that is needed in almost all fields of the chemical industry. The use of Maleic Anhydride varies due to the structure of the di carboxylic acid group, double bond reactivity between alpha and beta positions. This chemical structure and the high reactivity of the Maleic Anhydride derivative make it possible to make various types of resins and also organic reagents for various chemical transformations.


Maleic Anhydride is an important Organic Acid Anhydride. It is used in the manufacture of wide range of products like Un-saturated Polyester Resins, Alkyd Resins, Lube Oil Additives, Paper Sizing Chemicals, Insecticides and Fine Chemicals.


  • Chemical formula: C4H2O3
  • Molecular Weight: 98.06
  • CAS-number: 108-31-6

1. Specification

Item Unit Value Test Method
Appearance - White Briquet or Pastil Type Visual
Molten Color (APHA) 20 Max. JIS K 1359
Purity (Total Acid) wt% 99.5 Min. JIS K 1359
Solidification Point 52.5 Min. JIS K 1359
Ash wt% 0.001 Max. JIS K 1359
Iron ppm 1 Max. Absorption Spectrophotometry

2. Packing

  • Briquet Type
    Net 25kg/500kg/600kg Bag
  • Pastil Type
    Net 25kg/500Kg Bag
  • Molten Type
    20MT Tank Trailer

3. Physical Property (for Reference)

Item Unit Value
Boiling Point 202
Specific Gravity(at 70/70℃) - 1.3
Heat of formation kJ/mol -470.41
Heat of combustion kJ/mol -1.390
Heat capacity kJ/(kg.K) 1.21 (Solid)
1.67 (Liquid)
Heat of vaporization kJ/mol 54.8
Heat of hydrolysis kJ/mol -34.9
Heat of neutralization kJ/mol 126.9
Flash Point 110 (Open Cup)
102 (Closed Cup)
Solubility in solvent Acetone (at 25℃) g/100g 227
Benzene (at 25℃) g/100g 50
o-xylene (at 25℃) g/100g 19.4
Vapor Pressure at 44.0℃ kPa 0.13
at 63.4℃ kPa 0.67
at 95.0℃ kPa 2.7
at 135.8℃ kPa 13.3
at 179.5℃ kPa 53.3
at 202.0℃ kPa 100
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