Maleic Anhydride (C4H2O3)

What is Maleic Anhydride?

Maleic anhydride is an organic compound with the chemical formula C4H2O3, found in the form of white granules or pellets. This substance, which is a diene anhydride with two carboxylic acid groups, is used in industry as a precursor for numerous chemical reactions and products.

• They play a role in the production of polymers, resins, plastics, adhesives, paints, varnishes, and pharmaceutical products.
• It is also preferred as a reagent in organic synthesis.
• Thanks to its thermal resistance, adhesive-enhancing, and drying properties, it holds an important place in industrial production.

Maleic Anhydride Properties

In Which Industries Is Maleic Anhydride Used?

Polymer Industry

• It is used in the production of styrene-maleic anhydride copolymer by combining with styrene.
• It provides raw materials for thermoplastics, coating materials, and adhesives.

Resin Production

• It is used in the production of epoxy, acrylic, and polyester resins.
• It acts as an additive that increases durability and flexibility.

Paint and Varnish Industry

• Provides the drying properties of paints.
• Increases the adhesion and durability of varnishes.

Plastics Industry

• Improves the mechanical and thermal properties of plastics.
• It increases hardness and durability as an additive.

Pharmaceutical Industry

• It is used as an intermediate in the production of certain drugs.
• Enhances the stability of active ingredients.

Other Applications

• Adhesives, cellulose esters, emulsion stabilizers, and certain food additives.

How is Maleic Anhydride Produced?

Maleic anhydride is typically produced through the oxidation of n-butene. The production process consists of the following steps:

1. Preparation
   • n-Butene, oxygen, and nitrogen gases are fed into the reactor.
2. Use of Catalysts
   • The reaction yield is increased by adding molybdenum or vanadium-based catalysts.
3. Heating
   • The reactor is heated to a temperature range of 300–400 °C.
4. Reaction
   • n-Butene reacts with oxygen to form maleic anhydride.
5. Separation and Cooling
   • The resulting gas mixture is cooled and maleic anhydride is separated.
6. Purification and Packaging
   • The product is purified and packaged for industrial use.