phthalic anhydride supplier

Oxidation of Ortho-Xylene:
Ortho-xylene is vaporized and mixed with air in the presence of a catalyst (usually vanadium pentoxide).
The reaction occurs at high temperatures (350-400°C), producing phthalic anhydride as the main product.
Oxidation of Naphthalene:
Naphthalene is similarly oxidized in the presence of a catalyst to produce phthalic anhydride.
Both methods yield high-purity phthalic anhydride, which is then purified and solidified for industrial use.
Key Applications
Phthalic anhydride is a cornerstone in many industries due to its reactivity and versatility. Some of its major applications include:
Alkyd Resins for Paints and Coatings:
It is used to produce alkyd resins, which are essential for durable and glossy paints, varnishes, and coatings.
Plasticizers for PVC:
Phthalic anhydride is a key raw material for phthalate-based plasticizers like DOP (Dioctyl Phthalate), which makes PVC flexible and durable.
Unsaturated Polyester Resins (UPR):
It is used to produce UPR, which is widely used in fiberglass, composites, and construction materials.
Dyes and Pigments:
It serves as an intermediate in the synthesis of dyes and colorants.
Pharmaceuticals:
It produces certain drugs and active pharmaceutical ingredients (APIs).
Why Phthalic Anhydride Matters
Phthalic anhydride’s unique properties and wide range of applications make it an indispensable chemical in modern industries. Its cost-effectiveness and reactivity ensure its continued demand in the construction, automotive, and manufacturing sectors.

What is Phthalic Anhydride? Properties, Applications, and Production Methods
Phthalic anhydride is a vital industrial chemical with many applications in various industries, including plastics, coatings, and resins. This white crystalline solid, with the chemical formula C₈H₄O₃, is known for its versatility and cost-effectiveness. This article will explore its properties, production methods, and key applications.

Chemical Structure and Properties
Phthalic anhydride is an organic compound with a distinctive structure consisting of a benzene ring fused to an anhydride functional group. It appears as white crystalline flakes or powder and has a sharp odor. Some of its key properties include:

Melting Point: 131°C (268°F)
Boiling Point: 295°C (563°F)
Solubility: Soluble in hot water and organic solvents like alcohol and acetone.
These properties make it highly reactive and suitable for various chemical processes.
Production Methods
Phthalic anhydride is primarily produced through the oxidation of ortho-xylene or naphthalene. The process involves:

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Phthalic anhydride is primarily produced through the catalytic oxidation of ortho-xylene or naphthalene. In this process, ortho-xylene is vaporized and mixed with air in the presence of a vanadium pentoxide catalyst at high temperatures (350-400°C). The reaction yields phthalic anhydride, which is then cooled and solidified. The final product is purified to remove impurities, ensuring high quality. This efficient and widely used method makes phthalic anhydride a key industrial chemical for various applications.

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