Phthalic Anhydride

Ürün Açıklaması

Phthalic Anhydride — Brief Technical Overview Phthalic anhydride is a white, crystalline industrial chemical widely used as a key intermediate in the production of plasticizers, resins, and dyes. It is the anhydride form of phthalic acid and appears as flakes or needles with a characteristic, slightly acrid odor. Chemical Identity Formula: C₈H₄O₃ Appearance: White flakes or crystalline needles Odor: Mild, pungent, or acrid depending on purity Melting Point: ~131–134 °C Boiling Point: ~284–295 °C (sublimes) Production Phthalic anhydride is typically produced by catalytic oxidation of ortho‑xylene or naphthalene, processes widely used in large‑scale industrial plants. Key Applications Phthalic anhydride is one of the most important building‑block chemicals in polymer and coating industries. Major uses include: Plasticizers: Production of phthalate esters used to soften PVC and other plastics Unsaturated Polyester Resins (UPR): A core raw material for fiberglass composites, coatings, and construction materials Alkyd Resins: Essential for paints, varnishes, and protective coatings Dyes & Pigments: Intermediate for phthaleins, synthetic indigo, and other colorants Other Derivatives: Benzoic acid, chlorinated products, synthetic fibers, and pharmaceuticals Why Industries Use It Phthalic anhydride is valued for: High reactivity toward alcohols and glycols Ability to produce durable, flexible, and chemically resistant polymers Compatibility with large‑scale continuous production syst