Phthalic Anhydride (PA), chemically known as isobenzofuran-1,3-dione, is a critical organic compound with a molecular formula of C8H4O3. Its distinct white crystalline appearance and pungent odor are characteristic of this versatile industrial chemical. Understanding its chemical properties and manufacturing processes is key for anyone involved in its procurement or application. As a dedicated manufacturer and supplier, we pride ourselves on providing insight into the backbone of many industrial syntheses.

The chemical structure of Phthalic Anhydride features an aromatic benzene ring fused with a five-membered anhydride ring. This anhydride functional group is highly reactive, readily undergoing hydrolysis with water to form phthalic acid. It also reacts with alcohols (alcoholysis) to form monoesters and diesters, and with amines (ammonolysis) to form phthalamides and phthalimides. These reactions are the foundation for its extensive use. For instance, its reaction with alcohols to form phthalate esters is the primary route for producing plasticizers, a major market for PA. When you buy Phthalic Anhydride, you are acquiring a chemical with inherent reactivity essential for numerous syntheses.

The industrial production of Phthalic Anhydride predominantly occurs through the vapor-phase catalytic oxidation of ortho-xylene. This process typically employs vanadium pentoxide (V2O5) as a catalyst, operating at elevated temperatures. Air serves as the oxidant, transforming ortho-xylene into phthalic anhydride with high efficiency. An alternative, though less common method, involves the oxidation of naphthalene. The careful control of reaction conditions, catalyst selection, and purification processes are critical to achieving the high purity required for most applications. We ensure our manufacturing processes yield PA that meets stringent industrial standards, making us a reliable source when you need to purchase this vital chemical.

The properties of Phthalic Anhydride, such as its melting point of approximately 131°C and its solubility in various organic solvents, also dictate its handling and application. While insoluble in cold water, it is slightly soluble in hot water. Its ability to be processed both as a solid (flakes) and in molten form offers flexibility to industrial users. Understanding these physical and chemical characteristics helps optimize its use in complex manufacturing workflows. For buyers, knowing these details from a reputable supplier ensures the material is suitable for their specific process.

As a leading chemical supplier, we are committed to providing high-quality Phthalic Anhydride along with comprehensive technical information. We invite manufacturers and formulators to inquire about our Phthalic Anhydride for sale and learn more about its chemical versatility and our manufacturing capabilities.