Phthalic Anhydride (PA), chemical formula C8H4O3 and CAS number 85-44-9, is a fundamental organic compound that underpins a vast array of industrial applications. As a white, crystalline solid, it possesses distinct chemical properties that make it an exceptionally versatile intermediate in chemical synthesis. Understanding these properties and the production methods is crucial for anyone in the chemical procurement or R&D sectors looking to utilize this compound effectively.

Chemically, Phthalic Anhydride is the anhydride of phthalic acid. It features a bifunctional structure, characterized by an anhydride functional group. This reactivity allows it to undergo various reactions, including hydrolysis, alcoholysis, and ammonolysis, forming derivatives like phthalic acid, esters, and imides. Its melting point typically falls between 131-134°C, and it has a boiling point of approximately 284°C. While slightly soluble in hot water, it exhibits better solubility in organic solvents such as alcohol, ether, and carbon disulfide. These properties dictate its handling and processing parameters in industrial settings.

The industrial production of Phthalic Anhydride is predominantly achieved through the catalytic vapor-phase oxidation of either ortho-xylene or naphthalene. This highly optimized process typically employs vanadium pentoxide (V2O5) as the catalyst, with air serving as the oxidant. The reaction is carried out at elevated temperatures, transforming the hydrocarbon feedstock into Phthalic Anhydride. This method is favored for its efficiency and scalability, meeting the global demand for this compound. For buyers, knowing the production route helps in understanding potential impurity profiles and consistency.

The principal use of Phthalic Anhydride lies in its conversion to phthalate esters, which function as plasticizers. These are indispensable additives for polymers like PVC, enhancing their flexibility and workability. Consequently, industries manufacturing plastics for construction, automotive, electronics, and consumer goods rely heavily on a stable supply of PA. Procurement managers often seek to buy Phthalic Anhydride from established manufacturers to ensure consistent quality and competitive Phthalic Anhydride prices.

Beyond plasticizers, Phthalic Anhydride is a key reactant in synthesizing numerous other compounds. It is integral to the production of alkyd resins, widely used in paints, varnishes, and coatings, where it imparts durability and gloss. It also serves as an intermediate for dyes and pigments, contributing color to textiles, inks, and plastics. Furthermore, its applications extend to pharmaceuticals, agricultural chemicals, and as a curing agent for epoxy resins.

Given its industrial importance, securing Phthalic Anhydride (CAS 85-44-9) from a reliable Phthalic Anhydride supplier is paramount. Buyers should look for suppliers who can provide detailed specifications, robust quality control, and efficient logistics. Companies like NINGBO INNO PHARMCHEM CO.,LTD. are dedicated to providing high-purity Phthalic Anhydride, supporting diverse industrial needs with consistent product quality and dependable supply chains.