In the vast landscape of industrial chemicals, certain compounds serve as foundational elements for numerous advanced materials and processes. Terephthaloyl Chloride (CAS 100-20-9) is one such indispensable chemical. As an acyl chloride derived from terephthalic acid, it possesses a unique reactivity that makes it highly valuable across diverse sectors, including the manufacturing of high-performance polymers, specialty fibers, and even certain agrochemicals.

Physically, Terephthaloyl Chloride typically appears as white to off-white crystals. Its molecular formula is C8H4Cl2O2, with a molecular weight of approximately 203.02 g/mol. The compound exhibits a melting point in the range of 79-81 °C and a boiling point around 266 °C. Crucially, it is known to be rapidly hydrolyzed by moisture in the air, forming the corresponding terephthalic acid. This characteristic necessitates careful handling and storage under dry conditions. Its high purity, often exceeding 99.5%, is a critical factor for its effective use in synthesis.

The synthesis of Terephthaloyl Chloride is primarily achieved through the chlorination of terephthalic acid or its derivatives. Common methods include reacting terephthalic acid with chlorinating agents such as thionyl chloride or phosgene, or through ester chlorination processes. Understanding these synthesis routes is vital for manufacturers to ensure product quality and consistency. For purchasing managers, knowing the production methods can also inform their choice of supplier and help assess potential variations in product characteristics.

The applications of Terephthaloyl Chloride are broad and impactful. Its most prominent use is as a monomer in the synthesis of high-strength, high-modulus polymers and fibers, notably polyparaphenylene terephthalamide (aramid). These materials are celebrated for their exceptional tensile strength, thermal stability, and flame resistance, finding critical applications in protective clothing, aerospace, and automotive components. Additionally, it serves as a reinforcing agent for nylon and is used in the production of certain pesticides. When considering a purchase, exploring the availability and price from reputable chemical manufacturers is a prudent step.

In summary, Terephthaloyl Chloride is a cornerstone chemical intermediate whose unique properties and reactivity drive innovation in multiple industries. Whether you are involved in polymer science, fiber manufacturing, or agrochemical development, understanding its characteristics and applications is key. For those looking to buy Terephthaloyl Chloride, partnering with a reliable manufacturer ensures access to high-purity material and consistent supply, supporting your most demanding projects.