Overview
Terephthalaldehyde (TPA) is an aromatic dialdehyde with the formula C8H6O2, primarily used as a chemical intermediate in industrial applications. It is structurally derived from terephthalic acid and is notable for its high reactivity due to the presence of two aldehyde groups. TPA is synthesized through the oxidation of p-xylene or other precursors. Its versatility makes it valuable in polymer production, dye manufacturing, and pharmaceutical synthesis. The compound is typically supplied as a crystalline powder with a mild odor.
Physical and Chemical Properties
Terephthalaldehyde appears as a white to pale yellow crystalline solid with a melting point of 114-116°C and a boiling point of 248-250°C. It has a density of 1.18 g/cm³ and is soluble in common organic solvents like ethanol and acetone, though it has limited solubility in water. The compound's key chemical feature is its two reactive aldehyde groups, which participate in condensation and polymerization reactions. TPA is stable under normal conditions but may decompose when exposed to strong oxidizers or high temperatures, releasing carbon monoxide and other byproducts.
Main Applications
TPA serves as a critical intermediate in the production of high-performance polymers, including polyimides and liquid crystal polymers (LCPs). These materials are used in electronics, aerospace, and automotive industries due to their thermal stability and mechanical strength. In the dye industry, TPA is a precursor for fluorescent brighteners and pigments. It also finds use in pharmaceuticals, where it acts as a building block for active ingredients. Additionally, TPA is employed as a crosslinking agent in resins and adhesives, enhancing their durability.
Safety and Storage
Terephthalaldehyde is classified as an irritant, posing risks to skin, eyes, and respiratory systems upon exposure. Proper personal protective equipment (PPE), including gloves and goggles, is essential during handling. Adequate ventilation is required to minimize inhalation risks. Storage should be in a cool, dry environment, away from oxidizing agents and direct sunlight. Containers must be tightly sealed to prevent moisture absorption. Spills should be contained using inert absorbents and disposed of according to local regulations.
B2B Procurement Guide
When sourcing TPA, prioritize suppliers with certifications such as ISO 9001 or GMP compliance to ensure quality. Key specifications to verify include purity (typically ≥98%), CAS number (623-27-8), and absence of heavy metal contaminants. Prices vary based on purity and order volume, averaging $50-$100/kg. Bulk purchases may qualify for discounts. Request safety data sheets (SDS) and certificates of analysis (CoA) before procurement. For international shipping, confirm compliance with transportation regulations for hazardous materials.
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