2,4,6-Trichloro-1,3,5-triazine
Overview
2,4,6-Trichloro-1,3,5-triazine (cyanuric chloride) is a versatile chemical intermediate with a triazine backbone and three reactive chlorine atoms. It is a cornerstone in organic synthesis, particularly for manufacturing agrochemicals and dyes. Its high reactivity stems from the chlorine atoms, which can be substituted with nucleophiles like amines or alcohols. First synthesized in the 19th century, cyanuric chloride gained industrial prominence in the mid-20th century due to its role in producing s-triazine herbicides (e.g., atrazine) and optical brighteners. Today, it is produced globally, with major manufacturers in China, India, and Europe.
Physical and Chemical Properties
Cyanuric chloride appears as white crystals with a pungent odor. It sublimes at 190°C and is denser than water (1.92 g/cm³). The compound is stable under dry conditions but hydrolyzes rapidly in water, releasing hydrochloric acid. This exothermic reaction necessitates careful moisture control during storage. Its reactivity is selective: the first chlorine substitutes at 0–5°C, the second at 30–50°C, and the third above 70°C. This gradient enables stepwise synthesis of derivatives. Solubility is high in non-polar solvents (e.g., toluene) but negligible in water due to hydrolysis.
Main Applications
Herbicides account for ~60% of global cyanuric chloride demand. It is a key precursor for s-triazine herbicides (e.g., simazine), which inhibit photosynthesis in weeds. The dye industry uses it to manufacture reactive dyes and fluorescent brighteners for textiles and paper. In pharmaceuticals, it serves as a building block for antiviral drugs and cross-linking agent for drug-delivery polymers. Lesser applications include flame retardants, rubber vulcanization agents, and resins for coatings. Emerging uses in electronic materials are under research.
Safety and Storage
Cyanuric chloride is classified as corrosive (Skin Corr. 1B) and toxic (Acute Tox. 4). Inhalation of dust or vapors causes respiratory irritation, while skin contact leads to severe burns. Always use nitrile gloves, goggles, and respirators in well-ventilated areas. Store in original sealed containers under nitrogen or dry air, away from water, alcohols, and amines. Ideal storage temperature is below 25°C. Spills should be neutralized with sodium bicarbonate and collected inert absorbents. Dispose as hazardous waste per local regulations.
B2B Procurement Guide
When sourcing cyanuric chloride, prioritize suppliers with ISO 9001 certification and batch-specific Certificates of Analysis (COA). Verify purity (≥98% by HPLC) and chlorine content (theoretical: 57.7%). Technical grade (95%) suffices for herbicide production but not pharmaceuticals. Packaging options include 25 kg PE-lined fiber drums or 500 kg super sacks for bulk orders. Demand FOB/CIF quotes and confirm lead times (typically 2–4 weeks). Audit suppliers for proper handling facilities to avoid moisture contamination. Spot prices fluctuate with chlorine market trends.
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