Overview
Propionyl chloride is an organic compound belonging to the acyl chloride family, characterized by its high reactivity due to the presence of a carbonyl chloride functional group. Industrially produced through the reaction of propionic acid with thionyl chloride or phosphorus trichloride, it serves as a vital intermediate in organic synthesis. The compound is primarily utilized in the pharmaceutical sector for manufacturing active pharmaceutical ingredients (APIs) like non-steroidal anti-inflammatory drugs (NSAIDs). Its ability to introduce the propionyl group (–COCH2CH3) makes it indispensable in fine chemical production.
Physical and Chemical Properties
Propionyl chloride is a volatile liquid with a sharp, irritating odor reminiscent of hydrochloric acid. It hydrolyzes violently upon contact with water or humidity, releasing hydrogen chloride gas—a reaction requiring strict moisture control during handling. The compound’s boiling point of 80°C necessitates storage below 30°C to prevent pressure buildup. Chemically, it undergoes typical acyl chloride reactions including nucleophilic substitution with alcohols (esterification) and amines (amide formation). Its IR spectrum shows a strong C=O stretch at ~1800 cm−1, while 1H NMR displays a triplet (CH3) at ~1.2 ppm and a quartet (CH2) near 3.0 ppm.
Main Applications
In pharmaceuticals, propionyl chloride is used to synthesize ibuprofen and ketoprofen derivatives. It also serves as a precursor for propionate esters in flavor/fragrance industries (e.g., ethyl propionate for fruity notes). Agrochemically, it modifies pesticide structures to enhance bioavailability. The compound acts as a catalyst in polymerization processes for polypropylene production. Specialty applications include photographic chemicals and dye intermediates, where its reactivity enables precise molecular modifications without side reactions.
Safety and Storage
Classified as a Class 8 corrosive substance (UN1815), propionyl chloride requires DOT-approved corrosion-resistant containers (e.g., stainless steel or glass-lined drums). Storage areas must have acid-resistant ventilation and spill containment measures. Personnel need PPE: neoprene gloves, face shields, and acid gas respirators. In case of spills, neutralize with dry sodium bicarbonate or lime—never water. First aid involves immediate flushing of affected skin/eyes with water for 15 minutes. Firefighting requires CO2 or dry chemical extinguishers; water exacerbates HCl emission.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch-specific CoA (Certificate of Analysis) verifying purity (≥98%) and low water content (<0.5%). Bulk shipments (200kg drums) typically offer 10-15% cost savings over small packages (25kg). Logistics must ensure temperature-controlled transport (<25°C) with desiccant packs. Contracts should specify incoterms (e.g., DDP for hazardous goods) and liability clauses for hydrolysis-induced container corrosion. Alternative suppliers in China (Jiangsu) and Germany dominate global production.
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