Overview
Propyl formate is an organic ester formed from formic acid and n-propanol. It is classified as a short-chain aliphatic ester, sharing characteristics with similar compounds like ethyl formate and butyl formate. Industrially, it is synthesized via esterification reactions catalyzed by acids. The compound is valued for its solvent properties and pleasant fruity aroma, which resembles rum or raspberries. This dual functionality makes it useful in both industrial and consumer applications, though it is produced in smaller volumes compared to more common esters.
Physical and Chemical Properties
As a low-molecular-weight ester, propyl formate exhibits high volatility with a boiling point of 81°C. Its density (0.897 g/cm³) is lower than water, and it forms azeotropes with several solvents. The compound's vapor pressure is approximately 78 mmHg at 20°C, indicating moderate evaporation potential. The ester undergoes typical reactions including hydrolysis (especially under acidic or alkaline conditions) and transesterification. It is relatively stable at room temperature but should be protected from strong oxidizers. Its flash point is -3°C, classifying it as a highly flammable liquid.
Main Applications
In industrial settings, propyl formate serves as a solvent for cellulose derivatives, resins, and oils. Its balanced solvency and volatility make it suitable for coatings and ink formulations where faster drying is required. The chemical also acts as a process solvent in pharmaceutical manufacturing. Within the food industry, it is approved as a flavoring agent (FEMA GRAS 2943) for imparting fruity notes to candies, baked goods, and beverages. The fragrance industry utilizes it in perfumery for top notes and as a synthetic fruit essence component.
Safety and Storage
Propyl formate requires careful handling due to its flammability and mild irritant properties. Storage containers should be grounded to prevent static discharge, and quantities exceeding 1L should be kept in approved flammable liquid cabinets. NFPA ratings are Health: 2, Flammability: 3, Reactivity: 0. Personnel should use chemical goggles, gloves (nitrile recommended), and respiratory protection when handling in enclosed spaces. Spills should be contained with absorbent materials like vermiculite—never use water spray. Shelf life is typically 2 years when stored in tightly sealed stainless steel or lined containers.
B2B Procurement Guide
Industrial buyers should specify technical grade (≥98% purity) for solvent applications or food grade (FCC compliant) for flavor uses. Common packaging includes 200kg steel drums, IBC totes (1000L), or bulk tanker shipments for large consumers. Lead times vary from 2-6 weeks depending on regional availability. Key quality indicators include acid value (<0.1%), water content (<0.1%), and absence of propanol residues. Asian manufacturers dominate production, with major suppliers in China and India. Consider requesting samples to verify odor profile consistency, especially for fragrance applications.
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