Propionic Acid (79-09-4) About
Propionic acid (CAS number
79-09-4), officially known by its IUPAC name
propanoic acid, is a naturally occurring, short-chain
carboxylic acid with the chemical formula
CHCHCOOH. It presents as a clear, colorless liquid that carries a highly pungent, unpleasant odor resembling body odor or sour cheese. [
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Versatile Food and Industrial UsesPropionic acid is prized for its preservative properties, effectively inhibiting mold growth in animal feed and bakery products. Its widespread use in the food industry is complemented by its utility as a building block in the synthesis of plastics, pharmaceuticals, flavors, and fragrances. With adherence to international quality standards (ISO, FCC, BP), this organic intermediate is relied upon for both safety and effectiveness.
Exceptional Solubility and StabilityThis sour-tasting liquid demonstrates outstanding solubility, being miscible with water, alcohol, ether, and chloroform. Propionic acid maintains stability when stored in dry, cool conditions, guaranteeing longevity and effectiveness for diverse applications. Its purity and physical characteristics, such as a boiling point of 141C and refractive rate of 1.386, make it ideal for precise industrial processes.
FAQ's of A Propionic Acid (79-09-4A ):
Q: How is propionic acid typically produced?
A: Propionic acid is manufactured either by oxo synthesis, utilizing ethylene, carbon monoxide, and hydrogen, or through the fermentation of specific bacteria like Propionibacterium. Both processes ensure high-purity outputs suitable for food and industrial grades.
Q: What are the main benefits of using propionic acid as a preservative?
A: Propionic acid prevents mold development and spoilage in animal feed and bakery products. Its ability to maintain freshness and extend shelf life without imparting negative flavors makes it indispensable in the food industry.
Q: When should propionic acid be stored and handled with extra care?
A: Proper storage is critical, as propionic acid should be kept in a dry, cool place to preserve its stability. Careful handling is recommended due to its pungent smell and acidic nature, which can irritate skin or mucous membranes.
Q: Where is propionic acid primarily used?
A: Propionic acid is widely utilized in food preservation, animal nutrition, the production of cellulose acetate propionate plastics, and as an intermediate in pharmaceuticals, flavors, and fragrances industries. Its use extends globally, with India acting as a key exporter.
Q: What is the process behind propionic acid's application in food preservation?
A: In food preservation, propionic acid is added directly to products such as animal feed and bakery items. Its inherent acidity (pH 2.5) disrupts the growth of molds and bacteria, ensuring longer shelf life and product safety.
Q: How does the solubility of propionic acid enhance its industrial application?
A: Propionic acid's ability to readily dissolve in water and various solvents (alcohol, ether, chloroform) facilitates its integration into numerous chemical processes. This characteristic allows for seamless mixing, dilution, and reactivity in both food and industrial formulations.