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Propionic acid is produced industrially via two main routes: chemical synthesis and biological fermentation. Products are classified into industrial grade, food grade, and feed grade based on purity to meet different application requirements.
Propionic acid Production Methods and Grades
(1) Chemical Synthesis: The dominant industrial processes are the ethylene carbonylation (Reppe process) and propionaldehyde oxidation. The former uses ethylene, carbon monoxide, and water as raw materials, reacting under catalysts to produce propionic acid with purity exceeding 99.5%.
(2) Biological Fermentation: Propionic acid is produced by fermenting sugars or lactic acid using microorganisms such as Propionibacterium. This is a green process with mild conditions, but production costs are relatively high, and the product purity is typically suited for specific applications.