Propionic acid is a three-carbon carboxylic acid with a molecular formula of CH3CH2COOH. It is a clear, colorless liquid with a pungent odor. It is commercially manufactured by the hydrocarboxylation of ethylene in the presence of nickel carbonyl catalyst. Propionic acid and derivatives are largely used as feed and food preservatives. It inhibits the growth of molds and bacteria. Propionic acid is also used to make some specialized propionates, such as cellulose acetate propionate (CAP), which is a useful thermoplastic. The other applications of propionic acid and derivatives include herbicides, pharmaceuticals, and solvents. Propionic acid may cause irritation to the human body in case of contact...
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