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Basic Properties and Industrial Applications of Propionic Acid
Propionic acid (propanoic acid) is a short-chain saturated fatty acid with the chemical formula CH₃CH₂COOH and CAS number 79-09-4. At room temperature, it is a colorless, transparent liquid with a pungent odor, a density of approximately 0.99 g/cm³, a boiling point of 141°C, and a melting point of -21°C. Industrial-grade propionic acid is mainly used in the following fields:
As an intermediate in organic synthesis to produce derivatives such as propionates and esters;
As a plasticizer and solvent in the plastics industry;
In the electroplating industry for preparing nickel-plating solutions;
As a preservative in the feed and food industries;
As a synthetic intermediate in the pharmaceutical and pesticide sectors.
Different application scenarios have different priorities for propionic acid quality. For example, propionic acid used in electroplating has strict requirements for metal ion content, while feed additives focus more on biological safety.