Propionic Acid

Cas Number


Other Names

Propionic acid,

Ethanecarboxylic acid

The formula



Propionic acid (from the Greek words protos, meaning "first", and pion, meaning "fat"; also known as propanoic acid) is a naturally occurring carboxylic acid. It is a liquid with a pungent and unpleasant smell somewhat resembling body odor. The anionCH3CH2CO2− as well as the salts and esters of propionic acid are known as propionates (or propanoates).

Physical and Chemical Properties
Physical state and Appearance: Liquid
Molecular Weight: 74.08 g/mole
pH (1% soln/water): 5 [Acidic.]
Boiling Point: 140.99°C (285.8 °F)
Flash point: 54 °C
Melting Point: -20.8°C (-5.4 °F)
Specific Gravity: 0.9954 (Water = 1)
Vapor Pressure: 2.9 mm of Hg (@ 20 °C)
Vapor Density: 2.56 (Air = 1)
Ionicity (in Water): See solubility in water.
Dispersion Properties: Easily soluble in cold water.
Purity (as water free), %: 99.5
Water, %: 0.1

1. Used as preservative for both animal feed and food for human consumption

2. It is major used as a preservative in baked goods

3. It is widely used as a intermediate in the production of other chemicals, especially polymers

4. Use to make pesticides and pharmaceuticals

5. Use as solvents or artificial flavorings

6. It is also used in anti-fungal foot powders & to modify synthetic cellulose fibers