Propionic acid is an important chemical raw material. Propionic acid and its derivatives are widely used in the synthesis of tree esters, grain preservation, food and feed additives, spices.
The earliest propionic acid was prepared by condensation and separation from the gas produced by charcoal manufacturing and coal coking. In the 1950s, foreign countries developed the process of producing acetic acid by oxidation of light hydrocarbons. The product contains about 10% (propionic acid), which is obtained after separation and purification. In addition to the hydrocarbon oxidation method, the United States also has the method of carbonylation of ethylene, CO and H2 to synthesize propionaldehyde and further oxidation to propionic acid. Due to the development of low-pressure carbonylation process with rhodium phosphine complex as catalyst, propionaldehyde oxidation method has developed rapidly in recent years. This method is superior to the traditional high-pressure method with carbonyl cobalt as catalyst. 

Propionic acid, a saturated monocarboxylic acid containing three carbon atoms, one of the typical volatile lower fatty acids. Chemical formula CH3CH2COOH. Molecular weight 74.08. Colorless clear oily liquid with unpleasant rancidity and pungent odor.
Melting point -20.8ºC,
Boiling point 140.99, 41.65(1330Pa),
Relative density 0.9930,
Refractive index 1.3869.
Ka = 1.34 x 10-5.

Propionic acid is widely used in the food industry can be used in the production of calcium propionate, sodium propionate and other preservatives, can also be used in the production of propionate flavor and fragrance.

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The global propionic acid market is divided by application, terminal industry and region. According to the application, the market is divided into herbicides, rubber products, plasticizers, food preservatives, etc., and food preservatives contribute the most to the market. Most people like the ready-to-eat food on the market. These foods contain propionic acid as an additive and preservative to maintain quality and reduce spoilage, which increases the demand for food preservatives. In addition, the surge in demand for food preservatives has promoted the growth of the global propionic acid market. Increasing demand for natural preservatives has driven the growth of this market.

The global propionic acid market is divided by application, terminal industry and region. According to the application, the market is divided into herbicides, rubber products, plasticizers, food preservatives, etc., and food preservatives contribute the most to the market. Most people like the ready-to-eat food on the market. These foods contain propionic acid as an additive and preservative to maintain quality and reduce spoilage, which increases the demand for food preservatives. In addition, the surge in demand for food preservatives has promoted the growth of the global propionic acid market. Increasing demand for natural preservatives has driven the growth of this market.