main industrial uses of propanoic acid (CAS 79-09-4)
Food Industry
Propanoic acid (CAS 79-09-4) plays an important role as a preservative. In bread production, propionic acid and its salts can effectively inhibit the growth of microorganisms, especially molds.
In bakery environments where various spoilage-causing microbes are present, the addition of propionic acid helps extend the shelf life of bread and other baked goods.
For example, by adding calcium propionate to regular bread, the shelf life can be extended from 2–3 days to 5–7 days at room temperature, ensuring stable product quality during distribution and reducing losses caused by microbial contamination.
Feed Industry
Propanoic acid (CAS 79-09-4) is widely used as a preservative for silage. Without proper preservation, silage can easily be damaged by harmful microorganisms during storage. Propionic acid lowers the pH, creating an acidic environment that inhibits the growth of undesirable microbes.
In corn silage, the addition of propionic acid effectively suppresses harmful bacteria such as Clostridium (butyric acid bacteria), helps maintain the nutritional value and palatability of the silage, encourages livestock to consume more, improves feed utilization, and enhances overall farming efficiency.
Chemical Industry
Propanoic acid is an important raw material for organic synthesis, especially for producing propionate esters.
Ethyl propionate, one of the common esters, has a pineapple-like aroma and is widely used in food flavors and cosmetic fragrances.
In perfumery, ethyl propionate adds a fresh fruity note and enriches scent layers. Many classic fruity perfumes rely on this ingredient to deliver a clean, refreshing aroma.
Plastics & Materials
Propionic acid is also used to produce cellulose propionate, a material known for excellent film-forming properties and water resistance. It is widely used in the plastics industry.
Cellulose propionate is commonly used to manufacture eyeglass lenses due to its good optical clarity, lightweight nature, flexibility, and impact resistance. These features ensure comfortable wear and better eye protection in various daily-use scenarios.
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