Propanoic acid can be as a preservative for both animal feed and food for human consumption,also as a preservative in baked goods. Besides, it is also useful as an intermediate in the production of other chemicals, especially polymers. What's more, it is also used to make pesticides and pharmaceuticals. There are some basic informations about this crude drug: (1)CAS No.: ; (2)Other Names: propanoic acid; (3)MF: C₂H₅COOH; (4)EINECS No.: 201-176-3(5)Appearance:colorless liquid.