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Purity is the most critical indicator for industrial propionic acid, directly affecting the efficiency of subsequent reactions and the quality of the final product. Premium grade requires a minimum propionic acid content of 99.5%, while first grade requires at least 99.0%. Insufficient purity can lead to increased side reactions, reduced conversion rates in esterification processes, and poor coating quality in electroplating applications.
The color index reflects the amount of oxidation products and impurities in the product, with premium grade requiring no more than 10 platinum-cobalt Hazen units. Moisture content is particularly important for water-sensitive reactions, such as the production of propionyl chloride, where excessive moisture can reduce yield and generate corrosive hydrogen chloride gas. The evaporation residue index primarily controls non-volatile inorganic salts, which can cause coking in high-temperature applications.Propionic Acid.