Stearic acid, also known as octadecanoic acid, is a saturated long-chain fatty acid with a straight chain structure composed of 18 carbon atoms. Its chemical formula is C17H35COOH (C18H36O2). Stearic acid is widely present in nature, especially in animal fats and certain vegetable oils. It appears as a white solid at room temperature, colorless and odorless, with low water solubility and high organic solvent solubility.
Physical and chemical properties
The density of stearic acid is 0.84 g/cm ³, the melting point is 67-72 ºC, the boiling point is 361 ºC, the vapor pressure is 1 mm Hg (173.7 ºC), and the refractive index is 1.4299. It is slightly soluble in cold water, but soluble in organic solvents such as alcohol, acetone, benzene, chloroform, ether, carbon tetrachloride, carbon disulfide, pentyl acetate, and toluene.
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