n-Butanol, also known as 1-butanol or butanol, is a type of alcohol. Each molecule has four carbon atoms and its molecular formula is CH3CH2CH2CH2OH. There are three isomers, namely isobutanol, sec-butanol and tert-butanol. It is a colorless liquid with a wine odor at room temperature. Its boiling point is 117.7°C, density (20°C) is 0.8109g/cm3, freezing point is -89.0°C, flash point is 36~38°C, and autoignition point is 689F. Refractive index (nChemicalbook20D) is 1.3993. Its solubility in water at 20°C is 7.7% (by weight), and its solubility in n-butanol is 20.1% (by weight). It is miscible with ethanol, ether and many other organic solvents. Its vapor forms an explosive mixture with air, and its explosion limit is 3.7%~10.2% (volume fraction). n-Butanol is the raw material for producing the plasticizer dibutyl phthalate, and is also used to make solvents for butyl acrylate, butyl acetate, and ethylene glycol butyl ether.