N-Butanol is an organic compound with the chemical formula CH3(CH2)3OH, which is a colorless and transparent liquid that emits a strong flame when burning. It has an odor similar to fusel oil, and its vapor is irritating and can cause coughing. The boiling point is 117-118 ° C, and the relative density is 0.810. 63% n-butanol and 37% water form an azeotrope. Miscible with many other organic solvents. It is obtained by fermentation of sugars or by catalytic hydrogenation of n-butyraldehyde or butenal. Used as a solvent for fats, waxes, resins, shellac, varnishes, etc., or in the manufacture of paints, rayon, detergents, etc.