2-Butanol, or sec-butanol, is a chemical compound with formula C4H10O. This secondary alcohol is a flammable, colorless liquid that is soluble in 12 parts water and completely miscible with polar organic solvent such as ethers and other alcohols. Sec-butyl alcohol appears as a clear colorless liquid with an alcohol odor. 2-butanol is used as a solvent, it is mainly converted to butanone (methyl ethyl ketone, MEK), which is an important industrial solvent and found in many domestic cleaning agents and paint removers.