2butanoni

2-Butanone, commonly called sec-butanone or methyl ethyl ketone (MEK), is an organic compound with the formula CH3-CO-CH2-CH3. It is a colorless, volatile liquid with a characteristic sweet, fruity odor. As a ketone, it is a medium-polar solvent and is miscible with many organic solvents; it is soluble in water to a limited extent and evaporates readily. Its boiling point is about 79.6 °C and it is flammable.

Industrial production of 2-butanone is mainly by oxidation of 2-butanol (sec-butanol) over suitable catalysts, yielding 2-butanone and water. It can also be produced via other oxidation or dehydrogenation routes in petrochemical processing streams.

Uses of MEK are broad and commercial. It is a major solvent for coatings, paints, inks, and adhesives due to its ability to dissolve a wide range of resins and its relatively fast evaporation. It is also employed as an intermediate in organic synthesis and as a feedstock for the production of methyl ethyl ketone peroxide, an initiator used in polymerization processes.

Safety and handling considerations are important. MEK is highly flammable, and its vapors can form explosive mixtures with air. Inhalation or skin contact can irritate the eyes, skin, and respiratory tract; prolonged exposure may cause headaches, dizziness, or central nervous system effects. It should be used in well-ventilated areas with appropriate personal protective equipment, and stored away from heat and ignition sources in tightly closed containers.

Environmental impact includes its classification as a volatile organic compound; releases should be managed to minimize air and water contamination, and spills should be contained and cleaned up promptly.