2-Butanol, or sec-butanol, is an organic compound with formula CH3CH(OH)CH2CH3. This secondary alcohol is a flammable, colorless liquid that is soluble in 3 parts water and completely miscible with polar organic solvents such as ethers and other alcohols. It is produced on a large scale, primarily as a precursor to the industrial solvent methyl ethyl ketone. 2-Butanol is chiral and thus can be obtained as either of two stereoisomersdesignated as (R)-(−)-2-butanol and (S)-(+)-2-butanol. It is normally found as an equal mixture of the two stereoisomers — a racemic mixture.
|Molar mass||74.12 g mol−1|
|Density||0.808 g cm−3|
|Melting point||-115 °C, 158 K, -175 °F|
|Boiling point||98-100 °C, 371-373 K, 208-212 °F|
|Solubility in water||290 g dm−3|
|Vapor pressure||1.67 kPa (at 20 °C)|
|Refractive index (nD)||1.3978 (at 20 °C)|
- SBA is used as a raw material for lube additives (antiwear agents).
- SBA is used as a coupling agent in water-reducible coatings, industrial cleaning formulations and paint removers.
- SBA can also be used as an intermediate in the manufacturing of various surfactants, hydraulic fluids, pesticides, mining chemicals and adhesives.
- Secondary butyl alcohol is a solvent for ester gum, many natural resins and vegetable oils.
- In the presence of aromatic hydrocarbons it forms a good solvent mixture for alkyd coatings and lacquers based on ethyl cellulose.
- As a latent solvent in nitrocellulose lacquers, it provides good gloss and leveling properties.
- Sec-butyl alcohol also acts as a chemical intermediate in the manufacture of methyl ethyl ketone, ore flotation agents, fruit essences, perfumes, dye-stuffs and wetting agents.
- Other uses for sec-butyl alcohol are as a solvent in the manufacture of polypropylene, for special greases, in printing inks and in adhesives for plywood laminates.