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Sec-butanol (also known as 2-butanol, sec-butanol, or sec -butanol) is a branched-chain aliphatic secondary alcohol. Its chemical name is 2-butanol, with the molecular formula C₄H₁₀O and a molecular weight of 74.12. It is a colorless, transparent, flammable liquid with a distinctive odor similar to that of wine. It is soluble in water (approximately 12.5 g/100 mL) and readily soluble in organic solvents such as alcohols and ethers. As an important organic chemical intermediate, as well as an excellent solvent and fine chemical raw material, it is widely used in coatings, inks, pharmaceuticals, fragrances, and other fields.
| Item | Specification |
| Melting Point | -114.7°C |
| Boiling Point | 99.5°C |
| Density | 0.808 g/mL at 25°C(lit.) |
| Flash point | 24°C |
| Vapor pressure | 1.33-1.6 kPa(20°C) |
| Refractive index | n 20/D 1.397(lit.) |
| Water Solubility | 12.5 g/100 mL(20°C) |
| Stability | Stable at room temperature; readily dehydrogenates upon heating to form methyl ethyl ketone. |
Chemical Synthesis: Sec-Butanol is primarily used for dehydrogenation to produce methyl ethyl ketone; can also be used in esterification and amination reactions to synthesize fine derivatives of esters and amines.
Industrial Solvent: 2 Butanol is used as a solvent for formulating paints and inks, preparing cleaning agents and paint strippers, and for material extraction and separation operations.
Pharmaceutical and Fragrance: Butan-2-ol is used as an intermediate in drug synthesis and as a raw material for food flavorings and personal care fragrances.
Other Applications: Sec-Butyl alcohol serves as a reagent in chromatographic analysis and is used in small quantities as a fuel modifier.
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