Butanol or butyl alcohol (sometimes also called biobutanol when produced biologically),'s a primary alcohol with a 4 carbon structure and the molecular formula of C4H9OH. It belongs to the higher alcohols and branched-chain alcohols. It's primarily used as a solvent, as an intermediate in chemical synthesis, and as a fuel. There're four isomeric structures for butanol. Isomers The unmodified term butanol usually refers to the straight chain isomer with the alcohol functional group at the termin… (More on Butanol)