(1)乙醇与氢溴酸共热 CH3CH2OH + HBr ==> CH3CH2Br + H2O (2)乙醇与溴化钠硫酸共热 NaBr + H2SO4 == NaHSO4 + HBr CH3CH2OH + HBr ==> CH3CH2Br + H2O