乙烯在浓硫酸作用下生成硫酸单乙酯,后者在稀释时发生水解生成乙醇和硫酸CH2=CH2+H2SO4==CH3CH2OSO3HCH3CH2OSO3H+H2O==CH3CH2OH+H2SO4总反应:CH2=CH2+H2O==CH3CH2OH
CH2 = CH2 + H2O → CH3CH2OH (条件:加热140℃、催化剂)