Synthesis of Terpinol Catalyzed by Octadecylamine Ethoxylates Ionic Liquid

Seven acidic ionic liquids were synthesized using octadecylamine ethoxylates(AC 1812,AC 1815,AC 1820,AC 1830) as cation and characterized by FT-IR,1H NMR and 13C NMR.The ionic liquids were used as catalyst in synthesis of terpinol by hydration of α-pinene.It was found that the ionic liquid polyoxyethylene octadecylamine ether sulphate(+-) was an excellent catalyst for synthesis of terpinol.Using this ionic liquid as catalyst,the effects of reaction conditions on α-pinene hydration results were investigated.The obtained optimum conditions were n(α-pinene):n(ionic liquid):n(chloroactic acid):n(water)=1:0.05:1:5,n(α-pinene)=0.06 mol,reaction temperature 80 ℃ and reaction time 8 h.Under the optimum conditions,the conversion of α-pinene was 94.0 % and the yield of terpinol was 59.8 %.When the catalyst was reused for 5 times,the conversion of α-pinene and the yield of terpinol were still 91.5 % and 56.8 % respectively.