醚基功能化离子液体催化合成乙酸正丁酯

合成了5种醚基功能化酸性离子液体Me（OEt）₁-MOR-C₃SO₃H]MeSO₃]、Me（OEt）₂-MOR-C₃SO₃H]MeSO₃]、Me（OEt）₃-MOR-C₃SO₃H]MeSO₃]、2（C₃SO₃H-MOR）-（OEt）₂₀₀]2MeSO₃]、2（C₃SO₃H-MOR）-（OEt）₄₀₀]2MeSO₃]，使用红外光谱和核磁共振氢谱对合成的离子液体结构进行表征，考察离子液体的黏度、溶解性和腐蚀性。以正丁醇和乙酸的酯化反应考察了离子液体的催化活性，并使用响应面分析法优化反应工艺。结果表明，当酸醇摩尔比为1.2：1、催化剂2（C₃SO₃H-MOR）-（OEt）₄₀₀]2MeSO₃]用量为醇质量的5%、带水剂用量为醇质量的16%时，在90℃下反应5 h，酯收率可达97.8%，离子液体经回收干燥重复使用8次催化活性没有明显的降低。

Synthesis of n-butyl acetate by ether-functionalized ionic liquid

Five ether-functionalized ionic liquids(ILs), containingMe(OEt)₁-MOR-C₃SO₃H]MeSO₃], Me(OEt)₂-MOR-C₃SO₃H]MeSO₃], Me(OEt)₃-MOR-C₃SO₃H]MeSO₃], 2(C₃SO₃H-MOR)-(OEt)₂₀₀]2MeSO₃]and2(C₃SO₃H-MOR)-(OEt)₄₀₀]2MeSO₃] were synthesized and characterized by the Fourier transform infrared spectrometer and nuclear magnetic resonance spectrometer.The ionic liquid viscosity, solubility and corrosion were investigated.The promotion effect of ether-functionalized ILs in esterification of acetic acid with butyl alcohol was investigated and the reaction process was optimized using response surface analysis.The yield of n-butyl acetate was up to 97.8% under the optimized conditions:response surface analysis(RSA) of n(CH₃COOH):n(C₄H₉OH)=1.2:1, the mass of catalyst2(C₃SO₃H-MOR)-(OEt)₄₀₀]2MeSO₃]was 5% of the quality of butyl alcohol, the mass of water carrying agent was 30% of the quality of butyl alcohol, temperature was 90℃, and reaction time was 5 h.The catalysts could be recycled for 8 times without obviously decline of catalytic activity.