离子液体助催化合成醋酸乙烯

以醋酸汞为催化剂，在乙炔空速（152~164） h-1、冰醋酸用量20 mL、常压和85 ℃条件下，均相催化反应4 h合成醋酸乙烯,产率仅约3.5%。实验得出最优化醋酸汞用量为10 mmol，在最优化条件下探索了离子液体1-乙基-3-甲基咪唑醋酸盐（［emim］OAc）作为助剂改善均相催化体系对醋酸乙烯产率和选择性的影响。［emim］OAc加入量为15 mmol时，醋酸乙烯产率提高至16.5%，选择性达80.7%。密度泛函数理论模拟计算得出离子液体的加入能促进乙炔分子的CC键和键角发生变化，证明其有助于活化乙炔分子。傅里叶红外光谱和差热热重分析经过洗涤的反应沉淀物，发现离子液体很容易被洗掉。

Ionic liquid co-catalysis for synthesis of vinyl acetate

Using mercury acetate as the catalyst in homogeneous process, vinyl acetate was synthesized under the condition of acetic acid amount 20 mL, acetylene space velocity （152 -164） h-1, atmosphere pressure ,reaction temperature 85 ℃ and reaction time 4 h. The effect of Hg（OAc） 2 amount was investi- gated. The vinyl acetate yield of 3.5% was attained when Hg（ OAc）2 optimal dosage was 10 mmol. Then the effects of molar ratio of ionic liquid emim] OAc to Hg（OAc） 2 on the yield of vinyl acetate and the selectivity to vinyl acetate were studied. The results showed that emim ] OAc and Hg （OAc） 2 were effi- and ）： and and C2H2,resulted in the activation of C2H2 molecules and improved the experiment effect. The precipitate formed during reaction after washing was analyzed by FT-IR and DTG, and it was found that ionic liquid in the precipitate was washed away easily.