Abstract:

The ionic liquid 1-butyl-3-methylimidazolium chloride（Bmin[Cl]）was selected as the solvent to separate azeotropic mixture of acetonitrile-water. Isobaric vapor-liquid equilibrium data for acetonitrile-water system containing ionic liquid Bmin[Cl] were measured at 0.101 MPa. The azeotropic point of acetonitrile - water can be eliminated by adding ionic liquid Bmin[Cl]，and relative volatility of acetonitrile to water can be increased.  By using the modified Furter equation of the VLE for mixed-solvent electrolyte systems，the parameters of salt-effection of ionic liquid Bmin[Cl] to acetonitrile-water system was correlated.

摘要：

选择离子液体1-丁基-3-甲基咪唑氯盐（Bmin[Cl]）作为分离乙腈-水共沸物系的溶剂。在0.101MPa下测定了在离子液体Bmin[Cl]含量为10%、20%和30%时乙腈-水物系的汽液平衡数据。实验结果表明，离子液体Bmin[Cl] 可以提高乙腈对水的相对挥发度，离子液体Bmin[Cl]含量在20%以上时可以消除乙腈-水物系的共沸点。离子液体Bmin[Cl]可以用作分离乙腈-水物系的萃取剂。用改进的Furter方程对数据进行了关联，得到了离子液体Bmin[Cl]对乙腈-水物系的盐效应参数。