甲醇-乙腈-l-丁基-3-甲基咪唑四氟硼酸盐三组分物系的汽液平衡

在101.32 kPa下,用CE-2型Othmer汽液平衡釜测定了甲醇-乙腈-l-丁基-3-甲基咪唑四氟硼酸盐(bmim]BF4)三组分物系的等压汽液平衡数据;采用UNIFAC方程对实验数据进行了关联。实验结果表明,与未加入bmim]BF4相比,加入bmim]BF4后甲醇-乙腈二组分物系的汽液平衡线产生偏离,bmim]BF4含量越高,偏离程度越大;bmim]BF4具有明显的盐析效应,当bmim]BF4的含量为10%(x)时,甲醇-乙腈物系的共沸点消失;UNIFAC方程可用于预测甲醇-乙腈-bmim]BF4三组分物系的汽液平衡。

Vapor-Liquid Equilibrium for Methanol-Acetonitrile-1-Butyl-3-Methylimidazolium Tetrafluoroborate Ternary System

Isobaric vapor-liquid equilibrium for methanol-acetonitrile-1-butyl-3-methylimidazolium tetrafluoroborate(BF4) ternary system was measured at 101.32 kPa using CE-2 Othmer vapor-liquid equilibrium still.UNIFAC equations were used to correlate the experimental data.The experimental results indicated that the vapor-liquid equilibrium curves of the methanol-acetonitrile-BF4 system deviated from that of the BF4-free system and the deviation increased with the increase of the BF4 dosage.The ionic liquid BF4 exhibited notable salt-out effect which could enhance the relative volatility.When the mole fraction of BF4 amounted to 10%,the azeotropic point disappeared.UNIFAC equation can be used to predict the equilibrium of methanol-acetonitrile-BF4 system.