四氢呋喃-乙醇-离子液体三组分物系汽液平衡  

Vapor-liquid equilibrium for three-component system of tetrahydrofuran-ethanol-ionic liquid

作　　者：李贞玉[1] 刘洪宇[1] 朴明俊 

机构地区：[1]长春工业大学化工学院,吉林长春130012

出　　处：《化学工程》2011年第8期48-52,共5页Chemical Engineering(China)

摘　　要：在100 kPa下,用汽液平衡釜测定了含离子液体1-辛基-3-甲基咪唑四氟硼酸盐([OMIM]BF4)的四氢呋喃-乙醇物系的等压汽液平衡数据。所测得的汽液平衡数据符合热力学一致性检验。利用UNIFAC方程对实验数据进行了关联,计算值与实验值的平均偏差为0.007,说明UNIFAC模型关联结果与实验结果吻合很好。实验结果表明:加入[OMIM]BF4使汽液平衡线偏离四氢呋喃-乙醇二组分的汽平衡线,[OMIM]BF4摩尔分数越高,偏离程度越大;[OMIM]BF4改变四氢呋喃-乙醇物系的相对挥发度,消除了四氢呋喃-乙醇物系的共沸点;随着离子液体[OMIM]BF4摩尔分数的增加,四氢呋喃对乙醇的相对挥发度增加。离子液体[OMIM]BF4可以作为四氢呋喃-乙醇物系萃取精馏的溶剂,适宜的[OMIM]BF4摩尔分数为30%。The isobaric vapor-liquid equilibrium data for ionic liquid （IL） 1-octyl-3-methylimidazolium tetrafluororate （ [ OMIM ] BF4 ） in tetrahydrofuran-ethanol system was measured in a vapor-liquid equilibrium still under 100 kPa. UNIFAC equation was used to correlate the experimental data. The mean deviation between the values of calculation and experiments is 0. 007, which indicates that UNIFAC model fits the experimental result highly. The vapor-liquid equilibrium curve of tetrahydrofuran-ethanol system containing [ OMIM ] BF4 deviates from that of IL-free two-component system. The deviation increases with increasing mole fraction of [ OMIM ] BF4. Addition of [ OMIM ] BF4 changes the relative volatility of tetrahydrofuran-ethanol system, and leads to disappearance of the azeotropie point, and the relative volatility for tetrahydrofuran to ethanol increases with increasing of [ OMIM ] BF4. [ 0MIM ] BF4 can be used as a solvent of extractive distillation for tetrahydrofuranethanol system. The optimum mole fraction of [ OMIM] BF4 is about 30%.

关 键 词：汽液平衡 四氢呋喃 乙醇 1-辛基-3-甲基咪唑四氟硼酸盐 UNIFAC方程 

分 类 号：TQ013.1[化学工程]