离子液体[BMIM]BF_4+H_2O汽液相平衡实验研究  

EXPERIMENT ON VAPOR-LIQUID PHASE EQUILIBRIUM OF [BMIM]BF_4+H_2O SYSTEM

作　　者：关婷婷[1] 孙立[1] 皇甫立霞[1] 郭开华[1] 

机构地区：[1]中山大学工学院,广州510006

出　　处：《低温物理学报》2011年第3期194-198,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金(51076169)资助的课题~~

摘　　要：离子液体[BMIM]BF4具有较高的热稳定性,且与水有很好的互溶性,其水溶液在分离、萃取等化工和制冷、热泵等吸收式能量转换系统中的应用受到重视,急需较完整的相平衡实验数据.本文对离子液体[BMIM]BF4+H2O二元体系的汽液相平衡(蒸汽压)特性进行较大温度和压力范围的测定.测试系统采用了双温浴控温方式,获得较高测试精度和稳定性.实验获得的蒸汽压数据温度范围为284K^433K、压力范围为0.8~320 kPa、[BMIM]BF4摩尔分数分别为0.888、0.720、0.602、0.418.本实验测量系统的压力不确定度小于±0.02 kPa,温度不确定度小于±10mK,测得的相平衡数据有较好的可靠性和精度,为其工业应用提供了可靠和较完整的数据基础.Ionic liquid,1-butyl-3-methylimidazolium tetrafluoroborate（[BMIM]BF4）,has a great thermal stability and a good solubility with water,and have attracted a significant attention for chemical engineering and absorption energy conversion applications,such as separation,extraction,refrigeration and heat pumps.In this paper,the vapor-liquid phase equilibrium of [BMIM]BF4 ＋ H2O binary system was tested in a wide temperature and pressure range.The vapor pressure data was obtained in temperature range of 284~433K,pressure range of 0.8~320 kPa,and BF4 mole fraction of 0.888,0.720,0.620 and 0.418.The experimental setup used is a double bath temperature control technique and has high accuracy and reliability.The pressure uncertainty is less than ± 0.02 kPa and the temperature uncertainty less than ± 10 mK.The phase equilibrium test data of the binary system has good consistency and reliability and can provide a reliable and comprehensive base for industrial applications.

关 键 词：离子液体 [BMIM]BF4+H2O 蒸汽压 相平衡特性 

分 类 号：O552.422[理学—热学与物质分子运动论]