High-pressure phase behavior of systems with ionic liquids: Part V. The binary system carbon dioxide+1-butyl-3-methylimidazolium tetrafluoroborate
High-pressure phase behavior of systems with ionic liquids: Part V. The binary system carbon dioxide+1-butyl-3-methylimidazolium tetrafluoroborate
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DOI：
10.1021/je049753h
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发表时间：
2005
影响因子：
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通讯作者：
M. Kroon;A. Sarabi;M. Costantini;J. V. Spronsen;G. Witkamp;R. Sheldon;C. Peters
中科院分区：
文献类型：
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作者：
M. Kroon;A. Sarabi;M. Costantini;J. V. Spronsen;G. Witkamp;R. Sheldon;C. Peters
实验研究了超临界流体二氧化碳（CO2）与离子液体1-丁基-3-甲基咪唑四氟硼酸盐（[bmim][BF4]）二元体系的相行为。采用合成方法对其相行为进行了测量。本文报道了CO2 + [bmim][BF4]系统在（10.22 ~ 60.17）摩尔%的二氧化碳浓度和（278.47 ~ 368.22）k的温度范围内的气泡点压力。CO2 + [bmim][BF4]二元系统具有两相液-汽区，延伸到非常高的压力。根据Scott和Van Konynenburg的分类，最有可能的是流体行为类型为III型。将得到的实验结果与现有的二元体系CO2 + 1-己基-3-甲基咪唑四氟硼酸盐（[hmim][BF4]）相行为数据进行比较，探讨烷基长度对该类体系相行为的影响。烷基越多，气泡点p越低。
The phase behavior of the binary system consisting of the supercritical fluid carbon dioxide (CO2) and the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) was studied experimentally. A synthetic method was used to measure its phase behavior. Bubble-point pressures of the system CO2 + [bmim][BF4] are reported for carbon dioxide concentrations ranging from (10.22 to 60.17) mole % and within a temperature range of (278.47 to 368.22) K. The CO2 + [bmim][BF4] binary system has a two-phase liquid−vapor region extending up to very high pressures. Most likely, the type of fluid-phase behavior is type III according to the classification of Scott and Van Konynenburg. The experimental results obtained were compared with the available phase behavior data of the binary system CO2 + 1-hexyl-3-methylimidazolium tetrafluoroborate ([hmim][BF4]) to investigate the effect of the length of the alkyl group on the phase behavior of this type of system. A larger alkyl group leads to lower bubble-point p...