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1-羟乙基-3-甲基咪唑氯盐水溶液蒸汽压和凝固特性研究
周岚郭开华陈莹赵天宇皇甫立霞吴明军黄标
0
(中山大学工学院,广州 510006)
摘要:
1-羟乙基-3-甲基咪唑氯盐([HOEtMIM][Cl])是一种亲水性极强的离子液体,与水可以组成吸收式制冷工质对,具有良好的工业应用前景。在制冷工程应用中,离子液体水溶液的低温特性研究非常重要,包括低温段的水溶液蒸汽压数据和凝固特性,而[HOEtMIM][Cl]的相关研究缺乏。本文对水的质量分数分别为17.10%、24.29%、38.03%、49.89%、69.94%,温度范围(278.15 K~408.15 K)的[HOEtMIM][Cl]水溶液的汽液相平衡进行了测定;并对水的质量分数范围为1.3%~90.0%,温度范围为150 K~360 K的离子液体水溶液的凝固特性进行了测定,揭示其在低温应用时可能出现的固化问题。获得的蒸汽压及凝固特性数据对该离子液体水溶液应用于制冷系统设计具有重要意义。
关键词:  离子液体,水溶液,低温,蒸汽压,凝固特性
DOI:
基金项目:国家自然科学基金项目(批准号:51076169);广东省自然科学基金重点项目(批准号:9251027501000001)资助的课题
Vapor pressure and freeze properties of 1-(2-hydrpxylethyl)- 3-methylimidazolium chloride aqueous solution
ZHOU Lan GUO Kaihua CHEN Ying ZHAO Tianyu HUANGFU Lixia WU Mingjun HUANG Biao
(Sun Yat-Sen University, School of Engineering, Guangzhou 510006, Guangdong, China)
Abstract:
1-(2-hydrpxylethyl)-3-methylimidazolium chloride ([HOEtMIM][Cl]) is a functional ionic liquid (IL) which has good absorption for water and its aqueous solution can be employed as working pair of absorption refrigeration cycle. Due to the lack of its property study under low temperature, it is important to study the vapor-liquid equilibrium(VLE) and the solid-liquid equilibrium(SLE) properties of its aqueous solutions for industrial promotion. The vapor pressures of the binary system was measured at 278.15 K -408.15 K and the mass fraction of water range of 17.10%-69.94%. An activity coefficient model with an idle factor for association of IL moles was applied and it can effectively correlate the experimental data with a mean relative deviation of 3.2%. The solid-liquid equilibrium of [HOEtMIM][Cl] aqueous solutions were measured at 150 K-360 K with the mass fraction of water range of 1.3%-90.0%. In this study, reliable experimental data on the vapor-liquid equilibrium and solid-liquid equilibrium of [HOEtMIM][Cl] aqueous solutions were obtained, respectively,which provides good references for the industrial application of this kind of aqueous solution.
Key words:  ionic liquid, aqueous solution, vapor pressure, freeze property

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