醚基咪唑离子液体的汽化焓和极性研究

发布时间：2018-04-09 13:58

本文选题：醚基咪唑离子液体　切入点：热重红外联用　出处：《辽宁大学》2017年硕士论文

【摘要】：文章中合成了疏水性离子液体1-乙基甲基醚-3-甲基咪唑双三氟甲基磺酰亚胺离子液体和1-乙基乙基醚-3-甲基咪唑双三氟甲基磺酸亚胺离子液体。对这两种醚基咪唑离子液体以及对应的中间体1-乙基甲基醚-3-甲基咪唑溴盐和1-乙基乙基醚-3-甲基咪唑溴盐进行核磁共振氢谱(~1HNMR),核磁共振碳谱(~(13)CNMR)分析表征,TG的谱图分析后确定该中间体以及最终产物无杂质为目标离子液体。在过去的研究中,使用TGA方法测定离子液体汽化焓,有人提出高温恒温温度段中离子液体可能发生分解。本文的创新点是使用TG IR在与TG实验相同的实验条件下,测出每一个恒温温度段中,挥发出气体的红外谱图。通过对不同温度段获得的红外谱图的对比,佐证离子液体未发生分解,推测离子液体分解温度。进而使用TGA分析方法,通过恒温温度段范围内的失重量,测定离子液体的平均温度的汽化焓。Verevkin等人发表的文章中提出过在统计热力学基础上能够计算出离子液体气态和液态的热容差△_1~gC_(p·m)。利用计算出离子液体的气态和液态热容差,从而将使用TGA计算出离子液体平均温度的汽化焓转化为298K的汽化焓,估算出其他温度的汽化焓。除此之外,本文测定[MOEmim][NTf_2]和[EOMmim][NTf_2]离子液体极性δ_μ。同时分别估算两种醚基咪唑离子液体的不同温度的离子液体的汽化焓、汽化熵和Gibbs自由能。
[Abstract]:Hydrophobic ionic liquids 1 ethyl methyl ether 3 methyl imidazole bistrifluoromethyl sulfonimide ionic liquids and 1 ethyl ethyl ether 3 methyl imidazole bis 3 fluoromethyl sulfonic imide ionic liquids were synthesized in this paper.The 1H NMR spectra of the two ether-based imidazole ionic liquids and their corresponding intermediates, 1-ethylmethyl ether -3-methyl imidazolium bromide and 1-ethyl ethyl ether -3-methyl imidazolium bromide, were analyzed and characterized by 1H NMR and 13C NMR.The intermediate and the final product were determined to be the target ionic liquids.In the past studies, the enthalpy of vaporization of ionic liquids was determined by TGA method.The innovation of this paper is to use TG IR to measure the infrared spectra of the volatile gases in each constant temperature region under the same experimental conditions as the TG experiment.By comparing the infrared spectra obtained at different temperatures, it is proved that the ionic liquid does not decompose, and the decomposition temperature of the ionic liquid is inferred.Then using the TGA analysis method, through the constant temperature range of the loss of weight,The enthalpy of vaporization for measuring the mean temperature of ionic liquids. Verevkin et al. In his paper, it is proposed that the heat tolerance of ionic liquids in gaseous state and liquid state can be calculated on the basis of statistical thermodynamics.By calculating the gas and liquid heat tolerance of ionic liquids, the enthalpy of vaporization of ionic liquids calculated by TGA is converted to 298K, and the enthalpy of vaporization of other temperatures is estimated.In addition, the polarity 未 _ 渭 of [MOEmim] [NTf_2] and [EOMmim] [NTf_2] ionic liquids have been determined.At the same time, the enthalpy of vaporization, entropy of vaporization and Gibbs free energy of two kinds of ether-based imidazole ionic liquids at different temperatures were estimated respectively.
【学位授予单位】：辽宁大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O645.1

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