中文摘要
在离子液体的合成过程中,杂质离子的存在是影响产物纯度及合成效率的关键问题。尽管离子液体和杂质离子均属于盐类,但在多数情况下离子液体的阴阳离子分子量和体积较大,据此,本研究提出采用电渗析法实现对离子液体制备与纯化。其基本原理是:利用不同离子在离子交换膜中迁移速率的差异,控制适当的操作参数来达到连续去除离子液体合成过程中杂质离子(即卤化盐)的目的,从而促进离子液体的合成反应,有效提高离子液体的产率及纯度。本研究将深入考察离子液体在不同溶剂中的电离程度及溶剂化效应,以及离子液体体系中各离子在电场作用下的电离状况、扩散系数及迁移速率等,为利用电渗析制备与纯化离子液体奠定坚实的理论基础,并由此形成集离子液体制备与纯化为一体的新技术。本研究将有助于离子液体的产业化进程,具有重要的理论价值和广阔的应用前景。
英文摘要
In the synthesis process of ionic liquids, the impurity ions are the key factors to affect the purity and productive efficiency. Although both ionic liduid and impurity ions belongs to salt substances, in the most cases, the molecular weight and volume of ionic liquid are larger than those of impurity ions. Therefore,the eletrodialysis was used to prepare and purify the ionic liquid in this study. According to the migrating velocity differences of different ions, the impurity ions could be continuously removed by selecting the appropriate operational parameters. This would promote the synthesis reaction. The productivity and purity could subsequently be improved. The ionization degree,solvent effects, diffusion coefficient and migrating velocity shall be detailedly investigated. These experiments would provide the strong theoretical base for synthesis and preparation of ionic liquid. This study may facilitate the industrial process of ionic liquid, which is of scientific value and potential future application.
结题摘要
在离子液体的合成过程中,杂质离子的存在是影响产物纯度及合成效率的关键问题。尽管离子液体和杂质离子均属于盐类,但在多数情况下离子液体的阴阳离子分子量和体积较大,据此,本研究提出采用电渗析法实现对离子液体制备与纯化。其基本原理是:利用不同离子在离子交换膜中迁移速率的差异,控制适当的操作参数来达到连续去除离子液体合成过程中杂质离子(即卤化盐)的目的,从而促进离子液体的合成反应,有效提高离子液体的产率及纯度。本研究将深入考察离子液体在不同溶剂中的电离程度及溶剂化效应,以及离子液体体系中各离子在电场作用下的电离状况、扩散系数及迁移速率等,为利用电渗析制备与纯化离子液体奠定坚实的理论基础,并由此形成集离子液体制备与纯化为一体的新技术。本研究将有助于离子液体的产业化进程,具有重要的理论价值和广阔的应用前景。
