离子液体[CnPy][HSO4]（n=2,3,4,5,6）的溶解焓研究

Solution enthalpy of ionic liquids [CnPy][HSO4]（n=2, 3, 4, 5, 6）

离子液体被称为21世纪环境友好溶剂,目前已成为多学科交叉的、最活跃的前沿研究课题之一。离子液体热力学数据是离子液体工业化的重要参数,也是工艺设计的依据,但是这些基础数据的缺乏,已限制了离子液体工业化的应用。为此,本文选择5种酸性离子液体N-烷基吡啶硫酸氢盐[CnPy][HSO4](n=2, 3, 4, 5, 6)为研究对象,首先进行合成并利用核磁共振氢谱(1H NMR)对其结构进行表征。然后,利用标准物质KCl标定过的SRC100型量热计,测定5种酸性离子液体[CnPy][HSO4](n=2, 3, 4, 5, 6)在不同浓度的的溶解焓,将测定的数据进行Pitzer方程拟合,得到了5种离子液体[CnPy][HSO4](n=2, 3, 4, 5, 6)的无限稀释摩尔溶解热和相应的Pitzer参数。

Ionic liquids are known as environmentally friendly solvents in the 21 st century, and they have become one kind of the most attractive soft materials in industry and academic communities. The thermodynamic data of ionic liquid are important parameters in the industry. It is crucial to obtain thermodynamic data for the application of the ILs in the industry and technological design. However, it has become a big obstacle to the industrialization of ionic liquids due to the lack of foundation data. In this article, five acidic pyridine-based ionic liquids [CnPy][HSO4](n=2, 3, 4, 5, 6) were synthesized by using the neutralization method and characterized by1 H NMR spectrum. The molar solution enthalpies were measured by using a SRC100 type calorimeter, which the calorimeter was verified by standard material KCl,solution enthalpies at different molalities of five kinds of ILs [CnPy][HSO4](n=2, 3, 4, 5, 6) were also determined, and the molar solution enthalpies at the infinite dilution and relative parameters were also obtained by application of Pitzer’s equation.