[Bmim]BF_4离子液体在甲醇中的体积和黏度性质

Volumetric and viscosity properties of 1-butyl-3-methyl-imidazolium tetrafluoroborate ionic liquid in methanol

在298.15 K和常压下,测定了1-丁基-3-甲基咪唑四氟硼酸([Bmim]BF4)离子液体+甲醇体系的密度和黏度。由密度计算了体系的表观摩尔体积,并采用Redlich-Mayer方程关联了体系的表观摩尔体积与组成的关系,得到了[Bmim]BF4在甲醇中的标准偏摩尔体积。由Jones-Dole方程对体系的黏度随组成的变化进行了拟合,获得了[Bmim]BF4在甲醇中的黏度B系数。结果表明:[Bmim]BF4+甲醇体系的表观摩尔体积和黏度均随[Bmim]BF4浓度的增加而增加,[Bmim]BF4在甲醇中的标准偏摩尔体积和黏度B系数分别为155.72×10-6m3/mol和0.282 9。

Densities and viscosities of 1-butyl-3-methylimi- dazolium tetrafluoroborate ionic liquid （ [ Bmim ] BF4 ） with methanol were measured at 298.15 K and atmospheric pres- sure. Apparent molar volumes, V, of the above-mentioned mixture were determined from the experimental densities. Standard partial molar volume, V of [ Bmim] BF4 in methanol was estimated by the Redlich-Mayer equation. The achieved viscosities were used to calculate the viscosity B-coefficient of [ Bmim ] BF4 in methanol through Jones,Dole equation. The results indicate that the apparent molar volumes and viscosi- ties increase with increasing of ionic liquid concentration. Standard partial molar volume and viscosity B-coefficient of [ Bmim] BF4 in methanol is 155.72×10^-6 m^3 . mol^-1 and 0. 282 9 ,respectively.