摘要
合成了1-丁基咪唑醋酸盐（[Bim]Ac）离子液体,通过1H-NMR、13C-NMR和IR对其结构进行了表征。在303.15K和常压下,采用U形振荡管密度计测定了[Bim]Ac＋甲醇、乙醇和正丙醇二元体系的密度,用乌氏黏度计测定了体系的黏度。由密度数据计算得到了体系的超额摩尔体积（VE）、表观摩尔体积（iVφ）、偏摩尔体积（m,iV）和超额偏摩尔体积（Em,iV）,由黏度数据获得了体系的混合黏度变化（？η）,并采用Redlich-Kister方程分别关联了VE、？η与组成的关系。结果表明：上述体系的VE在全浓度范围内均为负值,且在[Bim]Ac摩尔分数x1=0.3~0.4处出现极小值;Δη在全浓度范围也均为负值,在x1=0.4~0.5处出现极小值;[Bim]Ac＋醇体系VE或？η的极值大小为：[Bim]Ac＋甲醇〈[Bim]Ac＋乙醇〈[Bim]Ac＋正丙醇,表明[Bim]Ac与醇之间的相互作用随着醇极性的增加而增大。Redlich-Kister方程能较好地关联上述体系VE、？η与组成的关系。
1-Butylimidazolium acetate（[Bim]Ac） ionic liquid was synthesized, and the structure was characterized by 1H-NMR,13C-NMR, and IR spectroscopy. Density and viscosity of [Bim]Ac＋methanol, [Bim]Ac＋ethanol, and [Bim]Ac＋1-propanol binary mixtures were measured over an entire range of molar fraction at T=303.15 K under atmospheric pressure using a vibrating U-shaped sample tube densimeter and Ubbelohde Suspended-level viscometer, respectively. Excess molar volumes（VE）, apparent molar volumes（iVφ）, partial molar volumes（m,iV）, and excess partial molar volumes（Em,iV） of the studied systems were calculated with the density data. Viscosity deviations（Δη） of the studied systems were obtained from the viscosity data. VE and Δη were fitted by Redlich-Kister equation, respectively. The results show that the VE values of the three studied systems are negative over the entire composition range, and a minimum value is reached with mole fraction of [Bim]Ac x1=0.3~0.4. The Δη values of the above-mentioned systems are also negative over the entire composition range, and a minimum value is reached with x1=0.4~0.5. The VE or Δη values of the studied systems follow an order of [Bim]Ac＋methanol [Bim]Ac＋ethanol [Bim]Ac＋1-propanol, which indicates that the interaction between [Bim]Ac and alkanol increases with the increase of alkanol polarity. The VE and Δη values can be well fitted with Redlich-Kister equation.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2015年第5期1038-1044,共7页
Journal of Chemical Engineering of Chinese Universities
基金
浙江省自然科学基金(LY14B060002)
