离子液体BMIMPF_6与乙酸二元混合液的密度和体积性质  

Density and Excess Volumes of Mixture for BMIMPF_6 + Acetic Acid

作　　者：林明穗[1] 王仁章[1] 苏志忠[1] 韩凤至[1] 

机构地区：[1]三明学院化学与生物工程系,福建三明365004

出　　处：《三明学院学报》2008年第4期406-412,共7页Journal of Sanming University

基　　金：福建省自然科学基金(2007J064)

摘　　要：利用测得常压下298.15～318.15 K温度全浓度范围的混合液密度,计算BMIMPF6和乙酸溶液的超额摩尔体积和无限稀释超额偏摩尔体积,两者均为负值,并表现出良好的一致性。用Redlich-Kister方程拟合混合液的超额摩尔体积与组分浓度关系,最大标准偏差低于0.005 cm3·mol-1.利用Flory统计理论讨论了二元混合系体积随温度的变化规律,结果表明理论分析与实验结果具有较高的吻合度;用离子液体中离子与有机分子间存在着离子-偶极作用和结构效应解释了实验现象。The density of the mixtures formed by 1-butyl-3-methylimidazolium hexafluorophosphate BMIMPF6 with Acetic acid has been determined over the full range of compositions at the temperature range from 298.15 to 318.15 K and at atmospheric pressure. From these data, excess molar volumes and limiting excess partial molar volumes were estimated and were negative; the agreement between them is well. The Vm^E values have been fitted to the Redlich-Kister equation, The maximum standard deviations are lower than 0.005cm^3·mol^-1. Temperature dependence of volumetric properties was analyzed in light of Flory statistical mechanical theory in the mixture. The results indicate that the agreement between the theoretical and experimental results is satisfactory. The results have been interpreted in terms of ion - dipole interactions and structural factors of the ionic liquid and organic molecular liquid.

关 键 词：离子液体 密度 摩尔体积 BMIMPF6 乙酸 

分 类 号：TQ013.1[化学工程]