用连续稀释膨胀计测量液体混合物的过量体积

本文利用改进的倾斜式连续稀释膨胀计,在常压和298.15K 下测定了苯与环己烷以及苯与正丁醇,异丁醇,仲丁醇二元混合液的摩尔过量体积.实验结果用R—K 方程拟合,苯与环己烷过量体积的平均标准偏差为0.0009cm~3·mol.~(-1),此结果与文献值符合较好.对于苯和三种丁醇同分异构体所组成的二元体系,其摩尔过量体积在全浓度范围内均为正值,V~E 随着醇中羟基位置和烷基结构的变化,其顺序为:正丁醇<异丁醇<仲丁醇.从分子间的相互作用,对实验结果进行了定性解释.

EXCESS MOLAR VOLUMES OF LIQUID MIXTURES WITH A CONTINUOUS DILUTION DILATOMETER

At 298.15K and atmosphere pressure,excess molar volumes of Benzene with cyclohexane,n-butanol,iso-butanol or sec-btutanol have been measured with an improved continuous-dilution dilatometer.Experimental results were fitted to R-K equation.Standard deviations and the least-squares parameters for benzene+cyclohexane are compared with available results in literatures.It is found that excess molar volumes are positive over the en- tire range of x for benzene+n-butanol,iso-butanol,Sec-butanol,V~E values increase with the variety of hydroxyl position in the alkanol.The experimental results are qualitatively disscus-sed in brief from the interaction between molecules.