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本工作利用计算机技术改进加热式凝固点测量装置的数据采集系统.改进后装置的混合物凝固点测量再现性为±0.001K;溶剂偏摩尔过量自由能测量再现性为±0.1J.mol~(-1).用凝固点降低法测量正丙胺、异丙胺、正丁胺,异丁胺、正戊胺、异戊胺、二乙胺、二异丙胺、三乙胺、三正丁胺分别与苯和对二甲苯构成二元混合物的溶剂活度系数.并使用一个包含物理相互作用的三参数连续缔合模型拟合实验数据.结果表明该模型能较好地刻画所研究的二元缔合混合物。
In this work, the data acquisition system of heating type solidification point measuring device was improved by using computer technology.The reproducibility of measurement of the freezing point of the mixture of the improved device was ± 0.001K.The repeatability of partial molar excess free energy of solvent was ± 0.1J · mol -1, N-butylamine, isobutylamine, n-pentylamine, isoamylamine, diethylamine, diisopropylamine, triethylamine, and tri-n-butylamine were measured respectively with benzene and p-bis Toluene constitutes the solvent activity coefficient of the binary mixture, and a three-parameter continuous association model with physical interaction is used to fit the experimental data.The results show that the model can describe the binary association mixture studied well.