脂肪酸钠盐对定组成甲醇溶液中烃类组分活度系数的影响(298.1K)

The effect of Salts of fatty Acids on the Activity Coefficient of Nonaqueous Component in Methyl alcohol Solutions ata Fixed Composition 298.1K

本文作者应用液上气相色谱法,在298.1K 下对定组成甲醇一苯、甲醇—正己烷和甲醇—环己烷溶液,测定平衡气相中苯、正己烷和环己烷的分压随脂肪酸钠盐浓度变化,由此求得溶质的盐效应活度系数.实验结果表明,不同碳链大小的脂肪酸根离子的盐效应作用差别较大,根据溶液中离子间静电作用、分子构型及分子间色散力作用等对实验结果进行了分析和讨论.

This paper reports the effect of three salts,sodium acetate(C_2), sodium butyrate(C_4) and sodium caproate(C_6),on the activity coefficient of three methyl alcohol solutions,namely benzene,hexane and cyciohexane,ata fixed compo- sition in the methyl alcohol solution at 298.1K. The method adopted is to measure the variation of partial pressure of solute in an equilibrium vapor phase with the concentration of the salt at fixed composition of methyl alcohol by gas chromatography,thus to calculate the salt effect activity coefficient of benzene,hexane and cyclohexane in the methyl alcohol solution.The mechanism of salt effect changes dramatically as the number of carbon in the cha- in of anion increases. Finally,the experimental result have been analyzed and discussed according to the electrostatic interaction,the molecular constitution and the chromatic force in the mixed solution.