苯和正己烷在盐甲醉溶液中的活度系数(298 K)

在芳烃或烷烃的甲醇溶液中加入电解质可导致溶性的改变。不同的盐及盐浓度对两者溶度的变化影响不同。有些盐能显著的扩大芳烃或烷经在甲醇中的溶性差异。前人曾提出过利用盐改性的甲醇溶液作芳烃抽提溶剂的设想。本文工作是测定恒温下定组成的苯-甲醇和正己烷-甲醇溶液中苯和正己烷的活度系数随不同盐浓度的变化。所选用的盐是LiCl、NaBr和NH_4Br,它们的甲醇溶液有较大的浓度变化范

ACTIVITY COEFFICIENT OF BENZENE AND n-HEXANE IN METHANOL SALT SOLUTIONS AT 298 K

The activity coefficients of benzene and n-hexane in solutions of LiCl, NaBr and NH_4Br in methanol were measured at 298.15±0.06 K. Thecomposition of binary mixture of benzene-methanol and n-hexane-methanol was constant at each experi- mental run. Benzene or n-hexane content in equilibrium gas phase was expressed by gas chromatography and the value of activity coefficient of the component was determined by the ratio of heights of chromatographic peaks. Experimental results show that the salting out effect of benzene in methanol is smaller than that of n-hexane and the salting in factor of n-hexane by lithium ion is smaller than that of benzene, thus the mechanism of salt modified solvent was discussed preliminarily.