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本文利用气相色谱法测定了对二氯苯在不同组成的水溶液体系中的活度系数,其中包括二组份与三组份共溶剂体系、表面活性剂-水体系与NaCl-水体系。实验结果表明:对二氯苯在二组份和三组份共溶剂体系中的活度系数的对数值与各组份的体积分数之间有线性加和关系;表面活性剂在达到临界胶束浓度以上时,可显著降低对二氯苯在水中的活度系数;对二氯苯在NaCl水溶液中的活度系数与NaCI的含量之间成正比关系。作者还利用UNIFAC法估算了对二氯苯在各种共溶剂体系中的活度系数,所得估算值与测定值相接近。
In this paper, the activity coefficients of p-dichlorobenzene in aqueous solutions of different compositions were determined by gas chromatography, including two component and three component cosolvent system, surfactant-water system and NaCl-water system. The experimental results show that there is a linear additive relationship between the logarithm of the activity coefficient of p-dichlorobenzene in the two-component and three-component cosolvent system and the volume fraction of each component. When the surfactant reaches the critical micelle Concentration can significantly reduce the activity coefficient of p-dichlorobenzene in water. The activity coefficient of p-dichlorobenzene in NaCl aqueous solution is directly proportional to the content of NaCI. The authors also used the UNIFAC method to estimate the activity coefficient of p-dichlorobenzene in various co-solvent systems, and the resulting estimates approximate the measured values.