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系统研究了1,2-丙二醇+MCl(M=Na,K,Rb,Cs)+H2O三元体系在298.15和308.15K时的等温相平衡.采用硝酸汞滴定法测定了体系中无机盐的含量,采用安东帕RXA170折光率仪及DMA4500密度计测定了所有体系的折光率和密度数值.报道了1,2-丙二醇质量分数从0增加到0.9过程中饱和及不饱和三元溶液体系的等温溶解度、密度和折光率数据.实验结果发现,随着1,2-丙二醇的不断加入,饱和溶液的溶解度和密度均呈现出减小的趋势,而折光率的变化则呈现出相反的趋势.采用经验方程关联了不同醇水比条件下不饱和溶液的密度和折光率实验数据,获得了较为理想的拟合结果.本研究的开展充实了碱金属盐在混合溶剂中的热力学数据,为相关溶液化学研究奠定了基础.
The isothermal equilibrium of 1,2-propanediol + MCl (M = Na, K, Rb, Cs) + H2O ternary system at 298.15 and 308.15 K was systematically studied.The content of inorganic salts in the system was determined by mercury nitrate titration The refractive index and density of all the systems were measured by using Anton Paar RXA170 refractometer and DMA4500 densitometer.It is reported that the saturated and unsaturated ternary solution system isothermal when the mass fraction of 1,2-propanediol is increased from 0 to 0.9 Solubility, density and refractive index data.The experimental results showed that with the continuous addition of 1,2-propanediol, the solubility and density of saturated solution showed a decreasing trend, while the refractive index changes showed the opposite trend.Using The empirical equation is related to the experimental data of density and refractive index of unsaturated solution under different alcohol-water ratio conditions, and the ideal fitting result is obtained.The study carried out to enrich the thermodynamic data of alkali metal salt in mixed solvent, Chemical research laid the foundation.