硫酸铯/乙醇双水相体系的相平衡

Phase Equilibrium of the Cs_2SO_4-C_2H_5OH-H_2O Aqueous Two-Phase System

采用自制的相平衡研究装置,测定了硫酸铯/乙醇双水相体系在0、10、20和40℃四个温度下的等温平衡溶解度,并且获得了醇相溶液和水相溶液的折光率数据,发现温度对该体系的液-液和固-液相平衡均没有显著影响。利用“湿渣结线法”确定出四个温度下平衡固相均为无水盐,同时给出了该体系的完整相图,在相图中观察到五个相区,为该体系的进一步应用研究提供了参考数据。

The solubilities of the Cs2SO4-C2H5OH-H2O aqueous two-phase system at 0, 10, 20 and 40 degreesC had been studied using microequipment for solubility determination. It was found that the effect of temperature on the phase equilibrium was insignificant within the investigated range. There appeared two phases, alcoholic phase and water phase in the liquid phase. The solubilities of Cs2SO4 in water, C2H5OH and mixed solvent had been determined and the refractive index of the liquid phases was also determined. The phase diagram indicated that C2H5OH was salted out by Cs2SO4 from this system and the equilibrium solid phase is Cs2SO4. The complete phase diagram of the system were also presented in the article, in which we found five zones.