Li2SO4-EtOH-H2O体系25℃气-液-固平衡和液相物理化学性质的研究

研究Li_2SO_4-EtOH-H_2O体系25 ℃气液平衡及液相的粘度和密度。湿渣法确定平衡固相在整个浓度范围内均为Li_2SO_4·H_2O。用经验公式ln(y/y_0)=K_1x+K_2x~2+K_2x~3对体系的溶解度和密度数据进行关联。硫酸锂加入到液相后由于盐离子静电作用对乙醇-水体系粘度的影响。按Jaques的假二元体系模型, 用WILSON, NRTL方程关联气液平衡数据。

Studies on the Vapor-Liquid Equilibrium and Properties of Physical Chemistry in Liquid Phase for the Ternary System Li2SO4-EtOH-H2O at 25℃

In this paper, the solubilities, viscosities, densities and vapor-liquid equilibrium were studied for the ternary system Li_2SO_4-EtOH-H_2O at 25 ℃. The equilibrium solid phases, which were determined by wet-residue method, were all Li_2SO_4·H_2O in the whole concentration. The solubilities and densities were correlated by using empirical formula In(y/y_0) =K_1x+K_2x~2+K_3x~3 and the good results were obtained. After lithium sulfate was added to the solvent, it was showed that the figure of viscosity, compared with that for the pure solvent system of ethanolwater, make a change because of the action of static electricity of salt ions on the solvent. According to Jaques' pseudobinary model, NRTL and WILSON equations were used to correlate the vapor-liquid equilibrium data of the system. It was obtained that ethanol is a salting out component and water is a salting in component.