25℃时硫酸锂-乙醇-水三元体系的相平衡研究  

Study on phase equilibrium of lithium sulfate-ethanol-water ternary dystem at 25 ℃

作　　者：陆宏志[1] 陆继俊[1] 杨吉民[1] 

机构地区：[1]山东临沂师范学院化学化工学院,山东临沂276005

出　　处：《无机盐工业》2009年第9期21-23,共3页Inorganic Chemicals Industry

基　　金：山东省自然基金(Y2007B47)

摘　　要：采用等温溶解平衡法研究了25℃时硫酸锂-乙醇-水三元体系的平衡溶解度及饱和溶液的折光率和密度,并且绘制了25℃时硫酸锂-乙醇-水三元体系相图。用多元线性回归程序对溶液的折光率、密度和硫酸锂的溶解度与液相中乙醇含量之间的关系进行关联,并且计算了乙醇对硫酸锂溶液的盐析率。实验中体系没有产生分层现象,固体为一水合硫酸锂。给出的硫酸锂-乙醇-水三元体系的平衡数据,不仅为溶液化学提供了基础热力学数据,而且为硫酸锂的分离纯化和萃取提供了依据。Equilibrium solubility of lithium sulfate - ethanol - water （ Li2 SO4 -- C2 H5 OH - H2O ）） ternary system and refractive index-anddensity of saturated solution have been investigated by isothermal equilibrium method at 25℃. Ternary phase diagrams of Li2SO4 -C2 H5 OH- H20 ternary system at 25℃ were plotted. Relations between the saturated solubility of Li2 S04 ,refractive index and density of the saturated solution and the alcohol content in liquid phase were evaluated by multiple linear regression analysis algorithm. Salting-out rate of Li2 SO4 solution against ethanol was calculated. No demixing phenomena were observed and a hydrated salt Li2 SO4 · H2 0 was found. A series of phase equilibrium data of Li2 S04 - C2 H5 OH - H2 0 ternary system were given out,which not only provided basic thermodynamic data for solution chemistry,but also provided foundation for purification and extraction of Li2SO4.

关 键 词：硫酸锂 乙醇 三元体系 相平衡 溶解度 

分 类 号：TQ131.11[化学工程—无机化工]