摘要
用等压法研究了298.15 K下L iC l-L i2B4O7-H2O体系在不同L iB4O7质量摩尔浓度时的等压平衡浓度,水活度;计算了L iC l和L i2B4O7混合盐溶液的渗透系数等热力学性质.用298.15 K下的实验数据对P itzer离子相互作用模型进行了参数化研究,拟合求取了298.15 K下P itzer离子相互作用参数,用获得的参数计算了L iC l和L i2B4O7在L iC l-L i2B4O7-H2O体系中的活度系数.P itzer模型计算的渗透系数值与实验结果一致.
The isopiestic molalities and the water activities were measured at 298.15 K for the LiCl-Li2B4O7-H2O system by isopiestic method, and the vapor pressures and the osmotic coefficients were obtained from the measurements. The experimental data were represented by different forms of the ion interaction model based on the primary Pitzer model of osmotic coefficient. The Pitzer ion interaction parameters were evaluated from recent measurements by using multiple regression and iterative method. The activity coefficients of LiCl and Li2B4O7 for the system LiCl-Li2B4O7-H2O were calculated by the ion interaction model parameterized at low concentrations. The data of osmotic coefficients measured are in reasonable agreements with those calculated by using the model. These studies are useful to improve the thermodynamic model for salt lake brine systems containing lithium and borates.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第4期735-738,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20373084)资助
