高等学校化学学报 ›› 2006, Vol. 27 ›› Issue (4): 735.

• 研究论文 • 上一篇    下一篇

LiCl-Li2B4O7-H2O体系在298.15 K下热力学性质的等压研究

杨吉民1,2,    姚燕1,   张爱云1,  宋彭生1   

  1. 1. 中国科学院青海盐湖研究所,   西宁  810008;    2. 临沂师范学院化学系,        临沂  276005
  • 收稿日期:2005-01-10 出版日期:2006-04-10 发布日期:2006-04-10
  • 通讯作者: 姚燕(1945年出生), 女, 研究员, 博士生导师, 主要从事溶液化学研究. E-mail: yaoy@isl.ac.cn
  • 基金资助:

    国家自然科学基金(批准号: 20373084)资助

Isopiestic Studies on Thermodynamic Properties for LiCl-Li2B4O7-H2O System at  298.15 K

YANG  Ji-Min 1,2 ,  YAO  Yan1*,  ZHANG  Ai-Yun1,  SONG Peng-Sheng1   

  1. 1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,  Xining 810008, China;
    2. Department of Chemistry,  Linyi Normal University,  Linyi  276005,  China)
  • Received:2005-01-10 Online:2006-04-10 Published:2006-04-10
  • Contact: YAO Yan, E-mail: yaoy@isl.ac.cn

摘要:

用等压法研究了298.15 K下LiCl-Li2B4O7-H2O体系在不同LiB4O7质量摩尔浓度时的等压平衡浓度,  水活度; 计算了LiCl和Li2B4O7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Pitzer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Pitzer离子相互作用参数, 用获得的参数计算了LiCl和Li2B4O7在LiCl-Li2B4O7-H2O体系中的活度系数. Pitzer模型计算的渗透系数值与实验结果一致.

关键词: LiCl-Li2B4O7-H2O体系; 等压法; 渗透系数; Pitzer模型

Abstract:

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-H2O  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.

Key words: LiCl-Li2B4O7-H2O  system;  Isopiestic method; Osmotic coefficient;  Pitzer model

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