CJCU

Chem. J. Chinese Universities ›› 2006, Vol. 27 ›› Issue (4): 735.

• Articles • Previous Articles     Next Articles

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

PDF (PC)

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

CLC Number: 

TrendMD: