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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 2    April 2007

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Thermodynamic properties of vapor complex Na2ZrCl6
LI Jun-li(李军丽)1, YU Jin(于 锦)1, 2,
YANG Dong-mei(杨冬梅)1, WANG Zhi-chang(王之昌)1

1. School of Sciences, Northeastern University, Shenyang 110004, China;
2. School of Sciences, Shenyang University of Technology, Shenyang 110023, China

Abstract:Thermodynamic studies were carried out for the vapor complex of sodium chloride with zirconium tetrachloride at 718−778 K and 0.5−2.5 kPa by using high temperature phase equilibrium-quenching experiments, taking closed Pyrex glass ampoules as the reaction containers. The results show that the sole predominant vapor complex is Na2ZrCl6 for the ZrCl4-NaCl system under the experimental conditions. The thermodynamic equilibrium constants and other thermodynamic functions of the reaction 2NaCl(s)+ZrCl4(g)=Na2ZrCl6(g) have been derived from the measurements. The results for the changes in enthalpy and entropy are ∆H0=(−70.1±1.5) kJ/mol and ∆S0=(−105.9±2.0) J/(mol∙K) in the temperature range.

 

Key words: ZrCl4; NaCl; Na2ZrCl6; vapor complex; phase equilibrium-quenching experiment

ISSN 1672-7029
CN 43-1423/U

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