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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

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Gas chromatographic thermodynamics on hydration processes of magnesium chloride with low water
CHEN Jian-jun(陈建军)1, CHEN Guan-cheng(陈关城)2
MA Pei-hua(马培华)2, BAO Ji-qing(保积庆)2
MA Yu-tao(马玉涛)1, CHEN Fen

1. College of Chemical Engineering, Qinghai University, 
Xining 810016, China;
2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,
 Xining 810008, China;
3. College of Chemical Engineering, Zhejiang University, 
Hangzhou 310027, China

Abstract:The dehydration and hydration processes of magnesium chloride hydrates were studied by means of frontal chromatography analysis, calorimetry, thermogravimetry and chemical analysis. The mathematical imitation for the adsorption isotherms of MgCl2·4H2O and MgCl2·2H2O at different temperatures indicates that Boltzmann Function is the ideal equation to describe those adsorption isotherms. Its adsorption heat is -13.06kJ/mol and -16.11kJ/mol, respectively. The adsorption equilibrium constants are also given. From the data obtained, there is a thermodynamical possibility to use partial dehydrated magnesium chloride hydrates as an absorbance to clean water vapor contained in bischophite dehydration equipment and let the protection gas HCl recycle in the fluid bed reaction system.

 

Key words:   magnesium chloride with low water; hydration heat; adsorption heat;differential scanning calorimetry; frontal chromatography

ISSN 1672-7029
CN 43-1423/U

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