Inorganic Chemicals Industry ›› 2021, Vol. 53 ›› Issue (12): 85-90.doi: 10.19964/j.issn.1006-4990.2021-0097

• Research & Development • Previous Articles     Next Articles

Measurement and correlation of solubility of magnesium chloride hexahydrate in six polyols

CHEN Yunfei1(),MAO Lili1,LIU Dan1,WANG Haizeng1,2()   

  1. 1. College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China
    2. Shandong Ocean Chemical Industry Scientific Research Institute
  • Received:2021-02-18 Online:2021-12-10 Published:2021-12-16
  • Contact: WANG Haizeng E-mail:15194290058@163.com;haizwang@ouc.edu.cn

Abstract:

Solubility of magnesium chloride hexahydrate is an important basic data in comprehensive utilization of magnesium salts.The static equilibrium method was used to determine the content of magnesium chloride hexahydrate in 1,2-propanedi-ol,1,3-propanediol,1,3-butanediol,diethylene glycol,triethylene glycol,and dipropylene glycol(278.15~328.15 K).The experimental results showed that the solubility of magnesium chloride hexahydrate in six polyols increased with the increase of temperature,among which the solubility of diethylene glycol was the largest,and the solubility of diethylene glycol changed more obviously with temperature than other polyols.The Apelblat equation,λh equation,Van′t Hoff equation and polynomial equation were used to correlate the solubility data,and the results were good.Among them,the fitting results of Apelblat equa-tion and polynomial equation were better than other equations.The Van′t Hoff equation was used to calculate the dissolution enthalpy,dissolution entropy and Gibbs free energy of the six systems.These results had important reference value for the separation and extraction of magnesium salts and the preparation of magnesium-based functional materials.

Key words: magnesium chloride hexahydrate, polyols, solubility, solubility model

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