LiCl-MgCl2-H2O及其子体系多温下体积性质研究

Volumetric Properties of the Binary Systems(LiCl-H2O and MgCl2-H2O) and the Ternary System(LiCl-MgCl2-H2O)from 273.15 K to 308.15 K 

中文关键词:  密度  体积特性  Pitzer 模型  氯化锂  氯化镁

英文关键词:Density  Volumetric properties  Pitzer model  Lithium chloride  Magnesium chloride

中文摘要:

      用高精度振动管密度仪测定二元系统(LiCl-H₂O 和 MgCl₂-H₂O)和三元系统(LiCl-MgCl₂-H₂O)在273.15 至 308.15 K下溶液密度。采用VFT方程关联了LiCl和MgCl₂溶液密度与温度、摩尔浓度关系。利用Young理想混合规则,根据二元体积性质计算计算了三元系统溶液密度。采用Pitzer离子相互模型拟合了LiCl-MgCl₂-H₂O,得到Pitzer单盐参数(β(0)VMX,β(1)VMX,and CVMX,MX=LiCl 和 MgCl₂)和混合离子相互作用参数(θVLi,Mg、ψVLi,Mg,Cl)。在本工作中确定了三元体系在恒定离子强度下的混合体积 (ΔV_m)。

英文摘要:

      The densities for two binary systems (LiCl-H₂O and MgCl₂-H₂O)and the ternary system (LiCl-MgCl₂-H₂O) over the temperature range from 273.15 to 308.15 K at intervals of 5 K were experimentally determined with a high precision vibrating-tube densitometer. Based on the Vogel-Fulcher-Tamman (VFT) equation,the coefficients of the correlation equation for densities of LiCl(aq) and MgCl₂(aq) against temperature and molality were parameterized. The ideal mixing rule of Young was successfully applied to correlate the densities of the ternary system based on relevant binary solution properties. On the basis of volumetric property data of the binary and ternary systems,the Pitzer single-salt parameters (β(0)VMX,β(1)VMX,and CV MX,MX=LiCl and MgCl₂) and mixing ion-interaction parameters (θV Li,Mg,ψ VLi,Mg,Cl) were parameterized according to Pitzer ion-interaction theory of single salt and mixture electrolytes,respectively. The volumes of mixing(ΔVm) at constant ionic strength were determined for the ternary system in the present work.