NaAc在甲醇、乙二醇及三氟乙醇中的电导率实验

逆电渗析法热-电转换系统工作溶液的电导性和热可分离性是影响系统能量转换效率的关键性质。为研究系统匹配工作溶液,分别选用低汽化潜热的甲醇、乙二醇及三氟乙醇(TFE)为溶剂,乙酸钠(NaAc)为溶质,建立电导率测试装置,实测了变质量分数、变温度条件下的溶液电导率。结果显示:NaAc在甲醇中电导率最大,并且随溶液温度的升高而进一步增大。实测了NaAc在混合溶剂(95%甲醇+5%水和90%甲醇+10%水)中的电导率,得到三元体系电导率随着组元水含量的增加而明显增大的结果。最后,用改进高斯振幅方程关联了溶液电导率。

Electrical conductivity of solutions consist of NaAc and organic solvents (methanol, ethylene glycol and 2,2,2-trifluoroethanol)

Electrical conductivity and thermal separability are two important properties of the working solutions for a closed type heat-power conversation system with reverse electrodialysis (RED) method. In order to develop the suitable working solutions, methanol, ethylene glycol and 2,2,2-trifluoroethanol (TFE), with low latent heat of vaporization were selected as the solvents, and sodium acetate (NaAc) was chosen as the solute. And electrical conductivities of solutions consisted of the above solute and solvents were tested based on an electrical conductivity measurement rig under the varying concentration and temperature conditions. The results show that NaAc-methanol solution possesses the maximum electrical conductivity, which increases with the elevation of solution temperature. Besides, electrical conductivity of NaAc in mixture solvents (95% methanol+5% water and 90% methanol+10% water) were tested, and resulting that it is obviously enlarged with the increase of water fraction in these ternary solutions. Finally, modified Gauss amplitude equation was used to correlate the electrical conductivity of these solutions successfully.