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Date of Publication:2019-01-01

Journal:Journal of Chemical Engineering of Chinese Universities

Affiliation of Author(s):能源与动力学院

Volume:33

Issue:3

Page Number:533-539

ISSN No.:1003-9015

Key Words:"conductivity; solution; temperature; ion; additive"

CN No.:33-1141/TQ

Abstract:In order to develop suitable working fluids for a closed type heat-power conversion system with reverse electrodialysis method, three strong electrolytes (LiCl, LiBr and LiI) were selected as the solutes and three solvents with low latent heat of vaporization (ethanol, isopropanol and 2,2,2-trifluoroethanol) were used as solvents to study the conductivities of solutions by using a conductivity measurement apparatus. Effects of solute, solvent, temperature, and additives on solution conductivity were studied by experimental data correlation (modified GuassAmp equation) and solution thermodynamical/electrochemical analysis. The results show that the LiX-ethanol and LiX-isopropanol systems have the maximal and minimum conductivities, respectively. The LiI-solvent system possesses the maximal conductivity and the LiCl-solvent system has the minimum conductivity when using the same solvent. Conductivities were also found to be improved by increasing the solution temperature or adding additives with strong polarity (H_2O, N,N-dimethylacetamide). However, there is no obvious effect when adding either dichloromethane or N,N,-dimethylpropionamide into the solutions.

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