Hydrometallurgical thermodynamics—III. Solvent effects on the activities and distribution of Hal−, Hal2 and HaL−3, in acetonitrile and propionitrile—water mixtures and applications to zinc—halogen batteries
✍ Scribed by P. Singh; B.W. Clare; C.C. Kenna; D.M. Muir
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 891 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The free energies of transfer of Ha-, Hal, and Hal; from water to acetonitrile-water and propionitrile-water mixtures are reported. Relative changes in AC, are discussed in terms of the neutral and electrostatic contributions to the solvation energy of these species and are compared with values of other complex anions and neutral species in protic and aprotic solvents. It is shown that solvent activity effects dominate the solvation energy of Hal,, Br; and I;, but hydrogen bonding effects dominate the solvation energy of Hal-and Cl; in aqueous acetonitrile. Nitrile-rich compositions strongly favour the formation of Bri . The solubility and the solvation characteristics of Br-, Br2 and Br; in water-saturated propionitrile are particularly useful in the development and understanding of the zinc-bromine redox battery.