Abstract
Abstract The solvate KF.2HF is used in the molten state at 85°C for the production of F 2 . Water can be present in small quantities in the HF feed for this process and causes various complications such as corrosion of cell components and undesirable formation of F 2 O. The work described in this paper examines the effects of presence of H 2 O in KF.2HF melts in a comprehensive way over a wide range of mole fractions of water in the KF.2HF system. The conductivity, viscosity and Walden product are evaluated together with the determination of the density, to provide information on selective solvation, speciation and acidity in the system, as well as volumetric deviations of additivity in the thermodynamic properties of the system. Complete primary hydration of the ionic species appears to be reached at a mole fraction of water around 0.88, i.e. 7 water moles per mole of KF.2HF.
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