ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Reactions of potassium tetrafluoroborate in molten alkali chlorides

V. Daněk, I. Votava, and K. Matiašovský

Institute of Inorganic Chemistry, Slovak Academy of Sciences, 809 34 Bratislava

Abstract: The reactions of KBF₄ in molten alkali chlorides, LiCl, NaCl, and KCl, were studied by the cryoscopic method. In molten LiCl, KBF₄ decomps. with formation of gaseous BCl₃. In molten NaCl, the exchange reaction between KBF4 and Cl- with formation of KBCl₄ proceeds at small concns. of KBF₄ only. No reaction occurs in molten KCl. The exptl. results were confirmed by thermodn. calcns. On the basis of the exptl. detd. depression of the temp. of primary crystn. in the system NaCl-KBF4, the equil. const. of the reaction 4NaCl + KBF₄⇄   4NaF + KBCl₄ and the Gibbs free energy of liq. KBCl₄ at 1073 K were calcd.

Full paper in Portable Document Format: 303a377.pdf

Chemical Papers 30 (3) 377–383 (1976)