STABILITY OF HYDROGEN FLUORIDE UNDER WATER-GAS-REACTION CONDITIONS

The prime objective of the investigation was to prove the stability of hydrogen fl uoride under water-gas-reaction conditions. Calculations of the thermodynamically equilibrium composition of substances in the system of elements C–H–F–O were conducted, and it has been shown that with excess carbon and at a temperature of 1000 to 2000 K, the basic components of the mixture are carbon mono- and dioxide, hydrogen, methane, and hydrogen fl uoride, and carbon fl uorides and oxyfl uorides are absent. At a temperature above 1300 K, the thermodynamically equilibrium mixture consists of carbon monoxide, hydrogen, and hydrogen fl uoride. Calculation results have been confi rmed by laboratory experiments in which the only fl uorine-containing substance, i.e., hydrogen fl uoride, was found as part of the products of interaction of water and carbon in the presence of hydrogen fl uoride at a temperature of the order of 1500 K. The obtained results can become a basis for the technology of obtaining anhydrous hydrogen fl uoride from its aqueous solutions, including the azeotropic one, by high-temperature interaction of the steam and carbon at a temperature above 1000 K.
   
Author:  V. V. Kapustin, D. S. Pashkevich, V. A. Talalov,a D. A. Mukhortov,b Yu. I. Alekseev,c V. B. Petrov,b P. S. Kambur, M. P. Kambur, and O. N. Voznyuk
Keywords:  hydrogen fl uoride, carbon, water-gas reaction, heterogeneous combustion
Page:  889