On Parameters of Evaporation Refining

Abstract

The previously presented theory of evaporation refining which takes into account the difference in the vapor pressure of the components and the diffusion of impurities (but not other possible factors) is analyzed. The complexity of the theory is noted: to calculate the refining efficiency depending on the yield at a given temperature, a large number of parameters (nine) of the substance and material are required: molar mass M, density ρ, melting point T_m, equilibrium separation factor β₀, vapor pressure of the main component p, the impurity diffusion activation energy in the refined substance Q, the impurity diffusion coefficient D_m at temperature T_m and the material size factor X. The conceptual character of the theory under consideration is noted due to the lack of knowledge of most of these parameters and the neglect of all process factors.