On dependence of effective separation factor on degree of distillation

By using the example of the experimental data of the distillation of Pb-Sb (with Pb as the base) it is shown that the efficiency of distillation purification can be determined not only by the dependence of the effective separation factor on the degree of distillation, in the known distillation equation, but also by two others parameters: the equilibrium separation factor and the Peclet number. (author)