Classification of model cascades for separation of multicomponent isotope mixtures

As far as we know, it is the first attempt to build the classification of the currently existing models of molecular-selective mass transfer in cascades for isotope separation in the stationary mode of their operation. In papers devoted to this subject, such cascades are often called as "model" ones. It is shown that for the case of symmetric separation any of such a "model" cascade can be represented as a special case of a cascade with constant separation factors. There are established interrelationships of the "model" cascades, both with each other and with the symmetrical countercurrent cascades feasible in practice.