  Abstract. The present work considers a change in the momentum under the
transfer of a solution through the interface. It is shown that pressure related
to the partial volumes of components arises in a solution under diffusion. As a
result, the distribution of the concentration of solution components differs
qualitatively from the known solutions. In contrast to the description of
one-dimensional interphase mass transfer using the convective diffusion
problem, the proposed model provides the stationary exponential distribution of
components in both phases. The model describes component segregation by the
interface, observed in the experiments.
