A MATHEMATICAL DESCRIPTION OF MASS TRANSFER AND A TECHNIQUE OF CALCULATING THE LOCAL MASS-TRANSFER COEFFICIENTS IN THE INTER-MEMBRANE CHANNEL OF BAROMEMBRANE ROLL ELEMENTS

摘要

A mathematical description of the electrobaromembrane process using an approach based on the Nernst-Planck and Poisson-Boltzmann equations is presented. The hydrodynamic conditions in the in-termembrane channel is taken into account by a dimensionless equation based on the Reynolds criterion and a technique is presented for determining electrobaromembrane separation of solutions, taking into account the kinetics of mass transfer and the hydrodynamics of the flow of a solution in an intermem-brane channel. Through the use of the technique the local mass-transfer coefficients along the length of the channel of the membrane module may be determined. The technique may also be used to predict and develop laboratory, pilot and industrial electromembrane instruments and plants.