Computer modeling of column apparatuses: 2. Multistep modeling approach

A new approach for computer modeling of the mass transfer processes in column apparatuses, on the base of the convection-diffusion type of models in the physical approximations of the mechanics of continua, is proposed. In the cases of a nonstationary chemical adsorption in gas-solid systems, the presence of mobile (gas) and immobile (solid) phases in the conditions of long-time processes, leads to the nonstationary process in the immobile phase and stationary process in the mobile phase, practically. As a result, different coordinate systems must be used in the gas and solid phase models. A combination of a multistep algorithms and MATLAB are used for the solutions of the equations set in different coordinate systems. As a result, it is shown that the experimental data, obtained from the column with real radius and small height, are useful for parameters identifications in the average concentration-type models.