Study of the Thermochemical Effect on the Transport and Structural Characteristics of Heterogeneous Ion-Exchange Membranes by Combining the Cell Model and the Fine-Porous Membrane Model

For the first time, based on joint application of fine-porous and cell models, a theoretical analysis changing transport structural characteristics heterogeneous polymeric ion-exchange membranes (IEMs) MK-40, MA-40, MA-41 after exposure to elevated temperatures in water aggressive media (H2SO4 NaOH solutions), as well long-term processing electrodialyzers various types, was carried out. The studied are composites polymers with polyethylene nylon reinforcing mesh. external influences provoke aging IEMs deterioration their characteristics. properties quantitatively described using five physicochemical parameters: counterion diffusion equilibrium distribution coefficients membrane, characteristic exchange capacity, which depends microporosity ion-exchanger particles, macroscopic porosity at known capacity IEMs. Calculations parameters were performed according specially developed fitting technique experimental concentration dependences integral permeability specific electrical conductivity, model analogs. This made it possible identify evaluate changes membrane micro- macrostructure examine process artificial IEM polymer material due abovementioned impacts.