Comparison of anionic membranes used to concentrate nitric acid to beyond the azeotropic mixture

摘要

The electrolysis of concentrated nitric acid solutions was carried out in an electrochemical cell with parallel plates (FM01-LCICI). An anionic membrnae that permits the migration of nitrate ions under the influence of an electricla field separated the anodic and cathodic compartments. The currnt efficiency for the transported nitrate ions was evaluated for several membranes, at a constant current. All the membranes allowed the trasport of nitrate ions at different current efficiencies, following the increase in acid concentration in the anodic compartment.