Abstract
Publisher Summary This chapter discusses the limiting current density. When an electric current is passed through an ion exchange membrane, salt concentration on a desalting surface of the membrane is decreased due to concentration polarization, and reduced to zero at the limiting current density. The chapter derives the limiting current density equation introduced from the Nernst–Planck equation. The chapter discusses the dependence of limiting current density on electrolyte concentration and solution velocity of a solution. Concentration polarization occurs in a boundary layer formed on the desalting surface of an ion exchange membrane. The limiting current density is influenced by the solution flow in a desalting cell and ionic transport in the boundary layer. Limiting current density of an electrodialyzer is influenced by the distribution of solution flow in desalting cells. The chapter explains limiting current density of an electrodialyzer based on the limiting current density equation.
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