ELECTRODIALYSIS-MEDIATED ELECTROLYTE SOLUTION DESALTING METHOD Russian patent published in 2005 - IPC

FIELD: electrochemical engineering.

SUBSTANCE: invention relates to electrochemical treatment of electrolyte solutions and electrodialysis methods, and, in particular, deionization methods. Method of electrodialysis desalting of an electrolyte solution comprises introducing solution into space between ion-selective membranes, applying direct current electric field, and conducting process to final concentration, while simultaneously measuring imposed process parameters, including current and voltage values, followed by calculating therefrom electric resistance of electrodialyzer and adjusting an electrical parameter. The latter is electric resistance of solution, for which part of dialyzate or concentrate is recycled to the process beginning. Direct current electric field originates from rectifier with external feeding voltametric characteristic.

EFFECT: prevented excessive current density above its allowed value, which would lead to concentration polarization and formation of sparingly soluble precipitates on the membrane surfaces; and increased operational reliability.

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