ELECTRODIALYSIS DESALINATION METHOD OF ELECTROLYTE SOLUTION Russian patent published in 2020 - IPC C02F1/469 

FIELD: technological processes.

SUBSTANCE: invention can be used in electrochemical treatment of solutions. One performs successive desalination of electrolyte solution in desalination stages, each of which includes circulation circuit of diluate 2 and circulation circuit of concentrate 4, connected to at least one electrodialysis module. Controlled supply of electrolyte to flow circuit of diluate 1 is performed, which is in-series connected to circulation circuits of diluate 2 of desalination stage, starting from the first and to last through at least one electrodialysis module. Electrolyte is fed into the electrodialysis module of the first demineralisation step and its desalination is carried out; then, the obtained diluate is directed through the circulation circuits of the diluate and the flow circuit of the diluate into the electrodialysis modules of the subsequent demineralisation stages. Concentrate 21 is fed into concentrate flow circuit 3, which is in series connected to circulation circuits of concentrate 4 of desalination stages, starting from last to first through series-connected electrodialysis modules, and passes in opposite direction relative to direction of flow circuit of diluate. Electrical resistance of the concentrate is determined at the output of the first desalination stage, and electric resistance of the diluate is determined at the output of the last step and the supply of electrolyte and concentrate is corrected based on the obtained results.

EFFECT: disclosed invention ensures the desalination process uninterrupted operation, reduced power consumption during electrodialysis desalination of the solution, increased speed of the process, its reliability and efficiency, as well as increased degree of equipment use.

6 cl, 4 dwg