Electrochemical separating device and use method thereof

Abstract

An electrochemical separation device includes a pair of electrodes and at least a dilution spacer between the electrodes. The dilution spacer provides a dilute compartment having an inlet for a solution to be diluted to enter the dilute compartment, an outlet for a diluted solution to exit the dilute compartment, and a dilute flow path connecting the inlet and outlet. The dilute flow path has a width gradually decreased substantially along a flow direction from the inlet to the outlet, or in some cases, the dilute flow path includes longitudinal sections and turning sections that join the longitudinal sections to form a winding series flow path, wherein the longitudinal sections have a width gradually decreased along a flow direction from the inlet to the outlet.

Description

Technical field [0001] The invention relates to an electrochemical separation device and a method of using the electrochemical separation device. Background technique [0002] Electrodialysis, reverse electrode electrodialysis, supercapacitor desalination and other electrochemical processes are widely used in separation processes such as solution desalination and desalination. In the electrochemical separation process, taking electrodialysis as an example, when the material (such as the aqueous solution to be treated) flows in the concentration chamber and the weak chamber, the solute ions in the solution undergo directional migration under the action of a DC electric field. There is a stagnant layer between the ion exchange membrane and the solution. When the working current increases to a certain level, the ions in the solution cannot be quickly supplemented to the surface of the membrane, making the ion concentration on the membrane surface tend to zero, causing the stagnant l...

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Problems solved by technology

However, due to the limitation of the working current, it is difficult to obtain a high desalination rate by a single electrodialysis process. Therefore, the current electrodialysis process often uses multi-stage membrane stacks in series for desalination and desalination treatment. For example, in order to achieve a desalination

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