Electrodialysis module and electrodialysis system

Abstract

An electrodialysis module includes at least one base unit. The base unit includes a working tank, a first ion-exchange membrane, a second ion-exchange membrane, at least one first electrode, and at least two second electrodes. The first ion-exchange membrane and the second ion-exchange membrane are located in the working tank. The first ion-exchange membrane and the second ion-exchange membrane together divide the working tank into two electrode compartments and a desalination compartment therebetween. The at least one first electrode is disposed in the desalination compartment. The at least two second electrodes are disposed in each of the electrode compartments, respectively, in which the at least two second electrodes and the at least one first electrode have different polarities. The electrodialysis module and the electrodialysis system disclosed by the invention have the characteristics of low energy consumption, wide adaptability, high recovery rate and simple program flow, and can effectively separate salts in the solution to purify the acid or alkali in the solution. .

Description

technical field [0001] The invention relates to the field of electrodialysis, in particular to an electrodialysis module and an electrodialysis system. Background technique [0002] Organic acids and liquid caustic soda (sodium hydroxide in liquid state) are widely used in chemical raw materials, medicine, food and feed, and there is a general demand for increased concentration in various fields. However, whether it is the concentration method of the organic acid back-stage product, such as evaporative crystallization, solvent extraction or calcium salt method, or the current concentration method of liquid caustic soda, such as the use of evaporative concentration method, it all has energy consumption and output. The disadvantages of low cost, complicated procedures or high impurities make it impossible to reduce the cost. In addition, although there is a two-stage electrodialysis technology combined with bipolar membranes to recover organic acids in the current research, t...

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Problems solved by technology

However, whether it is the concentration method of the organic acid back-stage product, such as evaporative crystallization, solvent extraction or calcium salt method, or the current concentration method of liquid caustic soda, such as the use of evaporative concentration method, it all has energy consumption and output. Low cost, complex procedures or high impurities make it impossible to reduce the cost

In addition, although there is a two-stage electrodialysis technology combined with bipolar membranes in the current research to recover organic acids, the use of bipolar membranes is not only costly but also requires less dialysis, it is not suitable for use in various industries at this stage

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