A continuous electronically controlled ion separation device and process

Abstract

The invention discloses a continuous electric-control ionic separation device and a continuous electric-control ionic separation process. The continuous electric-control ionic separation device comprises a central columnar membrane electrode and an external circular counter electrode, wherein the central columnar membrane electrode has an electric-control ionic exchange function; a raw material liquid and a regenerated liquid are respectively and continuously input into a raw material liquid chamber and a regenerated liquid chamber which are uniformly distributed between the central columnar membrane electrode and the external circular counter electrode; different potentials are applied to the central columnar membrane electrode and the external circular counter electrode respectively and rotation of the electrodes is controlled, so that target ions in the raw material liquid can be adsorbed by the membrane electrode, and desorption and regeneration of the membrane electrode in the regeneration liquid can be continuously completed, so that efficient synchronous continuous electric-control separation and recycling of the target ions in a solution can be achieved. Liquid paths in the continuous electric-control ionic separation device do not need to be switched, the structure is simple, and the operation is convenient; ions in the solution can be directly adsorbed / desorbed on the surface of the membrane electrode, the ion transmission speed is fast, and the ion separation efficiency is high; the membrane electrode can be operated continuously.

Description

technical field [0001] The invention relates to a continuous electronically controlled ion separation device and process, in particular to an electrochemically controlled ion exchange device and process for continuously selectively separating and recovering target ions in a solution, and belongs to the technical field of ion separation and recovery. Background technique [0002] The raw materials and intermediate products in the industrial production process usually contain various metal and non-metal ion impurities. These trace impurity ions will corrode the reactor and induce side reactions, thereby reducing the reaction efficiency and product quality. Especially in recent years, the discharge of wastewater containing non-biodegradable toxic metals or non-metal ions has been increasing, and the resulting problems of drinking water and food safety are not uncommon. On the other hand, toxic heavy metal ions such as rare earths and precious metals contained in industrial wast...

AI Technical Summary

Problems solved by technology

Chinese patent CN102583664A discloses a diaphragm reactor composed of an ion exchange membrane and a group of ESIX membrane electrodes. By alternately applying redox potential to the membrane electrodes and combining with an external liquid supply system, continuous electronically controlled separation and recovery of single ions can be realized. However, the operation process of the system is complicated and requires additional circuits and liquid circuit switching systems, resulting in high operating costs.

In this separation process, the ions need to pass through the diaphragm electrode, the transfer resistance of the ions is large, the separation efficiency is low, and it is inconvenient to apply an external electric field.

Chinese patent CN104587835A discloses a sleeve-type reactor. By controlling the opening and closing of the concentric double-layer sleeve inert electrode, combined with an external power supply to alternately regulate the oxidation / reduction potential of the membrane electrode, the continuous separation and recovery of anions and cations can be realized. However, this process requires additional circuits and liquid circuit switching systems. At the same time, the common chamber of the treatment liquid and the regeneration liquid will cause mutual interference and reduce the separation efficiency.

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