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Cation rectification system for fine screening of special cations and application of cation rectification system

A rectification system and refined sieve technology, applied in the field of cationic rectification, can solve the problems that the characteristics of continuous operation cannot be effectively reflected, limit the separation efficiency of target ions, and unsatisfactory screening performance, so as to reduce the requirements of its own characteristics, Reduce the cost of preparation and research and development, and improve the effect of selectivity

Active Publication Date: 2021-11-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the selective electrodialysis process, the separation performance of special ions still depends on the screening characteristics of the functional membrane itself, and the unsatisfactory screening performance of the functional membrane also limits the separation efficiency of target ions.
[0006] Similar to traditional special ion separation processes, such as ion exchange, solvent extraction, ion sieve adsorption, etc., the industry needs to achieve the target screening of special ions through the coupling and integration of multiple selective electrodialysis units. At this time, selective electrodialysis itself The characteristics of continuous operation cannot be effectively reflected

Method used

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  • Cation rectification system for fine screening of special cations and application of cation rectification system
  • Cation rectification system for fine screening of special cations and application of cation rectification system
  • Cation rectification system for fine screening of special cations and application of cation rectification system

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Embodiment 1

[0057] This embodiment utilizes the above-mentioned cation rectification system to process the + , Mg 2+ with Cl - For the mixed material liquid of ions, the cation rectification system adopted is a four-stage cation rectification system, and the number of cation rectification units is 1. The first-stage cation rectification chamber communicates with the first-stage anion retention chamber, and the circulation flow is driven by a solution-driven pump; the second-stage cation rectification chamber communicates with the second-stage anion retention chamber, and the circulation flow is driven by a solution-driven pump; the third stage The first-stage cation rectification chamber communicates with the third-stage anion retention chamber, and the circulating flow is driven by a solution-driven pump; the fourth-stage cation rectification chamber communicates with the fourth-stage anion retention chamber, and the circulation flow is driven by a solution-driven pump; the anode chambe...

Embodiment 2

[0061] This embodiment utilizes the above-mentioned cation rectification system to process the + , Mg 2+ with Cl - For the mixed material liquid of ions, the cation rectification system adopted is a three-stage cation rectification system, and the number of cation rectification units is 1; the first-stage cation rectification chamber communicates with the first-stage anion retention chamber, and is driven by a solution-driven pump Circulating flow; the second-stage cationic rectification chamber communicates with the second-stage anion retention chamber, and the circulation flow is driven by a solution-driven pump; the third-stage cationic rectification chamber communicates with the third-stage anion retention chamber, and the circulation flow is driven by a solution-driven pump ; The anode chamber communicates with the cathode chamber, and the circulation flow is driven by a solution-driven pump. The three-stage cation rectification system consists of 3 one-multivalent cati...

Embodiment 3

[0065] This embodiment utilizes the above-mentioned cation rectification system to process the + , Mg 2+ with Cl - For the mixed material liquid of ions, the cation rectification system adopted is a two-stage cation rectification system, and the number of cation rectification units is 1; the first-stage cation rectification chamber communicates with the first-stage anion retention chamber, and is driven by a solution-driven pump Circulating flow; the second-stage cation rectification chamber communicates with the second-stage anion retention chamber, and the circulation flow is driven by a solution-driven pump; the anode chamber communicates with the cathode chamber, and the circulation flow is driven by a solution-driven pump. The two-stage cation rectification system consists of 2 one-multivalent cation selective membranes and 4 anion exchange membranes (two of which are used as end-capping diaphragms); 2 ruthenium-iridium electrodes are placed at both ends of the cation re...

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Abstract

The invention discloses a cation rectification system for fine screening of special cations and application of the cation rectification system. The system is formed by sequentially laminating one or more anion exchange membranes and special cation selective membranes according to the principle of 'same kind and same side', and then adding a runner separation net and a sealing gasket, and different from an arrangement mode of functional films in a traditional electrodialysis membrane stack, different types of functional films in the system are not alternately arranged. The cation rectification system disclosed by the invention adopts the special diaphragm with specific screening capacity for certain cation, and through layer-by-layer superposition, step-by-step screening of the cation, step-by-step blocking of impurity cation and selective stage amplification of the special cation are realized, so that the fine screening efficiency of the special cation is greatly improved, and the constraint condition that the selectivity of target cations is determined by the characteristics of a single cation special screening diaphragm in the traditional electrodialysis process is broken through.

Description

technical field [0001] The invention belongs to the field of electric-driven membrane separation, and in particular relates to a cation rectification technology and a production method for fine screening of special cations. Background technique [0002] Special ion separation is an important chemical separation technology, which occupies an important position in the fields of chemical wastewater treatment, seawater desalination, lithium extraction from salt lakes, and biomedicine. Traditionally, separation technologies suitable for special ion screening include ion exchange, solvent extraction, ion sieve adsorption, membrane separation, multi-step crystallization, chromatography and other technical processes. These processes can achieve the separation of target ions very well, but subject to the technical barriers of the process itself, these traditional special ion separation technologies still have various problems. [0003] Ion exchange process, solvent extraction, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/48B01D61/46C02F1/469
CPCB01D61/48B01D61/485B01D61/46C02F1/4695Y02A20/124
Inventor 徐铜文蒋晨啸陈秉伦
Owner UNIV OF SCI & TECH OF CHINA
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