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Selective bipolar membrane electrodialysis system and application thereof

A bipolar membrane electrodialysis and selectivity technology, applied in the field of electrodialysis technology, can solve problems such as complicated process operation, achieve the effects of simplifying the process, improving economy, and reducing energy consumption of electrode reactions

Inactive Publication Date: 2017-05-10
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The whole process involves the coupling between selective electrodialysis and bipolar membrane electrodialysis. Compared with the traditional causticization method, ion exchange membrane method, extraction method and electrolysis method to make acid and alkali from brine, in To a certain extent, the cost is reduced and the environmental pollution of the process is reduced, but the process operation is still very complicated

Method used

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  • Selective bipolar membrane electrodialysis system and application thereof
  • Selective bipolar membrane electrodialysis system and application thereof
  • Selective bipolar membrane electrodialysis system and application thereof

Examples

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Embodiment 1

[0042] This embodiment utilizes the above figure 2 The shown selective bipolar membrane electrodialysis system processes the sea crystal solution, the raw material used is the sea crystal solution, and the sea crystal concentration is 70g / L; the specific processing steps are as follows:

[0043] The electrodialysis membrane stack in the electrodialysis system used is composed of a bipolar membrane, a multivalent cation selective permeable membrane and a multivalent anion selective permeable membrane, which are laminated alternately in sequence, and then added with flow channel partitions and sealing gaskets. A total of three bipolar membranes, two one multivalent cation selective permeable membranes, two one multivalent anion selective permeable membranes are used, and two "alkali chambers - material liquid chambers - acid chamber" repeating unit. The bipolar membrane forms an alkali chamber with an adjacent multivalent cation selective permeable membrane, and forms an acid ...

Embodiment 2

[0048] This embodiment utilizes the electrodialysis system identical to embodiment 1, and sea crystal solution is processed, and used raw material is the solution of sea crystal, and sea crystal concentration is 35g / L; Concrete processing steps are as follows:

[0049] Add the sea crystal solution to the feed liquid storage tank, use the feed liquid to drive the pump to make the sea crystal solution circulate between the feed liquid chamber and the feed liquid storage tank; add 0.1mol / L hydrochloric acid solution to the acid liquid storage tank, use the acid The liquid drives the pump to make the acid circulate between the acid room and the acid storage tank; add 0.1mol / L sodium hydroxide solution to the lye storage tank, and use the lye to drive the pump to make the lye flow between the lye room and the lye Circulating flow between the storage tanks; add 3% sodium sulfate solution into the electrode solution storage tank, and use the electrode solution to drive the pump to mak...

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Abstract

The invention discloses a selective bipolar membrane electrodialysis system and application thereof. The selective bipolar membrane electrodialysis system comprises an electrodialysis membrane pile, a positive electrode plate and a negative electrode plate, wherein the positive electrode plate and the negative electrode plate are fixed at the two sides of the electrodialysis membrane pile through clamping plates; the electrodialysis membrane pile is formed by sequentially and alternately laminating several kinds of functional membranes and adding a flow passage separation net and a sealing gasket; the functional membranes comprise a bipolar membrane and a multiple valence ion selective passing membrane; an anion exchange layer of the bipolar membrane faces the positive electrode plate; the cation exchange layer faces the negative electrode plate. The selective bipolar membrane electrodialysis system provided by the invention has the advantages that the bipolar membrane electrodialysis and the selective electrodialysis are combined in the same device; when the system is used for salt-containing material desalting and acid-base production, the bipolar membrane electrodialysis and the selective electrodialysis are merged into one operation; the flow process is simplified; the operation quantity is reduced; the electrode reaction energy consumption is reduced; the production efficiency is improved.

Description

technical field [0001] The invention relates to a selective bipolar membrane electrodialysis technology, more specifically an electrodialysis technology using a multivalent ion selective permeable membrane combined with a bipolar membrane. Background technique [0002] Electrodialysis is a new type of mass transfer separation technology. Using ion exchange membranes with different properties, electrodialysis can be used in different fields, such as water treatment, environmental protection, biopharmaceuticals, and desalination and concentration of industrial materials. Due to the different components of the materials to be treated, and the different treatment goals for the materials in the process, the types of ion exchange membranes can be subdivided into many types, and the common ion exchange membranes are anion / cation exchange membranes. Anion exchange membranes are generally made of positively charged polymers through phase inversion, and have a dense structure that all...

Claims

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Application Information

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IPC IPC(8): C02F1/469
CPCC02F1/4693Y02A20/124Y02W10/37
Inventor 徐铜文蒋晨啸陈秉伦汪耀明
Owner UNIV OF SCI & TECH OF CHINA
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