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Electrodialysis separator and bipolar membrane electrodialysis device for producing organic acids

A technology of electrodialysis and separator, applied in the field of electrodialysis, can solve the problems of increased plate frame thickness and excessive fluid resistance, and achieve the effects of ensuring normal flow, reducing ion transfer resistance, and overcoming polarization problems

Inactive Publication Date: 2016-04-20
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides an electrodialysis separator, which overcomes the polarization problem when the ion concentration is low, and at the same time avoids the problems of excessive fluid resistance and increased thickness of the plate and frame caused by filling the ion exchange resin.

Method used

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  • Electrodialysis separator and bipolar membrane electrodialysis device for producing organic acids
  • Electrodialysis separator and bipolar membrane electrodialysis device for producing organic acids
  • Electrodialysis separator and bipolar membrane electrodialysis device for producing organic acids

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Embodiment 1

[0030] Example 1 Electrodialysis separator and bipolar membrane electrodialysis device

[0031] like figure 1 , figure 2 As shown, the electrodialysis separator of the present invention includes a plate frame 1 and a plate core separator 2 . The plate frame 1 has an inner cavity, and the plate core separator 2 is located in the inner cavity.

[0032] The upper and lower ends of the plate frame 1 are provided with rectangular liquid guiding holes. The liquid guiding holes are divided into two groups, one of which is an open liquid guiding hole 5 that communicates with the cavity of the plate frame through the water distribution channel 4, and the other group is. The closed liquid guiding holes 3 that are not communicated with the inner cavity of the plate frame, and the open liquid guiding holes 5 and the closed liquid guiding holes 3 are arranged at intervals.

[0033] The plate core separator 2 is formed by bonding ion-exchange fibers in a crisscross pattern, wherein the ...

Embodiment 2

[0037] This embodiment adopts the electrodialysis separator described in the above embodiment 1, wherein the plate frame material is EVA elastic thin plate, the thickness is 0.9mm, the plate frame size is 200×400mm, the thickness of the plate core separator is 0.9mm, and the plate frame is 0.9mm thick. The side length of the mesh in the heart separator is 2.0mm, the longitudinal ion exchange fiber and the long side of the plate frame are at a 45° angle (angle m), and the transverse ion exchange fiber is at a 135° angle (angle m) with the long side of the plate frame. n), the ion exchange fiber is cation exchange fiber, the material is sulfonated polysulfone, the diameter of each cation exchange fiber is 0.45mm, and the exchange capacity is 1.65mmol / g.

[0038]The bipolar membrane, cation exchange membrane (positive membrane), acid chamber separator and alkali chamber separator are formed into a membrane stack according to the installation sequence of the electrodialysis membran...

Embodiment 3

[0041] This embodiment adopts the electrodialysis separator described in the above-mentioned embodiment 1, wherein the plate frame material is EVA elastic thin plate, the thickness is 0.9mm, the plate frame size is 400×800mm, the thickness of the plate core separator is 0.9mm, and the plate frame is 0.9mm thick. The side length of the grid in the heart separator is 3.0mm, the longitudinal ion exchange fiber and the long side of the plate frame form an included angle of 45° (angle m), and the horizontal ion exchange fiber and the long side of the plate frame form an included angle of 135° (angle m). n), the ion exchange fiber is cation exchange fiber, the material is sulfonated polysulfone, the diameter of each cation exchange fiber is 0.45mm, and the exchange capacity is 1.65mmol / g.

[0042] The bipolar membrane, cation exchange membrane (positive membrane), acid chamber separator and alkali chamber separator are formed into a membrane stack according to the installation sequen...

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Abstract

The invention discloses an electrodialysis separation plate and a bipolar-membrane electrodialysis apparatus for producing organic acids. The electrodialysis separation plate comprises a plate frame with an inner cavity and a plate-center separation net arranged in the inner cavity; and the plate-center separation net is formed by bonding crisscross ion-exchange fiber, wherein longitudinal ion-exchange fiber and transverse ion-exchange fiber are not in a same plane. The bipolar-membrane electrodialysis apparatus comprises a membrane pile formed by multiple groups of membrane pairs, each membrane pair comprises a cation-exchange membrane, an acid-chamber separation plate, a bipolar membrane and an alkali-chamber separation plate which are arranged successively; the acid-chamber separation plate has the structure of the electrodialysis separation plate, and the ion-exchange fiber is cation-exchange fiber. The electrodialysis separation plate is simple in structure, is applied to fields of production of citric acids, amino acids and the like, and is capable of reducing resistance in an acid chamber, improving the transmission effect of ions, improving the current efficiency of an apparatus and reducing the operation cost.

Description

technical field [0001] The invention relates to the technical field of electrodialysis, in particular to an electrodialysis separator and a bipolar membrane electrodialysis device for producing organic acids. Background technique [0002] Bipolar membrane electrodialysis is a type of electrodialysis technology, which generates H through the dissociation of water under the action of a DC electric field. + and OH - , and use the selective permeability of ion exchange membranes to obtain acids and bases. [0003] Depending on the purpose of use, the bipolar membrane can be made into two-compartment, three-compartment and other forms. Bipolar membrane electrodialysis is the same as ordinary electrodialysis. When the ion concentration in the desalination chamber is relatively low, polarization will occur. At this time, the resistance of electrodialysis will increase, the current efficiency will be greatly reduced, and the desalination efficiency will also be reduced. . In ord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/50C02F1/469
Inventor 吴春金周慧婷杜春慧吴礼光
Owner ZHEJIANG GONGSHANG UNIVERSITY
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