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Double pole film with hyperbranched polymericcompound as the intermediate boundary layer and method of preparing the same

A technology of hyperbranched polymers and bipolar membranes, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of membrane performance degradation, cumbersome methods, and increased voltage drop, and achieve improved water dissociation performance , lower water dissociation voltage, simple preparation process

Inactive Publication Date: 2008-03-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of fixing metal ions and the method of preparing this bipolar membrane are cumbersome, and after a long period of use, the voltage drop on both sides of the membrane will increase, and the membrane performance will decrease.
Chinese Patent Application No. 200410044997.7 discloses a bipolar membrane obtained by using a dendritic polymer as a catalytic substance in the middle interface layer of the bipolar membrane. The performance of the bipolar membrane is stable, and it has the advantages of long service life and simple preparation process. The voltage drop on both sides is still not low enough, and the synthesis route of dendrimers is complicated and expensive, which limits its application range

Method used

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  • Double pole film with hyperbranched polymericcompound as the intermediate boundary layer and method of preparing the same
  • Double pole film with hyperbranched polymericcompound as the intermediate boundary layer and method of preparing the same
  • Double pole film with hyperbranched polymericcompound as the intermediate boundary layer and method of preparing the same

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Experimental program
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Effect test

Embodiment 1

[0017] First prepare the bipolar membrane with the hyperbranched polymer of the present invention as the intermediate interface layer, and the specific steps are as follows:

[0018] Boltorn _ H20 (manufactured by PerstorpGroup, brand H series products, including Boltorn _ H20, Boltorn _ H30, Boltorn _ H30, are the 2nd, 3rd, and 4th generation aliphatic hyperbranched polyesters with pentaerythritol as the core unit and 2,2-dimethylol propionic acid as the branching unit. Concrete structure is shown in following formula (I), formula (II), formula (III):

[0019]

[0020] Formula (I): Boltorn _ H20

[0021]

[0022] Formula (II): Boltorn _ H30

[0023]

[0024] Formula (III): Boltorn _ H40

[0025] First prepare the hyperbranched polymer Boltorn with a concentration of 5.0mg / mL _ H20 aqueous solution;

[0026] Soak the heterogeneous anion exchange membrane whose surface has been washed by 1M NaOH, 1M HCL and distilled water in the aqueous solution of the hype...

Embodiment 2

[0039] The preparation process of the bipolar membrane is the same as in Example 1, except that the temperature is kept constant at 40 degrees Celsius when the water is dissociated. The prepared bipolar membrane is at 40 degrees Celsius, 0.5mol / L Na 2 SO 4 In aqueous solution, the current density is 1200A / m 2 The voltage drop on both sides of the membrane under the same conditions is 3.8V, while under the same conditions without Boltorn _ The voltage drop on both sides of the bipolar membrane prepared by the anion exchange membrane soaked in H20 is 5.4V, that is, the adsorption concentration is 5.0mg / ml with pentaerythritol as the core unit and 2,2-dimethylolpropionic acid as the branched The second generation hyperbranched macromolecule Boltorn _ Compared with the bipolar membrane with H20 aqueous solution as the intermediate interface layer and the bipolar membrane without adding catalytic material interface layer, at 40 degrees Celsius, 0.5mol / LNa 2 SO 4 In aqueous sol...

Embodiment 3

[0041] The preparation process of bipolar membrane is similar to embodiment 1, just the Boltorn of the 2nd generation that concentration is 5.0mg / mL _ The H20 aqueous solution was replaced with the 3rd generation Boltorn at a concentration of 5 mg / mL _ H30 aqueous solution. The prepared bipolar membrane is at 25 degrees Celsius, 0.5mol / LNa 2 SO 4 In aqueous solution, the current density is 1200A / m 2 The voltage drop across the membrane under the film is 3.4V without Boltorn _ The voltage drop on both sides of the bipolar membrane prepared by the anion exchange membrane soaked in H30 is 5.3V, that is, with the adsorption concentration of 5mg / ml, pentaerythritol is the core unit and 2,2-dimethylolpropionic acid is the branch unit. The third generation hyperbranched macromolecule Boltorn _ Compared with the bipolar membrane with H30 aqueous solution as the intermediate interface layer and the bipolar membrane without adding catalytic material interface layer, at 25 degrees C...

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Abstract

The present invention is a bipolar membrane, which uses a hyperbranched polymer as a middle interface layer, and a manufacture method of the bipolar membrane. The bipolar membrane comprises an anion and cation exchange layer and the middle interface layer consisting of a section opposite to a membrane layer and a catalysis substance. The bipolar membrane is characterized in that the hyperbranched polymer of the catalysis substance uses pentaerythritol or trimethylol propane as a core and 2, 2-dimethylol propionic acid as a branched unit; moreover, an external layer end radicel is a modified hydroxide radicel or end hydroxide radicel and comprises amidocyanogen, carboxyl, hydrosulphonyl, carboxylate, phosphate, auaternary ammonium organic group, and sulfate or sulfite. The generation number of external layer end radicel is 2 to 7. The bipolar membrane of the present invention can ionize water under a low voltage so as to increase a reduction rate of voltage at two ends of the bipolar membrane from 10 percent in the case of a dentritic compound interface layer to 43 percent, and avoid loss of the catalysis substance in the use to keep the stability of the bipolar membrane performance. The hyperbranched polymer used is provided with the advantage that the synthesis is simple, the cost is low, the quality is stable and the polymer can be purchased trough commercial means.

Description

Technical field: [0001] The invention belongs to the technical field of bipolar membrane preparation, and in particular relates to a bipolar membrane with low water dissociation voltage and a preparation method thereof, which uses a hyperbranched polymer as an intermediate interface layer. Background technique: [0002] Bipolar membrane is a new type of ion exchange composite membrane, which usually includes an anion selective layer, a cation selective layer and an intermediate interface layer between these two membrane layers. Bipolar membranes can efficiently dissociate water into hydrogen ions and hydroxide ions under the action of a reverse bias electric field, thereby converting salts in aqueous solution into corresponding acids and bases. Electrodialysis based on bipolar membranes has the advantages of simplicity, high efficiency, energy saving, and cleanliness. It has broad applications in pollution control, resource recovery, and chemical production processes, especi...

Claims

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Application Information

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IPC IPC(8): B01D69/12C08J5/22
Inventor 徐铜文薛艳红杨伟华
Owner UNIV OF SCI & TECH OF CHINA
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