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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, so as to reduce the water dissociation voltage , improved water dissociation performance, and simple preparation process

Inactive Publication Date: 2010-09-15
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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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] Bundle H20 (manufactured by PerstorpGroup, brand H series products, including H20, H30, 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]

[0021]

[0022] Prepare the hyperbranched polymer with a concentration of 5.0mg / mL H20 aqueous solution;

[0023] 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 hyperbranched polymer, take it out after 24 hours, and dry it naturally at room temperature, so that the hyperbranched macromolecules are adsorbed on the anion. On ...

Embodiment 2

[0036] 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 film under the same conditions is 3.8V, while under the same conditions without 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 second generation hyperbranched macromolecule 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 solution, the current density...

Embodiment 3

[0038] The preparation process of the bipolar membrane is similar to that of Example 1, except that the concentration of the second generation of 5.0mg / mL The H20 aqueous solution was replaced with the third generation of the concentration of 5mg / 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 3.4V without 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 of hyperbranched macromolecules 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 Celsius, 0.5mol / L Na 2 ...

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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 hyperbranchedpolymer 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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Patent Type & Authority Patents(China)
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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