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Preparation method of diffusion dialysis cation exchange membrane

A cation exchange membrane and diffusion dialysis technology, applied in the field of ion exchange membrane preparation, can solve problems such as low swelling, achieve good film-forming performance, improve stability, and promote transportation.

Inactive Publication Date: 2014-10-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to make up for the above-mentioned deficiencies, and provides a method for preparing a cation exchange membrane. The technical problem to be solved is how to prepare a diffusion dialysis cation exchange membrane with high dialysis flux, good selectivity, good stability, and low swelling

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  • Preparation method of diffusion dialysis cation exchange membrane
  • Preparation method of diffusion dialysis cation exchange membrane
  • Preparation method of diffusion dialysis cation exchange membrane

Examples

Experimental program
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Embodiment 1

[0042] In this embodiment, the diffusion dialysis cation exchange membrane is prepared through the following steps:

[0043] 1. Recrystallize and purify the purchased sodium styrene sulfonate (SSNa) with ethanol / water (the volume ratio of ethanol and water is 9:1). Add 30ml of methanol-water solution (volume ratio 1:1) into the polymerization tube. Continue to add 0.430ml α-ethyl bromoisobutyrate (EBiB), 0.0034g copper bromide (CuBr 2 ), 0.156mlN,N,N',N',N″-pentamethyldiethylenetriamine (PMDETA), 2gSSNa, the molar ratio of the above four substances is 20:1:50:700, mix until the solid is completely Dissolved and the liquid was clarified and homogeneous, nitrogen gas was introduced for 1 h, and oxygen was removed by bubbling.

[0044] The polymerization tube was frozen with liquid nitrogen at -198°C until all the reactants in the tube changed from liquid to solid, and then vacuumed with a vacuum pump until the vacuum degree was 0.06 Pa and kept for 3 min. Infuse nitrogen agai...

Embodiment 2

[0059]The preparation method of the cation exchange membrane of this embodiment is the same as that of Example 1, except that 1gPSSNa is mixed with 20ml 5% PVA aqueous solution, that is, the mass ratio of PSSNa and PVA is 1:1; 1.0608g (3-aminopropyl ) Triethoxysilane (A-1100) was used as a silane coupling agent instead of 1.0g TEOS to cross-link with a homogeneous solution of polyelectrolyte and PVA; the cross-linking reaction time was shortened to 2h to obtain a cation exchange membrane.

[0060] For the convenience of comparison, a similar process was adopted, but formaldehyde crosslinking was used instead of silane coupling agent crosslinking to obtain reference film 2. Wherein, the formaldehyde crosslinking process is similar to the corresponding process of the reference film 1 in Example 1.

[0061] Water content and hot water swelling performance tests were carried out on the cation exchange membrane obtained in this example. The water content test showed that the water...

Embodiment 3

[0064] The preparation method of this example is the same as that of Example 1, except that 1.1345g of γ-(2,3-glycidyloxy)propyltrimethoxysilane (KH560) is used instead of 1g of TEOS as the silane coupling agent; the crosslinking time is shortened to 20min to obtain a cation exchange membrane. The membranes were subjected to infrared, water content, thermal analysis, ion exchange capacity and DD tests.

[0065] Figure 4 The infrared spectrogram of the cation-exchange membrane prepared for this embodiment, among the figure, ~3450cm -1 It is the characteristic vibration peak of -OH on PVA or -Si-OH, ~2940cm -1 for -CH 2 Absorption peak, ~1650cm -1 is-CH 3 ,-CH 2 -, = stretching vibration peak of CH- group, ~1120cm -1 It is the stretching vibration peak of -Si-O-Si-. ~1040cm -1 And ~ 1201cm -1 yes-so 3 The stretching vibration peak of Na. This indicates that PVA was successfully blended with PSSNa, and silane KH560 also played an effective cross-linking role.

[006...

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Abstract

The invention discloses a preparation method of a diffusion dialysis cation exchange membrane. The preparation method of the diffusion dialysis cation exchange membrane is characterized by comprising the following steps: carrying out ARGET-ATRP (activated regenerated catalyst electron transfer-atom transfer radical polymerization) on a monomer containing double bonds and -SO3Na group to obtain polyelectrolyte, blending the polyelectrolyte and a membrane base body polyving akohol, crosslinking with a silane coupling agent to obtain a film painting liquid, drying after film painting, and carrying out thermal treatment to obtain a cation exchange membrane. The method provided by the invention endows the film painting liquid with performances of good membrane formation performance, excellent membrane flexibility, tear resistance and the like by utilizing the toughness and intensity of polyving akohol; the membrane is endowed with high dialysis flux to hydrated ions, such as OH<-1>, by utilizing a great amount of hydroxide radicals (-OH) and high hydrophilia which are contained in PVA (polyving akohol); the ion exchange group is introduced into the membrane by adding polyelectrolyte, and the membrane is endowed with high osmolality of membrane and ion selection and separation characteristic; silane is used again for crosslinking so as to overcome the defect of high swelling degree of the membrane.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membrane preparation, in particular to a method for preparing a diffusion dialysis cation exchange membrane by polyelectrolyte preparation, blending and silane crosslinking. Background technique [0002] A large amount of waste acid and alkali will be produced in the process of modern industrial production. If it is discharged directly without proper treatment, not only the useful resources in the waste liquid will not be effectively utilized, but it will also cause serious damage to the environment, water sources, and organisms. Applying ionic membrane to diffusion dialysis (DD) can effectively separate and recycle waste acid and alkali. The DD process only uses the concentration difference of the feed liquid on both sides of the membrane as the driving force, and has the characteristics of continuous, simple, efficient, economical and environmentally friendly. DD treatment of waste acid re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/28B01D71/38B01D67/00B01D61/24
Inventor 吴翠明刘露薛帅王帅吴永会
Owner HEFEI UNIV OF TECH
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