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A kind of composite forward osmosis membrane and preparation method thereof

A technology of forward osmosis membrane and liquid membrane, which is applied in the field of polymer membrane separation, can solve the problems of low doping amount, lower recycled water quality, lower water flux, etc., and achieve high salt rejection rate, long service life, high water flux effect

Inactive Publication Date: 2018-06-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent can increase the water flux of the forward osmosis membrane by doping nanoparticles, the nanoparticles are easy to agglomerate in the support layer, which not only cannot improve the water flux, but will reduce the water flux
Secondly, nanoparticles are inorganic compounds, which are poorly compatible with organic forward osmosis membranes. Not only is the doping amount low, but nanoparticles can increase the water flux of forward osmosis membranes while reducing the rejection rate of forward osmosis membranes, thereby reducing quality of recycled water
Finally, as far as the current production level is concerned, the price of nanoparticles is relatively expensive, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Add 40g of a mixture of polysulfone and polysulfoneamide with a mass ratio of 1:3 to 60g of N,N-dimethylacetamide, stir until the polymer dissolves, and then add 0.1g of polysulfone with a particle size of 40μm to the polymer solution. The left and right macroporous chelating resin nanoparticles are ultrasonically dispersed and sealed and stirred for 30 minutes to obtain the casting solution.

[0042] (2) Coating the casting solution on a flat, dry and clean glass plate, the thickness of the casting solution is 200 μm, the ambient temperature during coating is 5° C., and the humidity is 60%. Immediately after the coating was completed, the casting liquid and the glass plate were immersed in deionized water, and the polymer support layer was obtained after 12.2 minutes. Wherein, the surface of the membrane directly in contact with the deionized water is the upper surface of the polymer support layer, and the surface of the membrane directly in contact with the glass ...

Embodiment 2

[0046] The preparation method of doped ion exchange resin forward osmosis membrane.

[0047] (1) Add 15.8 g of polyacrylonitrile to 84.2 g of dioxane and N,N-dimethylformamide with a mass ratio of 2:1, add 1.3 g of polyacrylonitrile to the polymer solution after stirring until the polymer dissolves g The mixed nanoparticles of gel cationic resin and macroporous chelating resin with a particle size of about 8 μm, wherein the mass ratio of gel cationic resin and macroporous chelating resin is 5:2, ultrasonically dispersed and sealed After stirring for 30 minutes, the casting solution was obtained.

[0048] (2) Coating the casting solution on a flat, dry and clean glass plate, the thickness of the casting solution is 150 μm, the ambient temperature during coating is 11.4° C., and the humidity is 20%. Immediately after the coating was completed, the casting solution and the glass plate were immersed in deionized water, and the polymer support layer was obtained after 17.8 minutes...

Embodiment 3

[0052] The preparation method of doped ion exchange resin forward osmosis membrane.

[0053] (1) Add 30.2g of polyethersulfone to 69.8g of dioxane, stir until the polymer dissolves, and then add 6.5g of macroporous anion resin and macroporous chelating resin with a particle size of about 12 μm to the polymer solution Nanoparticles, wherein the mass ratio of the macroporous anion resin and the macroporous chelating resin is 1:2, ultrasonically dispersed and sealed and stirred for 30min to obtain the casting solution.

[0054] (2) Coating the casting solution on a flat, dry and clean glass plate, the thickness of the casting solution is 100 μm, the ambient temperature during coating is 53° C., and the humidity is 72%. Immediately after the coating was completed, the casting solution and the glass plate were immersed in deionized water, and the polymer support layer was obtained after 13 minutes. Wherein, the surface of the membrane directly in contact with the deionized water i...

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Abstract

The present invention relates to a composite forward osmosis membrane and a preparation method thereof. The composite forward osmosis membrane comprises an ion exchange resin doped polymer support layer and a polyamide active layer compounded on the polymer support layer surface, wherein a mass ratio of the ion exchange resin to the polymer in the polymer support layer is (0.1-25):(5-40). The preparation method comprises: doping ion exchange resin micro-particles in a polymer solution, preparing a composite forward osmosis membrane support layer containing the ion exchange resin by using a non-solvent induction phase separation method, and compounding an active layer adopting polyamine and poly acyl chloride on the surface of the composite forward osmosis membrane support layer containing the ion exchange resin by using an interfacial polymerization method so as to prepare the composite forward osmosis membrane, wherein the prepared composite forward osmosis membrane can be adopted as the osmosis membrane for seawater desalination and other processes. Compared with the method in the prior art, the method of the present invention has advantages of economy, high efficiency, high water flux, high salt trapping rate, and the like.

Description

technical field [0001] The invention relates to the technical field of polymer membrane separation, in particular to a composite forward osmosis membrane and a preparation method thereof. Background technique [0002] Water is one of the precious resources that human beings depend on for survival. China's total fresh water resources are 2.8 trillion m 3 , accounting for 6% of global water resources, but per capita fresh water resources are only 2200m 3 , which is only 1 / 4 of the world's average level, and is one of the 13 countries with poor water resources per capita in the world. my country has a coastline of 18,000 km and a sea area of ​​about 4.7 million km 2 In addition to being a rich potential fresh water resource, seawater also contains a large amount of biomass resources and mineral resources. In addition, a large amount of industrial wastewater and domestic sewage are produced every year. Although multi-effect heat pump evaporation technology, nanofiltration-r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D67/00
Inventor 曹贵平左浩然吕慧
Owner EAST CHINA UNIV OF SCI & TECH
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