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Forward osmosis membrane for waste water desalination

A forward osmosis membrane and desalination technology, which is applied in semipermeable membrane separation, general water supply saving, osmosis/dialysis water/sewage treatment, etc., can solve the problems of reduced membrane strength, reduced separation layer thickness, and reduced driving force of membrane osmosis. To achieve the effect of increasing flux, reducing concentration polarization, and increasing flux

Active Publication Date: 2018-06-22
山西山安碧泉海绵城市科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The internal concentration polarization that occurs inside the support layer will reduce the membrane permeation driving force
In response to this problem, the method of reducing the thickness of the membrane is generally used to reduce the concentration polarization limit to the greatest extent, but the reduction of the thickness of the support layer will lead to the reduction of the strength of the membrane, and the reduction of the thickness of the separation layer will reduce the selectivity.
Some scholars have also proposed a symmetrical sandwich structure with a double skin layer. This method can reduce the degree of concentration polarization in the membrane by blocking the solute in the raw material solution from entering the support body. However, compared with the traditional forward osmosis membrane, it has an additional layer of separation layer so flux is not optimistic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve 20wt% polysulfone in N,N-dimethylacetamide, add 8wt% polyethylene glycol-400, heat and stir to dissolve completely, stand at room temperature for 24 hours to obtain cast Membrane solution, use a scraper to cast the casting solution onto a clean glass plate, let it stand in the air for 12 hours, quickly put it horizontally into the coagulation bath to gel for 1 hour, and then take it out to obtain the polysulfone support layer;

[0028] (2) Dissolve 2wt% piperazine, 0.5wt% m-phenylenediamine, 0.5wt% sodium hydroxide and 0.2wt% sodium dodecylsulfonate in deionized water, stir well to form the first water phase monomer; the pyromellitic acid chloride of 2wt%, the isophthaloyl dichloride of 2wt% are dissolved in the alkane solvent, form the first oil phase monomer after stirring evenly; % sodium hydroxide and 0.2wt% sodium dodecylsulfonate are dissolved in deionized water, and the second aqueous phase monomer is formed after stirring; a certain amount of trimes...

Embodiment 2

[0037] (1) Dissolve 20wt% polysulfone in N,N-dimethylacetamide, add 8wt% polyethylene glycol-400, heat and stir to dissolve completely, stand at room temperature for 24 hours to obtain cast Membrane solution, use a scraper to cast the casting solution onto a clean glass plate, let it stand in the air for 12 hours, quickly put it horizontally into the coagulation bath to gel for 1 hour, and then take it out to obtain the polysulfone support layer;

[0038] (2) Soak the side B of the polysulfone supporting layer in an acrylic acid solution containing copper sulfate (volume concentration: 0.5%) for 12 hours, blow nitrogen to remove oxygen, and irradiate with a cobalt source at room temperature until the absorbed dose is 25kGy. Extract in a Soxhlet extractor for 24 hours, remove the homopolymer on the surface of the polysulfone layer to obtain a surface hydrophilic modified polysulfone supporting layer;

[0039] (3) Dissolve 2wt% piperazine, 0.5wt% m-phenylenediamine, 0.5wt% sodiu...

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PUM

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Abstract

The invention provides a forward osmosis membrane for waste water desalination. The forward osmosis membrane of a sandwich structure with an asymmetric structure is designed, that is to say, a high throughput polyamide separation layer and a high selectivity polyamide separation layer are designed on the two sides of a polysulfone supporting layer respectively; on the basis that solute in a feed solution does not enter the supporting layer, the water flux of the membrane is significantly increased, water phase and oil phase monomer types of a double-layer polyamide separation layer are selected, and then it is guaranteed that the performance of the membrane is the best.

Description

technical field [0001] The present application relates to a forward osmosis membrane, in particular to a forward osmosis membrane for wastewater desalination. Background technique [0002] In August 2015, the World Resources Institute released the ranking of national water resource stress in 2040. It is expected that China will change from a country with medium water resource stress to a country with extremely high water resource stress. In order to cope with water resource pressure, countries around the world continue to strengthen the field of water treatment Various water treatment technologies have been developed successively, among which technologies such as reclaimed water reuse and seawater desalination are widely used. [0003] As an important supporting technology in the field of water treatment, membrane water treatment technologies such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO) have been commercialized after long-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D69/02B01D71/56B01D67/00B01D61/00C02F1/44
CPCB01D61/002B01D67/0002B01D69/02B01D69/105B01D69/125B01D71/56B01D2325/36C02F1/445Y02A20/131
Inventor 不公告发明人
Owner 山西山安碧泉海绵城市科技有限公司