Polyamide compound positive osmotic membrane for desalting wastewater

A forward osmosis membrane and polyamide technology, which is applied in the field of polyamide composite forward osmosis membranes for wastewater desalination, can solve the problems of reduced membrane strength, reduced separation layer thickness, reduced membrane permeation driving force, etc., so as to improve flux and flux The effect of increasing and reducing the degree of concentration polarization

Active Publication Date: 2018-06-08
苏州普希环保科技有限公司
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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

[0026] (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;

[0027] (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

[0036] (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;

[0037] (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 support layer;

[0038] (3) Dissolve 2wt% piperazine, 0.5wt% m-phenylenediamine, 0.5wt% sodium h...

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Abstract

The invention provides a polyamide compound positive osmotic membrane for desalting wastewater. By designing the polyamide compound positive osmotic membrane of an asymmetrical sandwiched structure: designing a high throughput polyamide separating layer and a high selectivity polyamide separating layer on two sides of a polysulfone supporting layer, separately and modifying the polysulfone surfacepolymerizing the high selectivity polyamide membrane on the interface with acrylic acid, the water throughput of the membrane is enhanced remarkably while a solute in raw material liquor does not enter the supporting layer. The water phase and oil phase monomer types of double-layered polyamide separating layers are selected to ensure the optimum membrane property.

Description

technical field [0001] The present application relates to a forward osmosis membrane, in particular to a polyamide composite 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 commer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D67/00
CPCB01D61/002B01D67/0006B01D69/10B01D69/12B01D71/56
Inventor 不公告发明人
Owner 苏州普希环保科技有限公司
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