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A method for preparing forward osmosis membrane with dual active layers reserved for drawing solute

A technology of forward osmosis membrane and double activity, which is applied in the field of membrane separation to achieve the effect of improving permeation flux

Active Publication Date: 2021-03-19
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of internal concentration polarization and membrane fouling, the present invention proposes to draw solutes in the reserved part of the support layer, while protecting the support layer from pollution, the absorbed solutes reserved in the support layer can effectively slow down the pollution of the support layer. The internal concentration polarization problem, thereby improving the flux of water

Method used

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  • A method for preparing forward osmosis membrane with dual active layers reserved for drawing solute
  • A method for preparing forward osmosis membrane with dual active layers reserved for drawing solute
  • A method for preparing forward osmosis membrane with dual active layers reserved for drawing solute

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preparation example Construction

[0041] The preparation method of the double active layer forward osmosis membrane reserved to draw solute is as follows:

[0042] Step A, washing the support layer with a pore diameter range of 50-1000nm and a porosity range of 20-98% with deionized water, and drying at 40-60°C for 1-60 minutes for later use;

[0043] Step B, dissolving the polyamine in deionized water to form a 1-7wt% polyamine solution;

[0044] Step C, adding the drawn solute to the polyamine solution obtained in step B, and the drawn solute concentration is 0-15 wt%, to prepare a mixed solution;

[0045] Step D, dissolving polybasic acid chlorides in n-hexane solution to form 0.01 to 1 wt% polybasic acid chlorides solution;

[0046] Step E, immersing the support layer in the solution obtained in step C for 1-30 minutes, so that the drawn solute remains in the support layer;

[0047] Step F, after taking it out, blot the residual solution on the surface of the support layer with filter paper, put it in a ...

Embodiment 1

[0050] (1) Rinse the base of the polyacrylonitrile fiber support layer with a pore size of 200 nm and a porosity of 90% with deionized water, and dry it for 10 minutes at 40° C. for later use;

[0051] (2) m-phenylenediamine is dissolved in deionized water to prepare a 2wt% m-phenylenediamine solution;

[0052] (3) adding sodium chloride to the 2wt% m-phenylenediamine solution, wherein the concentration of sodium chloride is 3wt%, to prepare a mixed solution;

[0053] (4) Dissolving trimesoyl chloride in n-hexane solution to form 0.2wt% trimesoyl chloride solution;

[0054](5) Soak the polyacrylonitrile fiber support layer in a solution containing 2wt% m-phenylenediamine (containing 3wt% NaCl) for 2min;

[0055] (6) Take out the polyacrylonitrile fiber supporting layer reserved to draw solute (NaCl), place it in the suction filtration device after blotting excess water with filter paper, make the monolayer soak in 0.2wt% trimesoyl chloride / n-hexane In alkane for 30s, the pol...

Embodiment 2

[0062] (1) Rinse the polyvinylidene fluoride support layer with a pore size of 100 nm and a porosity of 80% with deionized water, and dry it at 50° C. for later use;

[0063] (2) m-phenylenediamine is dissolved in deionized water to prepare a 3wt% m-phenylenediamine solution;

[0064] (3) adding sodium chloride to the 3wt% m-phenylenediamine solution, wherein the concentration of sodium chloride is 3.5wt%, to prepare a mixed solution;

[0065] (4) Dissolving trimesoyl chloride in n-hexane solution to form 0.2wt% trimesoyl chloride solution;

[0066] (5) Soak the polyvinylidene fluoride support layer in a solution containing 3wt% m-phenylenediamine (containing 3.5wt% NaCl) for 2 minutes;

[0067] (6) Take out the polyvinylidene fluoride support layer reserved for drawing solute (NaCl), blot the excess water with filter paper and place it in a suction filtration device, so that the single layer is soaked in 0.2wt% trimesoyl chloride / n-hexane In alkane for 30s, the polyamide ac...

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Abstract

The invention belongs to the field of membrane separation, and relates to a method for preparing a positive osmosis membrane with a reserved draw solute and double active layers. A porous membrane isused as a support layer, the active layers are prepared on the two sides of the support layer by an interfacial polymerization method, and a certain amount of draw solute is reserved in the support layer. The method for preparing the positive osmosis membrane with the reserved draw solute and the double active layers has higher flux than a conventional positive osmosis membrane with double activelayers, and more excellent anti-pollution performance in an AL-DS mode than a positive osmosis membrane with a single active layer. The method has the advantages that the preparation process is simpleand mass production can be easily achieved.

Description

technical field [0001] The invention belongs to the field of membrane separation and relates to a method for preparing a double active layer forward osmosis membrane. Background technique [0002] Nowadays, the deterioration of water quality and the shortage of water resources seriously affect the development of society. Membrane separation technology, as the most promising water treatment process in the 21st century, has been widely concerned and vigorously promoted in recent years because it does not need to add chemical reagents during the separation process and is easy to operate. The core of membrane separation technology is permeable membrane, which can be divided into microfiltration membrane (MF), ultrafiltration membrane (UF), nanofiltration membrane (NF), reverse osmosis membrane (RO) and forward osmosis membrane (FO) according to the pore size of the membrane. In the separation process, the forward osmosis membrane has the advantages of high separation efficiency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/06B01D67/00B01D69/02B01D69/10
CPCB01D67/0093B01D69/02B01D69/10B01D71/06B01D2325/30
Inventor 范新飞杨易孙梦涵冯国卿宋成文
Owner DALIAN MARITIME UNIVERSITY