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Method for preparing positive osmosis membrane with reserved draw solute and double active layers

A forward osmosis membrane, dual-active technology, applied in the field of membrane separation to achieve the effect of improving permeation flux

Active Publication Date: 2019-04-12
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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  • Method for preparing positive osmosis membrane with reserved draw solute and double active layers
  • Method for preparing positive osmosis membrane with reserved draw solute and double active layers
  • Method for preparing positive osmosis membrane with reserved draw solute and double active layers

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preparation example Construction

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

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

[0043] Step B: Dissolve the polyamine in deionized water to form a polyamine solution of 1 to 7 wt%;

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

[0045] Step D: Dissolve polybasic acid chloride in n-hexane solution to form a 0.01-1wt% polybasic acid chloride solution;

[0046] Step E, soak 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, use filter paper to absorb the residual solution on the surface of the support layer, place it in a suctio...

Embodiment 1

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

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

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

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

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

[0055] (6) Take out the polyacrylonitrile fiber support layer reserved for extraction solute (NaCl), absorb the excess water with filter paper, and place it in a suction filter device, so that the single layer is soaked in 0.2wt% trimesoyl chloride / n-hexane 30s in alkane to obtain a polyamid...

Embodiment 2

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

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

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

[0065] (4) Dissolve trimesoyl chloride in the n-hexane solution to form a 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 the extraction solute (NaCl), absorb the excess water with filter paper, and place it in a suction filter device, so that the single layer is soaked in 0.2wt% trimesoyl chloride / n-hexane 30s in alkane to obtain a polyamide active layer, re...

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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 received extensive attention and vigorous promotion in recent years because it does not require the addition of chemical reagents in the separation process and is simple 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 membrane pore size. In the separation process, the forward osmosis membrane has the advantages of high separation effici...

Claims

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Application Information

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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
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