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Cellulose acetate forward osmotic membrane and preparation method thereof

A technology of cellulose acetate and forward osmosis membrane, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as complex experimental methods, achieve good salt cut-off effect, increase salt cut-off rate, and small molecular weight Effect

Active Publication Date: 2014-01-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the current invention patents, some exploratory and comparative experiments have been done on various film-forming solutes, solvents, and additives. The film-making methods used are to scrape the film with a scraper. The film-forming solutes include CA, CTA, and cellulose acetate butyrate. Su et al., their experimental method is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Preparation of raw materials: 3.0 g of cellulose acetate, the molecular weight of cellulose acetate is 40320 g / mol, 52.5 ml of 1,4-dioxane, 22 ml of acetone, 8.2 ml of methanol, and 6.6 ml of lactic acid;

[0026] Step 2: Add the solid and liquid weighed in step 1 into a round-bottomed flask and mix evenly, mechanically stir at room temperature to completely dissolve the cellulose acetate to obtain a cellulose acetate casting solution, and let the casting solution stand for more than 12 hours to use its complete defoaming;

[0027] Step 3: Soak the porous polysulfone membrane JQE-3631-130326 produced by Shenzhen Jiaquan Membrane Filtration Equipment Co., Ltd. with a sodium hydroxide solution with a mass concentration of 10% for 30 minutes to remove impurities adsorbed on the surface. Then wash and dry with deionized water for later use;

[0028] Step 4: Soak the polysulfone membrane support layer obtained from the pretreatment in step 3 in the casting solution ...

Embodiment 2

[0033] Step 1: Preparation of raw materials: 3.3g of cellulose acetate, the molecular weight of cellulose acetate is 40320g / mol, 52.5ml of 1,4-dioxane, 22ml of acetone, 8.2ml of methanol, 6.6ml of lactic acid;

[0034] Step 2: Add the solid and liquid weighed in step 1 into a round-bottomed flask and mix evenly, mechanically stir at room temperature to completely dissolve the cellulose acetate to obtain a cellulose acetate casting solution, and let the casting solution stand for more than 12 hours to use its complete defoaming;

[0035] Step 3: Soak the porous polysulfone membrane with 10% sodium hydroxide solution to remove the impurities adsorbed on the surface, then wash it with deionized water and dry it for later use;

[0036] Step 4: Soak the support layer obtained from the pretreatment in step 3 in the casting solution in step 2 for 60 seconds, pull it once and then soak it in deionized water for 6 hours for phase inversion;

[0037] Step 5: heat-treat the membrane obtai...

Embodiment 3

[0041] Step 1: Preparation of raw materials: 3.3g of cellulose acetate, the molecular weight of cellulose acetate is 40320g / mol, 52.5ml of 1,4-dioxane, 22ml of acetone, 8.2ml of methanol, 6.6ml of lactic acid;

[0042] Step 2: Add the solid and liquid weighed in step 1 into a round-bottomed flask and mix evenly, mechanically stir at room temperature to completely dissolve the cellulose acetate to obtain a cellulose acetate casting solution, and let the casting solution stand for more than 12 hours to use its complete defoaming;

[0043] Step 3: Soak the porous polysulfone membrane with 10% sodium hydroxide solution to remove the impurities adsorbed on the surface, then wash it with deionized water and dry it for later use;

[0044] Step 4: Soak the support layer obtained from the pretreatment in step 3 in the casting solution in step 2 for 60 seconds, pull it once and then soak it in deionized water for 6 hours for phase inversion;

[0045] Step 5: heat-treat the membrane obt...

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Abstract

The invention relates to a cellulose acetate forward osmotic membrane and a preparation method of the cellulose acetate forward osmotic membrane. The preparation method comprises the following steps: preparing raw materials according to a ratio of adding 20ml-40ml of acetone, 50ml-70ml of 1,4-dioxane and 7ml-10ml of methanol into 3g-5g of cellulose acetate; adding a pore former, namely 5ml-10ml of lactic acid or 0.8g-28g of zinc chloride; uniformly mixing the raw materials and completely dissolving the cellulose acetate under room-temperature agitation; standing a membrane casting solution for more than 12 hours; immersing and treating by a sodium hydroxide solution; immersing a mixture into the membrane casting solution for 30-60 seconds; and pulling for one time and immersing into de-ionized water for carrying out phase inversion for 2-6 hours so as to obtain the cellulose acetate forward osmotic membrane, wherein a middle base membrane is a polysulfone membrane and attached cellulose acetate membranes are formed on the two sides of the base membrane. The preparation method is simple in process and the prepared forward osmotic membrane can effectively prevent solutes from entering a porous supporting layer; the cellulose acetate forward osmotic membrane has good chemical stability and high salt rejection rate and membrane flux.

Description

technical field [0001] The invention relates to a forward osmosis membrane, in particular to a cellulose acetate forward osmosis membrane and a preparation method thereof, belonging to the technical field of polymer separation membranes. Background technique [0002] Rapid population growth and depletion of fossil fuels have made water and energy two of the world's most important resources. Water shortages and energy crises plague many parts of the world, and it is reported that more than 1.2 billion people in the world lack clean and healthy drinking water. Membrane separation technology operates at room temperature and has no phase change. It is a promising technology for regenerating drinking water. [0003] The forward osmosis technology developed in recent years is a technology that uses the principle of osmosis for membrane separation. The difference in osmotic pressure of the solution on both sides of the membrane is used to make water molecules spontaneously pass th...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D69/10B01D67/00
Inventor 黄肖容刘子文隋贤栋
Owner SOUTH CHINA UNIV OF TECH
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