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Preparation method for cellulose acetate forward osmosis membrane

A cellulose acetate, forward osmosis membrane technology, applied in the field of membrane separation, can solve the problems of low strength of unsupported membrane, complicated preparation process, internal concentration polarization, etc., and achieves high mechanical strength, simple membrane forming process, high water content Effects of flux and salt rejection

Inactive Publication Date: 2016-05-11
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN104069746A introduces a method of using ionic liquid as solvent, dissolving cellulose to prepare casting liquid, and preparing cellulose forward osmosis membrane by phase inversion method; The method for preparing a forward osmosis membrane transferred to a deionized water coagulation bath, the prepared membrane is a cellulose acetate active layer on both sides, and the middle is a forward osmosis membrane of a polysulfone base membrane; Su et al. (SuJincaietal, 2010) Cellulose acetate hollow fiber nanofiltration membranes were prepared for forward osmosis experiments, which showed that the membranes had high NaCl rejection but low pure water flux
At present, there are many studies on cellulose acetate forward osmosis membranes, but most of them use complex casting solution systems, the preparation process is complicated, the strength of the unsupported membranes is low, or the thicker support layer causes serious inner concentration differences. phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 15g of dry cellulose acetate powder, add 85g of NMP (N-methylpyrrolidone), place in a water bath at 45°C, and stir mechanically until a uniform solution is formed; place the solution in a vacuum environment at 45°C for defoaming 18h, forming the casting solution; pour the casting solution on a clean glass plate at 20°C, and evenly coat the casting solution on the glass plate with a scraper with a thickness of 250 μm; immediately cover the 200-mesh polyester mesh on the The surface of the casting solution was quickly transferred to an oven at 40°C to volatilize for 70 seconds; the glass plate with the casting solution was placed in a flowing deionized hydrogel bath at 5°C for 6 hours; the new film was peeled off from the glass plate, Place in a water bath at 90°C for 30 minutes to obtain a cellulose acetate forward osmosis membrane.

[0024] The thickness of the forward osmosis membrane prepared in this embodiment is 213 μm, and the porosity is 72.1%. The forward ...

Embodiment 2

[0026] Weigh 15g of dry cellulose acetate powder, dissolve it in a mixed solvent consisting of 10g acetone and 75g NMP, place it in a water bath at 30°C, and stir it mechanically until a uniform solution is formed; place this solution in a vacuum environment at 30°C Set it for defoaming for 12 hours to form a casting solution; pour the casting solution on a clean glass plate at 25°C, and use a scraper with a thickness of 250 μm to evenly coat the casting solution on the glass plate; immediately put 200 mesh polyester The net is covered on the surface of the casting solution, and quickly transferred to an oven at 50°C to volatilize for 60 seconds; the glass plate with the casting solution is placed in a flowing deionized hydrogel bath at 5°C for 6 hours; the new film and the glass The plate was peeled off and placed in a water bath at 90°C for 10 minutes to obtain a cellulose acetate forward osmosis membrane.

[0027] The thickness of the forward osmosis membrane prepared in th...

Embodiment 3

[0029] Weigh 17g of dry cellulose acetate powder, dissolve it in a mixed solvent composed of 10g acetone and 73g NMP, place it in a water bath at 45°C, and stir it mechanically until a uniform solution is formed; place this solution in a vacuum environment at 45°C Set it for defoaming for 18 hours to form a casting solution; pour the casting solution on a clean glass plate at 15°C, and use a scraper with a thickness of 200 μm to evenly coat the casting solution on the glass plate; immediately pour 150 mesh polyester The net is covered on the surface of the casting solution, and quickly transferred to an oven at 20°C to volatilize for 90 seconds; the glass plate with the casting solution is placed in a flowing deionized hydrogel bath at 0°C for 12 hours; the new film and the glass The plate was peeled off and placed in a water bath at 80°C for 20 minutes to obtain a cellulose acetate forward osmosis membrane.

[0030] The thickness of the forward osmosis membrane prepared in th...

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Abstract

The invention relates to a preparation method for a cellulose acetate forward osmosis membrane, and belongs to the technical field of membrane separation. The preparation method comprises the steps that dried cellulose acetate powder is dissolved in mixed organic solvent, and the mixture is put into a water bath to be mechanically stirred to form a uniform solution; the solution is put into a vacuum environment for standing and defoaming to form a membrane casting solution; the membrane casting solution is poured on a clean glass board and uniformly applied on the glass board with a scraper; the surface of the membrane casting solution is covered with a polyester screen immediately, and the membrane casting solution is quickly transferred into a baking oven for volatilization; the glass board with the membrane casting solution is put into a flowing deionized water gel bath; a regenerative membrane piece is stripped from the glass board and then put into a water bath at the temperature of 50 DEG C-90 DEG C, and the cellulose acetate forward osmosis membrane is obtained. The preparation method is simple in technology and easy to operate, and the prepared membrane is excellent in mechanical performance and high in water flux and has the higher salt intercepting rate and the lower inner concentration polarization phenomenon.

Description

technical field [0001] The invention relates to a preparation method of a cellulose acetate forward osmosis membrane, belonging to the technical field of membrane separation. Background technique [0002] Water resources are the most critical resources for human production and life. Nowadays, the ecological environment has been severely damaged, and the water body is seriously polluted. The protection of water resources and the control of water pollution have become the most concerned issues in modern society. Membrane water treatment technology is one of the important water treatment technologies. Traditional ultrafiltration, nanofiltration and reverse osmosis technologies are membrane separation processes driven by hydraulic pressure differences, which require high equipment and consume a lot of energy. Forward osmosis (F0) technology is a new membrane separation technology developed in recent years. Forward osmosis is a spontaneous process. The two sides of the membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/10B01D67/00
CPCB01D71/16B01D67/0011B01D69/10B01D2325/02B01D2325/04B01D2325/24
Inventor 王军李国亮刘会娟侯得印
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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