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Preparation method of composite forward osmosis membrane

A forward osmosis membrane and bottom membrane technology, applied in the field of membrane separation, can solve the problems of being unsuitable for large-scale industrial production, narrow usable pH range, poor chemical and thermal stability, etc., to achieve improved water flux, good hydrophilicity, high The effect of mechanical strength

Active Publication Date: 2012-10-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commercial forward osmosis membranes are only produced by Hydration Technology Inc. of the United States through the phase inversion method. The related patent is WO2006110497A2. The material is cellulose acetate, so that its application is limited by the pH conditions of the treatment solution, and its membrane flux is low.
However, it has the disadvantages of poor chemical and thermal stability, easy degradation, and narrow pH range.
Another PBI forward osmosis membrane is expensive and not suitable for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step (1). Add 3Kg polysulfone and 2Kg polyethylene glycol to 5Kg dimethylformamide and stir at 40°C for 48 hours, then vacuum filter for 1 hour to obtain a uniformly dispersed polysulfone casting solution

[0019] Step (2). α-cyclodextrin is dissolved in distilled water to prepare an aqueous cyclodextrin solution with a cyclodextrin mass percentage of 0.05%; benzoyl chloride is dissolved in n-hexane to prepare a cyclodextrin mass percentage of 0.05% 0.05% n-hexane solution of benzoyl chloride;

[0020] Step (3). Use a scraper with a thickness of 10 μm to scrape the uniformly dispersed polysulfone casting solution on the non-woven fabric, and then immerse it in deionized water at 5 ° C. After the film is formed, remove the residual solvent with deionized water to obtain polysulfone Ultrafiltration bottom membrane;

[0021] Step (4). Soak the polysulfone ultrafiltration bottom membrane in the cyclodextrin aqueous solution for 1 minute, take it out and then soak it in the...

Embodiment 2

[0023] Step (1). Add 1.8Kg polysulfone and 0.2Kg polyvinylpyrrolidone to 8Kg dimethylacetamide and stir at 120°C for 12 hours, then vacuum filter for 2 hours to obtain a uniformly dispersed polysulfone casting solution

[0024] Step (2). Beta-cyclodextrin is dissolved in distilled water to prepare an aqueous cyclodextrin solution with a cyclodextrin mass percentage of 0.1%; benzoyl chloride is dissolved in n-hexane to prepare a cyclodextrin mass percentage of 0.1% n-hexane solution of benzoyl chloride;

[0025] Step (3). Use a scraper with a thickness of 20 μm to scrape the uniformly dispersed polysulfone casting solution on the non-woven fabric, and then immerse it in deionized water at 10 ° C. After the film is formed, remove the residual solvent with deionized water to obtain polysulfone Ultrafiltration bottom membrane;

[0026] Step (4). Soak the polysulfone ultrafiltration bottom membrane in the cyclodextrin aqueous solution for 2 minutes, take it out and then soak it in...

Embodiment 3

[0028] Step (1). Add 0.8Kg polysulfone and 1.2Kg lithium chloride to 8Kg dimethyl sulfoxide and stir at 80°C for 24 hours, then vacuum filter for 1.5 hours to obtain a uniformly dispersed polysulfone casting solution

[0029] Step (2). Gamma-cyclodextrin is dissolved in distilled water, and the cyclodextrin mass percentage that is mixed with cyclodextrin is 1% cyclodextrin aqueous solution; Tribenzoyl chloride is dissolved in normal hexane, is mixed with tribenzoyl chloride mass percentage is 1% n-hexane solution of benzoyl chloride;

[0030] Step (3). Use a scraper with a thickness of 100 μm to scrape the uniformly dispersed polysulfone casting solution on the non-woven fabric, and then immerse it in deionized water at 20 ° C. After the film is formed, remove the residual solvent with deionized water to obtain polysulfone Ultrafiltration bottom membrane;

[0031] Step (4). Soak the polysulfone ultrafiltration bottom membrane in the cyclodextrin aqueous solution for 5 minutes...

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Abstract

The invention relates to a preparation method of a composite forward osmosis membrane. At present, a phenomenon of inner concentration polarization exists in a forward osmosis process. The method disclosed by the invention comprises the following steps of: firstly, adding polysulfone and an additive into a solvent to be agitated and dissolved to obtain a polysulfone membrane casting solution which is uniformly dispersed; preparing a cyclodextrin aqueous solution with mass percent of 0.05-5% and a mellitic acyl chloride n-hexane solution; scraping the polysulfone membrane casting solution which is uniformly dispersed on non-woven fabric by using a scraper; immersing into de-ionized water of a coagulating bath to obtain a polysulfone ultra-filtering bottom membrane; and immersing the polysulfone ultra-filtering bottom membrane into the cyclodextrin aqueous solution and the mellitic acyl chloride n-hexane solution in sequence and curing to obtain the composite forward osmosis membrane. The method is simple in process; and the prepared composite forward osmosis membrane has the advantages of high mechanical strength, solvent resistance, relatively high water flux and high salt interception rate.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a composite forward osmosis membrane. Background technique [0002] Field permeation technology (FO) is a new concentration-driven membrane separation technology developed in recent years. It is a membrane process that uses the osmotic pressure difference on both sides of the selectively permeable membrane as the driving force. Forward osmosis technology has broad application prospects and can be used in sewage purification. Compared with reverse osmosis, it has the following advantages: forward osmosis is a spontaneous process that does not require external energy during the separation process; forward osmosis is a non-pressure driven system with almost no Membrane fouling; forward osmosis only needs to overcome the flow resistance, and there is no requirement for the material of the membrane module; the recovery rate of water in t...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/12B01D67/00
Inventor 薛立新孙元娜黄燕杜旭东
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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