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Preparation method of high performance forward osmosis membrane

A forward osmosis membrane, high-performance technology, applied in the field of membrane modification, can solve the problem of high salt back-mixing flux, achieve the effect of simple invention process, reduce salt back-mixing flux, and improve selectivity

Active Publication Date: 2014-10-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high salt backmixing flux in the existing seawater desalination forward osmosis membrane, and to provide a method for preparing a high-performance forward osmosis membrane

Method used

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  • Preparation method of high performance forward osmosis membrane
  • Preparation method of high performance forward osmosis membrane
  • Preparation method of high performance forward osmosis membrane

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Experimental program
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specific Embodiment approach 1

[0016] Specific implementation mode 1: The preparation method of the high-performance forward osmosis membrane of this embodiment is implemented in the following steps:

[0017] 1. Mix the film-forming polymer, additives and solvent according to the weight ratio (15~25): (0~12): (63~85), seal, stir, and degas to prepare a casting liquid, and then Use phase inversion method to make flat membrane or hollow fiber membrane;

[0018] 2. Put the flat membrane or hollow fiber membrane prepared in step 1 into a 50-100℃ hot water bath for 0.5-12h, then put it in a temperature of 5-50℃, a pH value of 2-11, and a concentration of Soak in 50~20000mg / L organic solution for 0.5~12h, take it out and wash it with deionized water for 3~5 times, put it in 20~70% glycerol aqueous solution, soak it for 0.5~3h, take it out and dry it. Store in a dry box to complete the preparation of high-performance forward osmosis membranes;

[0019] The film-forming polymer in step one is one or a mixture of polysul...

specific Embodiment approach 2

[0022] Specific embodiment two: this embodiment is different from specific embodiment one in that in step one, the film-forming polymer, additives and solvent are mixed at a weight ratio of 15:0:85. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Specific embodiment three: This embodiment is different from specific embodiment one in that in step one, the film-forming polymer, additives and solvent are mixed at a weight ratio of 25:12:63. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention discloses a preparation method of high-performance forward osmosis membrane and relates to a method of membrane modification. The preparation method aims at solving the problem that the salt back-mixing flux of existing sea water desalination forward osmosis membrane is high. The method comprises the following steps: 1, mixing a membrane forming polymer, an addition agent and a solvent to prepare membrane casting liquid, and forming membrane by a phase inversion method; 2, putting the membrane in hot water bath to dip, then putting the membrane in an organic solution to dip, using deionized water to wash, putting the membrane in glycerol aqueous solution to dip, after taking the membrane out, drying the membrane by airing, storing the membrane in a drying tank. According to the preparation method of the high-performance forward osmosis membrane, common chemical reagents are used for preparing a macromolecule permeable membrane material, so that under the condition of keeping water flux not to be reduced (even if the water flux is increased), the salt back-mixing flux is lowered, the selectivity of forward osmosis technology to ions (or molecules) in water is effectively improved, and the preparation method has very important practical significance to the practical application of the forward osmosis technology. Meanwhile, the preparation method has advantages of being simple in process, convenient to operate, low in reagent price and high in repeating utilization rate.

Description

Technical field [0001] The invention relates to a method of membrane modification. Background technique [0002] Seawater desalination technology is an important method to develop and utilize seawater resources and solve the problem of global water shortage. Reverse osmosis technology is currently the main seawater desalination technology, but in the application process, the technology has problems such as high energy consumption, high membrane pollution, and concentrated water discharge. In recent years, forward osmosis (Forward Osmosis) seawater desalination technology has gradually attracted everyone's attention. Since the forward osmosis technology is driven by the chemical potential of the draw liquid itself, compared with the reverse osmosis technology driven by external pressure, the forward osmosis technology has: low energy consumption, low membrane pollution trend, high recovery rate, and less concentrated brine discharge , Wide application range and other advantages....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/06B01D69/08B01D71/68
Inventor 马军吕兴霖侯耀华杨一
Owner HARBIN INST OF TECH