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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 effects of high reuse rate, low reagent price, and good market promotion prospects

Active Publication Date: 2013-02-13
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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specific Embodiment approach 1

[0016] Specific embodiment one: the preparation method of the high-performance forward osmosis membrane of this embodiment is realized according to the following steps:

[0017] 1. Mix the film-forming polymer, additives and solvents according to the ratio of parts by weight (15-25): (0-12): (63-85), and prepare a film-casting solution after sealing, stirring and defoaming, and then Using phase inversion method to make flat membrane or hollow fiber membrane;

[0018] 2. Soak the flat membrane or hollow fiber membrane prepared in step 1 in a hot water bath at 50-100°C for 0.5-12 hours, and then put it in a temperature of 5-50°C, a pH value of 2-11, and a concentration of Soak in an organic solution of 50-20000 mg / L for 0.5-12 hours, take it out and wash it with deionized water for 3-5 times, put it into an aqueous solution of glycerol with a volume concentration of 20-70% and soak it for 0.5-3 hours, take it out and dry it in the air. Store in a dry box to complete the prepara...

specific Embodiment approach 2

[0022] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, the film-forming polymer, additive and solvent are mixed at a weight ratio of 15:0:85. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0023] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in Step 1, the film-forming polymer, additives and solvents are mixed at a ratio of parts by weight of 25:12:63. Other steps and parameters are the same as those in Embodiment 1.

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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 present invention relates to methods 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, this technology has problems such as high energy consumption, high membrane pollution, and concentrated water discharge. In recent years, the research on 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 the following advantages: low energy consumption, low membrane fouling tendency, high recovery rate, and less concentrated brine di...

Claims

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Application Information

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