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Forward osmotic membrane preparation method

A technology of forward osmosis membrane and ultrafiltration base membrane, which is applied in the field of forward osmosis membrane preparation, can solve the problems of complex forward osmosis membrane method and high cost, and achieve the effects of controllable side reactions, low cost and mild conditions

Active Publication Date: 2015-11-11
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of complex and high-cost methods for preparing forward osmosis membranes, and provides a method for preparing forward osmosis membranes

Method used

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  • Forward osmotic membrane preparation method
  • Forward osmotic membrane preparation method

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specific Embodiment approach 1

[0016] Specific embodiment one: the preparation method of a kind of forward osmosis membrane of this embodiment comprises the following steps:

[0017] One, solvent, pore-forming agent and polyacrylonitrile are mixed, make polyacrylonitrile solution;

[0018] 2. Utilize the immersion-precipitation phase inversion method to make the polyacrylonitrile solution into an ultrafiltration base membrane, wash with deionized water for 3 to 5 times, and obtain a polyacrylonitrile base membrane;

[0019] 3. Put the polyacrylonitrile-based membrane in sodium hydroxide solution and react at 20°C-50°C for 20min-60min. After the reaction, take out the polyacrylonitrile-based membrane and soak it in deionized water for 0.5-2h , and then immersed in hydrochloric acid solution for 1 to 5 hours to obtain the treated polyacrylonitrile-based membrane;

[0020] 4. Immerse the polyacrylonitrile base membrane treated in step 3 in the aniline-ethanol solution, soak for 170-190min, then take it out, a...

specific Embodiment approach 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the solvent in Step 1 is N-methylpyrrolidone. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the pore-forming agent in step 1 is polyethylene glycol or polyvinylpyrrolidone. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a forward osmotic membrane preparation method. The forward osmotic membrane preparation method is used for solving the problem that an existing forward osmotic membrane preparation method is complicated and high in cost. The forward osmotic membrane preparation method comprises the steps of preparing a polyacrylonitrile solution, preparing a polyacrylonitrile basal membrane, preparing a treated polyacrylonitrile basal membrane, preparing an ultra-filtration basal membrane containing aniline, preparing a composite crude nano-filtration membrane crude product, soaking the product in an ethanol water solution, then soaking the product in TRIS, then adding polyethyleneimine and gallic acid, performing crosslinking coating to obtain a forward osmotic membrane. The polyethyleneimine and the gallic acid adopted in the preparation method are low in price and cost, polymerization reaction between the polyethyleneimine and the gallic acid easily occurs, side reaction is controllable, conditions are moderate, the obtained composite forward osmotic membrane has good separating performance, and the forward osmotic membrane preparation method is applied to the fields of antibiotic separation, fruit juice concentration and seawater desalination.

Description

technical field [0001] The invention relates to a preparation method of a forward osmosis membrane. Background technique [0002] Due to the depletion of fresh water resources, seawater desalination technology is getting more and more attention. Among them, membrane separation technology, especially new membrane separation technology, is attracting widespread attention from scientists. Among them, forward osmosis technology is a membrane separation technology developed in recent years, and it is a technology that relies on solution osmotic pressure as a driving force to achieve target solution separation. Forward osmosis refers to the process in which water flows from the higher water chemical potential (or lower osmotic pressure) side area to the lower water chemical potential (or higher osmotic pressure) side area through the selectively permeable membrane. Two solutions with different osmotic pressures are placed on both sides of the selectively permeable membrane, one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D69/12B01D67/00
Inventor 邵路张聪程喜全
Owner HARBIN INST OF TECH
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