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Preparation method of high-flux composite polyamide reverse osmosis membrane

A composite polyamide and reverse osmosis membrane technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of difficult application, sacrifice of membrane desalination rate, etc., to improve water permeability and save costs , the effect of simple operation

Active Publication Date: 2019-01-11
HUNAN KEENSEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above all focus on adding different substances to the two phases (water phase and oil phase) of the interfacial polymerization reaction to increase the water flux of the polyamide reverse osmosis membrane. Although the water flux of the membrane is improved, it is sacrificed to varying degrees. The salt rejection rate of the diaphragm is not easy to apply in large production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The reverse osmosis membrane production method is as follows:

[0042] 1. Preparation of polysulfone supporting base membrane: Weigh 85g polysulfone and 0.5g polyvinylpyrrolidone and add them to 414.5g N,N-dimethylformamide (DMF) under stirring, and the rest of the operations are the same as in Comparative Example 1;

[0043] 2. Preparation of aqueous phase liquid: same as Comparative Example 1;

[0044] 3. Preparation of oil phase solution: same as Comparative Example 1;

[0045] 4. The film-making method is the same as in Comparative Example 1.

[0046] The membrane detection method is the same as in Comparative Example 1, and the results are shown in Table 1.

Embodiment 2

[0048] The reverse osmosis membrane production method is as follows:

[0049] 1. Preparation of polysulfone supporting base membrane: Weigh 75g polysulfone and 5g polyethylene glycol and add them to 420g N,N-dimethylformamide (DMF) under stirring, and the rest of the operations are the same as in Comparative Example 1;

[0050] 2. Preparation of aqueous phase liquid: same as Comparative Example 1;

[0051] 3. Preparation of oil phase solution: same as Comparative Example 1;

[0052] 4. The film-making method is the same as in Comparative Example 1.

[0053] The membrane detection method is the same as in Comparative Example 1, and the results are shown in Table 1.

Embodiment 3

[0055] The reverse osmosis membrane production method is as follows:

[0056] 1. Preparation of polysulfone supporting base membrane: Weigh 70g of polysulfone and 1.5g of polyethylene glycol and add them to 428.5g of N,N-dimethylformamide (DMF) under stirring, and the rest of the operations are the same as in Comparative Example 1;

[0057] 2. Preparation of aqueous phase liquid: same as Comparative Example 1;

[0058] 3. Preparation of oil phase solution: same as Comparative Example 1;

[0059] 4. The film-making method is the same as in Comparative Example 1.

[0060] Diaphragm detection method is the same as Comparative Example 1, and the results are shown in Table 1

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Abstract

The invention relates to a preparation method of a high-flux composite polyamide reverse osmosis membrane. The preparation method comprises the following steps: (1) preparing a polysulfone support base membrane: dissolving polysulfone and a hydrophilic substance in a polar solvent according to a certain ratio in order to obtain a mixed solution, filtering the obtained solution after the polysulfone is completely dissolved, defoaming the obtained filtrate at a predetermined temperature for a predetermined time, uniformly coating a nonwoven fabric, used as a support base material, with the obtained defoamed polysulfone solution, performing solidifying treatment, and repeatedly rinsing the solidified polysulfone support base membrane with deionized water, wherein the mass concentration of polysulfone in the mixed solution is 14-17%, the hydrophilic substance is polyethylene glycol or polyvinylpyrrolidone, and the mass concentration of the hydrophilic substance is 0.1-1%; and (2) coating with an aqueous phase solution; and (3) coating with an oil phase solution. The flux of the reverse osmosis membrane prepared by the method is increased, so the working efficiency and the working ability are improved, and the removal rate of sodium chloride is ensured; and the preparation method has the advantages of simplicity in operation, cost saving, and easiness in application to commercial large-scale production.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a method for preparing a high-flux composite polyamide reverse osmosis membrane. Background technique [0002] Polyamide composite reverse osmosis membrane has become a mainstream product in the field of reverse osmosis due to its good salt rejection rate and water flux; Water flux has become an important direction of current research. [0003] The aromatic polyamide composite reverse osmosis membrane generally uses a porous ultrafiltration membrane made of polysulfone, polyethersulfone or polyacrylonitrile as a support layer, and then uses two highly active reactive monomers on the surface of the support layer to perform interfacial polymerization. Dense desalination layer. In recent years, various membrane manufacturers and researchers have done a lot of work on how to improve the water flux of reverse osmosis membranes. US patent 20130037482 uses acetone, isopro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/10B01D71/56B01D67/00B01D61/02
CPCB01D61/025B01D67/0088B01D67/0093B01D69/02B01D69/105B01D71/56B01D2325/30
Inventor 曾浩浩石楚道石世业
Owner HUNAN KEENSEN TECH CO LTD
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