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A kind of 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: 2021-09-21
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 anti-osmosis membrane production method is as follows:

[0042] 1. Preparation of a polysulfone support base film: 85 g of polysulfone, 0.5 g of polyvinylpyrrolidone is added to 414.5 g n, N-dimethylformamide (DMF) in a stirred state, and the remaining operation is the same. 1;

[0043] 2, formulation of the aqueous phase fluid: the same ratio 1;

[0044] 3, formulation of oil phase solution: the same ratio 1;

[0045] 4, the film formation method is the same as the proportion 1.

[0046] The diaphragm detecting method is the same as a comparison 1, and the results are shown in Table 1.

Embodiment 2

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

[0049] 1. Preparation of a polysulfone support base film: 75 g of polysulfone, 5 g of polyethylene glycol is added to 420 g n, N-dimethylformamide (DMF) in a stirred state, and the remaining operation is the same. 1;

[0050] 2, formulation of the aqueous phase fluid: the same ratio 1;

[0051] 3, formulation of oil phase solution: the same ratio 1;

[0052] 4, the film formation method is the same as the proportion 1.

[0053] The diaphragm detecting method is the same as a comparison 1, and the results are shown in Table 1.

Embodiment 3

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

[0056] 1. Preparation of a polysulfone support base film: 70 g of polysulfone, 1.5 g of polyethylene glycol in a stirred state of 428.5 gn, N-dimethylformamide (DMF), and the remaining operation is the same. 1;

[0057] 2, formulation of the aqueous phase fluid: the same ratio 1;

[0058] 3, formulation of oil phase solution: the same ratio 1;

[0059] 4, the film formation method is the same as the proportion 1.

[0060] The diaphragm detecting method is the same as a comparison 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, which comprises the following steps: (1) preparation of a polysulfone supporting base membrane: mixing polysulfone with a water-based substance dissolved in a polar solvent in a certain proportion Solution, after the polysulfone is completely dissolved, filter, and the filtrate is subjected to degassing treatment at a predetermined temperature for a predetermined time; using non-woven fabric as a supporting substrate, evenly coat the degassed polysulfone solution on the supporting substrate And carry out coagulation treatment, rinse the polysulfone supporting basement membrane after coagulation with deionized water repeatedly, the mass concentration of polysulfone in the described mixed solution is 14%~17%, hydrophilic substance is polyethylene glycol or polyethylene Pyrrolidone, its mass concentration is 0.1%~1%; (2) the coating of water phase solution; (3) the coating of oil phase solution; the reverse osmosis membrane flux prepared by this method increases, has improved work efficiency and work ability At the same time, the removal rate of sodium chloride is guaranteed, and the preparation process is simple and cost-saving, and can be easily applied to large-scale commercial production.

Description

Technical field [0001] Technical Field The present invention relates to the preparation of films, particularly high-throughput method for making a composite polyamide reverse osmosis membrane. Background technique [0002] As the polyamide composite reverse osmosis membrane with good water flux and salt rejection, it has now become a mainstream product in the field of reverse osmosis; however, in energy conservation, under the green background, to further reduce the operating pressure of the film and improve film the water flux is an important direction of current research. [0003] Aromatic polyamide composite reverse osmosis membrane is generally used, polysulfone, polyether sulfone, polyacrylonitrile ultrafiltration membrane or a porous material as the support layer, and then use the two active high reactive monomer on the surface of the support layer interfacial polymerization reaction to form desalting dense layer. In recent years, various film manufacturers and researchers ...

Claims

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Application Information

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Patent Type & Authority Patents(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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