Modification method capable of improving permeation flux of polyamide composite membranes

A technology of permeation flux and polyamide, which is applied in the field of modification to improve the permeation flux of polyamide composite membranes, can solve the problems of pollution, reduce the interception performance, and the water quality of the produced water does not meet the requirements, and achieves accelerated mass transfer and application scope. Wide, improve the effect of membrane separation performance

Active Publication Date: 2020-02-04
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual use, the polyamide composite membrane is easily polluted by organic matter in the feed liquid, and periodic chemical cleaning is required. If the thickness of the polyamide separation layer is too thin, it is easy to cause defects and reduce the retention performance, resulting in water production. Water quality does not meet the requirements

Method used

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  • Modification method capable of improving permeation flux of polyamide composite membranes

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The commercialized polyamide composite nanofiltration membrane is washed with pure water, and the aqueous solution (pH=4.0 ) for 4 hours, take it out and wash it with pure water; then soak it in an ethanol / water (mass ratio 1:1) solution with a mass concentration of 1,4-butane sultone of 10%, after 15 hours Take it out and wash it with pure water, set aside.

[0021] The salt rejection rate and water flux of the nanofiltration membrane were tested under the conditions of NaCl concentration of 500mg / l, pressure of 0.5MPa, temperature of 25°C, and pH value of 7.0-8.0. The results are shown in Table 1.

Embodiment 2

[0023] The commercialized polyamide composite nanofiltration membrane is washed with pure water, and the aqueous solution (pH=4.0 ) for 4 hours, take it out and wash it with pure water; then soak it in 1,3-propane sultone mass concentration of 10% ethanol / water (mass ratio 1:1) solution, after 15 hours Take it out and wash it with pure water, set aside.

[0024] The salt rejection rate and water flux of the nanofiltration membrane were tested under the conditions of NaCl concentration of 500mg / l, pressure of 0.5MPa, temperature of 25°C, and pH value of 7.0-8.0. The results are shown in Table 1.

Embodiment 3

[0026] The commercialized polyamide composite nanofiltration membrane is washed with pure water, and the aqueous solution (pH=4.0 ) for 4 hours, take it out and wash it with pure water; then soak it in an ethanol / water (mass ratio 1:1) solution with a mass concentration of 1,3-propane sultone of 5%, after 15 hours Take it out and wash it with pure water, set aside.

[0027] The salt rejection rate and water flux of the nanofiltration membrane were tested under the conditions of NaCl concentration of 500mg / l, pressure of 0.5MPa, temperature of 25°C, and pH value of 7.0-8.0. The results are shown in Table 1.

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Abstract

The invention relates to a modification method capable of improving permeation flux of polyamide composite membranes. The method uses 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and sultone to successfully introduce amphoteric molecules to the surface and pore walls of a polyamide composite membrane, and uses the stronger hydrophilicity of the amphoteric molecules to improve the separation performance of the composite membrane. The method has the following advantages: (1) the modification method is simple to operate, does not need to synthesize a specific monomer, and does notsacrifice the retention performance of the original composite membrane; and (2) the method has a wide application range, easily realizes large-scale production, and can effectively improve the permeation flux of the polyamide composite membranes such as reverse osmosis membranes, forward osmosis membranes and nanofiltration membranes.

Description

technical field [0001] The invention relates to a modification method for improving the permeation flux of a polyamide composite membrane, which belongs to the technical field of separation membrane preparation. The permeation flux of osmosis, forward osmosis, nanofiltration membranes, etc., and the retention performance of the original composite membrane remain unchanged, laying a foundation for further expanding the application fields of membrane separation technologies such as reverse osmosis, forward osmosis, and nanofiltration. Background technique [0002] As an emerging separation technology, membrane filtration technology has the advantages of high efficiency, low energy consumption, and easy operation. It can realize the recycling of wastewater and the recycling of useful substances. It is widely used in drinking water purification, wastewater treatment, and biopharmaceuticals. , petrochemical and other fields, currently used membrane materials mainly include cellul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/56B01D69/02
CPCB01D69/125B01D67/0006B01D71/56B01D69/02B01D2325/36B01D2323/02Y02A20/131
Inventor 俞三传刘梅红
Owner ZHEJIANG SCI-TECH UNIV
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