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Method for enhancing chlorine resistance of hollow fiber nanofiltration membrane

A nanofiltration membrane and fiber technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex technical process, long processing time, unfavorable industrialization, etc. long lasting effect

Active Publication Date: 2019-04-19
TIANJIN MOTIMO MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the need to change the pre-order process parameters such as formula and process, it cannot be used for purchased commercial membranes
In addition, there are also some patented technical processes that are relatively complicated or the processing time is too long, which is not conducive to industrialization, such as CN 108176246 A, CN 103272498A

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Water phase A: 5 parts by mass of acetic anhydride, 100 parts by mass of deionized water.

[0012] Water phase B: 1 mass part of sodium hydroxide, 100 parts of deionized water.

[0013] Pour water phase A into the assembly, infiltrate for 4 h, and pressure 0.5 MPa. After pouring out, add water phase B and infiltrate for 30 min. Rinse with RO water at 0.5 MPa until the conductivity of the product water is less than 10 uS, then immerse in water for testing.

Embodiment 2

[0015] Water phase A: 15 parts by mass of propionic anhydride, 100 parts of deionized water.

[0016] Water phase B: 2 parts by mass of sodium hydroxide, 100 parts of deionized water.

[0017] Pour water phase A into the assembly, infiltrate for 1 h, and pressure 0.5 MPa. After pouring out, add water phase B and infiltrate for 30 min. Rinse with RO water at 0.5 MPa until the conductivity of the product water is less than 10 uS, then immerse in water for testing.

Embodiment 3

[0019] Water phase A: 5 parts by mass of β-propiolactone, 100 parts of deionized water.

[0020] Water phase B: 1 mass part of sodium hydroxide, 100 parts of deionized water.

[0021] Pour water phase A into the assembly, infiltrate for 1 h, and pressure 0.5 MPa. After pouring out, add water phase B and infiltrate for 10 min. Rinse with RO water at 0.5 MPa until the conductivity of the product water is less than 10 uS, then immerse in water for testing.

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PUM

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Abstract

The invention discloses a method for enhancing chlorine resistance of a hollow fiber nanofiltration membrane. The method includes the following steps: pouring a water phase A into a hollow fiber nanofiltration assembly, and performing soaking for 1-4 h, pressure being 0.5 Mpa; adding a water phase B into the hollow fiber nanofiltration assembly after pouring out, and performing soaking for 5-30 min; and using RO water to perform washing until water conductivity is less than 10 uS under 0.5 MPa after pouring out so that the step is finished. The water phase A consists of 5-20 parts by mass of an end-capping reagent and 100 parts of deionized water; and the water phase B consists of 1-5 parts by mass of a terminating agent and 100 parts of the deionized water. The method is simple, efficient, lasting in effect, low in cost and suitable for industrialization.

Description

technical field [0001] The invention relates to the technical field of membranes, and more specifically relates to a method for improving the chlorine resistance of hollow fiber nanofiltration membranes. Background technique [0002] In the current technology, many technologies use aldehyde-amine condensation reaction to form a protective layer on the surface of nanofiltration or reverse osmosis membranes to delay the corrosion of chlorine-containing chemicals such as sodium hypochlorite, such as CN 103331110 A, CN 105413499 A. However, aldehyde-amine condensation is a reversible reaction, and its durability is doubtful. However, CN 104379243 A, CN 107899434 A, etc. rely on adsorption to varying degrees, and there are also doubts about the durability of the effect. For patents CN 104023830 A, CN 106669438 A, etc., it is a good idea to fundamentally reduce the possibility of corrosion by changing monomers or other raw materials and starting from the structure of the desalina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D63/02B01D65/00
CPCB01D61/027B01D63/02B01D65/00
Inventor 王春浩胡晓宇梁恩宾
Owner TIANJIN MOTIMO MEMBRANE TECH