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Hydrophilic polyamide reverse osmosis membrane with compact surface as well as preparation method and application thereof

A technology of reverse osmosis membrane and polyamide, used in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as membrane water flux decline

Pending Publication Date: 2020-07-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods will cause a rapid decline in the water flux of the membrane.

Method used

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  • Hydrophilic polyamide reverse osmosis membrane with compact surface as well as preparation method and application thereof
  • Hydrophilic polyamide reverse osmosis membrane with compact surface as well as preparation method and application thereof
  • Hydrophilic polyamide reverse osmosis membrane with compact surface as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for intercepting boric acid in nuclear power plant liquid effluents, comprising the steps of: placing a reverse osmosis membrane (polyamide commercial reverse osmosis membrane LE) in 25% isopropanol solution to soak for 20 minutes, and then cleaning with deionized water 6 times, 30 minutes each time, store in deionized water at 4°C; then place the reverse osmosis membrane in the modification pool, cover with carbodiimide solution for 10 minutes, then add N-hydroxysuccinimide solution , poured out the waste liquid after covering for 50 minutes, and cleaned the reverse osmosis membrane with deionized water for 2 times; then the concentration of the reverse osmosis membrane was 5%, and the proportion of branched polyethyleneimine (branching degree was 60%) was 100%. The solution was covered for 12 hours, and light-shielding treatment was carried out during the process. Afterwards, the waste liquid was poured out, and the membrane was washed twice with deionized wat...

Embodiment 2

[0043] A method for intercepting boric acid in nuclear power plant liquid effluents, comprising the steps of: placing a reverse osmosis membrane (polyamide commercial reverse osmosis membrane LE) in 25% isopropanol solution to soak for 20 minutes, and then cleaning with deionized water 6 times, 30 minutes each time, store in deionized water at 4°C; then place the reverse osmosis membrane in the modification pool, cover with carbodiimide solution for 10 minutes, then add N-hydroxysuccinimide solution , poured out the waste liquid after covering for 50 minutes, and cleaned the reverse osmosis membrane 2 times with deionized water; then the concentration of the reverse osmosis membrane was 5%, and the proportion of branched polyethyleneimine (branching degree was 60%) was 70%. The solution was covered for 12 hours, and light-shielding treatment was carried out during the process. Afterwards, the waste liquid was poured out, and the membrane was washed twice with deionized water to...

Embodiment 3

[0047] A method for intercepting boric acid in nuclear power plant liquid effluents, comprising the steps of: placing a reverse osmosis membrane (polyamide commercial reverse osmosis membrane LE) in 25% isopropanol solution to soak for 20 minutes, and then cleaning with deionized water 6 times, 30 minutes each time, store in deionized water at 4°C; then place the reverse osmosis membrane in the modification pool, cover with carbodiimide solution for 10 minutes, then add N-hydroxysuccinimide solution , poured out the waste liquid after covering for 50 minutes, and cleaned the reverse osmosis membrane 2 times with deionized water; then the concentration of the reverse osmosis membrane was 5%, and the proportion of branched polyethyleneimine (branching degree was 60%) was 50%. The solution was covered for 12 hours, and light-shielding treatment was carried out during the process. Afterwards, the waste liquid was poured out, and the membrane was washed twice with deionized water to...

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Abstract

The invention relates to a hydrophilic polyamide reverse osmosis membrane with a compact surface as well as a preparation method and application thereof. Specifically, the invention relates to a hydrophilic polyamide reverse osmosis membrane with a compact surface, comprising a polyamide base membrane and a crosslinked polyethyleneimine layer grafted to the polyamide base membrane, wherein the crosslinked polyethyleneimine layer is formed from a polyethyleneimine blend comprising branched polyethyleneimine, and the degree of branching of the branched polyethyleneimine is between 55% and 65%. The invention also relates to the preparation method of the reverse osmosis membrane and application of the reverse osmosis membrane in separating boric acid from liquid effluent of a nuclear power plant.

Description

technical field [0001] The invention relates to a reverse osmosis membrane, more specifically, the invention relates to a surface-dense hydrophilic polyamide reverse osmosis membrane and a preparation method thereof. The invention also relates to using the reverse osmosis membrane to separate boric acid in the liquid effluent of a nuclear power plant and a membrane system containing the reverse osmosis membrane. The invention belongs to the technical field of material preparation and radioactive waste liquid treatment. Background technique [0002] As we all know, under the normal operation and accident conditions of traditional pressurized water reactors, a large amount of radioactive liquid containing boric acid will be discharged from the primary circuit and some auxiliary systems, and the boron in the coolant effluent is basically discharged into the environmental receiving water body of the plant site. The average concentration of boron in the liquid effluent of nuclea...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D71/56B01D61/02B01D67/00C02F1/44G21F9/06C02F101/10
CPCB01D69/02B01D71/56B01D61/025B01D67/0093C02F1/441G21F9/06B01D2325/36C02F2101/006C02F2101/108
Inventor 陈博贤赵璇陈定
Owner TSINGHUA UNIV
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