Chlorine-resistant composite reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane and chlorine-resistant technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as reverse osmosis membrane damage, achieve enhanced chlorine resistance, reduce orton rearrangement, and enhance densification sexual effect

Active Publication Date: 2021-08-27
中芯膜(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the reverse osmosis membrane is easily damaged by chlorine attack, the invention provides a chlorine-resistant composite reverse osmosis membrane and its preparation method

Method used

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  • Chlorine-resistant composite reverse osmosis membrane and preparation method thereof
  • Chlorine-resistant composite reverse osmosis membrane and preparation method thereof
  • Chlorine-resistant composite reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First, the plasma generated in the argon plasma generator was sprayed on the surface of the polysulfone ultrafiltration base membrane by a low-temperature plasma spray gun for 50 seconds, and then the polysulfone ultrafiltration base membrane was soaked in an aqueous solution of chlorosulfonic acid with a mass concentration of 1% for 5 minutes, and then the polysulfone ultrafiltration base membrane was soaked for 5 minutes. Soak the sulfone ultrafiltration base membrane in 0.1% 2,5-diaminotrifluorotoluene aqueous solution for 1 min, and dry to obtain the polysulfone ultrafiltration base membrane 1; immerse the polysulfone ultrafiltration base membrane 1 with a mass concentration of 0.05 % of trimesoyl chloride in n-heptane organic solution for 10s, to obtain the polysulfone ultrafiltration base membrane II; heat-treat the polysulfone ultrafiltration base membrane II in an oven at 100°C for 10 minutes to obtain a composite reverse osmosis membrane, Store it in deionized w...

Embodiment 2

[0034] First, the plasma generated in the argon plasma generator was sprayed on the surface of the polysulfone ultrafiltration base membrane by a low-temperature plasma spray gun for 60 seconds, and then the polysulfone ultrafiltration base membrane was soaked in an aqueous solution of chlorosulfonic acid with a mass concentration of 2% for 5 minutes, and then the polysulfone ultrafiltration base membrane was soaked for 5 minutes. Soak the sulfone ultrafiltration base membrane in 1% 2,5-diaminotrifluorotoluene aqueous solution for 1 min, and dry to obtain the polysulfone ultrafiltration base membrane 1; immerse the polysulfone ultrafiltration base membrane 1 with a mass concentration of 0.1 % of trimesoyl chloride in n-heptane organic solution for 30s, the polysulfone ultrafiltration base membrane II was obtained; the polysulfone ultrafiltration base membrane II was heat-treated in an oven at 110°C for 10 minutes to obtain a composite reverse osmosis membrane, Store it in deion...

Embodiment 3

[0036] First, the plasma generated in the argon plasma generator was sprayed on the surface of the polysulfone ultrafiltration base membrane by a low-temperature plasma spray gun for 60 seconds, and then the polysulfone ultrafiltration base membrane was soaked in an aqueous solution of chlorosulfonic acid with a mass concentration of 3% for 8 minutes, and then the polysulfone ultrafiltration base membrane was soaked for 8 minutes. The sulfone ultrafiltration base membrane was soaked in 2,5-diaminotrifluorotoluene aqueous solution with a mass concentration of 2.5% for 3 minutes, and dried to obtain a polysulfone ultrafiltration base membrane one; the polysulfone ultrafiltration base membrane one was immersed in a mass concentration of 0.15 % of trimesoyl chloride in n-heptane organic solution for 50s to obtain polysulfone ultrafiltration base membrane II; polysulfone ultrafiltration base membrane II was heat-treated in an oven at 110°C for 15 minutes to obtain a composite reverse...

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Abstract

The invention relates to the technical field of reverse osmosis membranes, and discloses a chlorine-resistant composite reverse osmosis membrane and a preparation method thereof. The preparation method comprises the following steps: (1) treating the surface of a polysulfone ultrafiltration base membrane by using argon plasma, then soaking the treated polysulfone ultrafiltration base membrane with an aqueous chlorosulfonic acid solution, then conducting soaking with a polyamine aqueous solution, and performing drying to obtain a polysulfone ultrafiltration base membrane I; (2) soaking the polysulfone ultrafiltration base membrane I in a polyacyl chloride organic solution to obtain a polysulfone ultrafiltration base membrane II; (3) carrying out heat treatment on the polysulfone ultrafiltration base membrane II to obtain a composite reverse osmosis membrane; (4) soaking the composite reverse osmosis membrane in a reduction solution formed by mixing a phosphoric acid solution and a formaldehyde solution for reduction treatment to obtain an amide N-hydroxymethylated polyamide membrane; and (5) placing the amide N-hydroxymethylated polyamide membrane in a glutaraldehyde solution for cross-linking treatment to obtain the chlorine-resistant composite reverse osmosis membrane. The chlorine resistance of the prepared chlorine-resistant composite reverse osmosis membrane is remarkably enhanced, the service life of the membrane is prolonged, economic cost is reduced, and the application range of the membrane in desalination is expanded.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a chlorine-resistant composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis is a pressure-driven membrane separation process. It has the advantages of high purification efficiency, low cost, and environmental protection. It is widely used in pure water preparation, drinking water purification, wastewater treatment, seawater and brackish water desalination, food and beverage, medical and pharmaceutical Petrochemical, landfill leachate, metal cutting waste liquid and other fields. [0003] Commercial reverse osmosis membranes have poor chlorine resistance. Chlorine can oxidize the membrane material, resulting in attenuation of membrane performance, shortening the service life of the membrane, increasing the frequency of membrane element replacement, and increasing economic costs. Typical composite revers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D61/02B01D71/56C02F1/44C02F103/08
CPCB01D67/0002B01D67/0006B01D67/0093B01D69/02B01D69/125B01D71/56B01D61/025C02F1/441C02F2103/08B01D2325/30B01D2325/36Y02A20/131
Inventor 王双许家旺王美
Owner 中芯膜(北京)科技有限公司
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