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Antibacterial composite reverse osmosis membrane and preparation method thereof

A technology of reverse osmosis membrane and compound, applied in the field of membrane separation, can solve the problems of restricting the popularization and application of polyamide composite reverse osmosis membrane, increasing operating cost and energy consumption, reducing system production efficiency, etc., and achieving excellent anti-pollution performance and low cost , the effect of long service life

Inactive Publication Date: 2021-03-02
嘉兴市爵拓科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These have seriously restricted the popularization and application of polyamide composite reverse osmosis membranes, especially in the fields of highly polluted water treatment, water reuse, and chemical separation.
In addition, the problem of membrane fouling also limits its popularization and application, because membrane fouling will lead to a significant decrease in the permeation flux of the membrane, a decrease in the production efficiency of the system, an increase in operating costs and energy consumption, and it will also lead to frequent cleaning of the system and malfunction of the device. , The rejection rate characteristics of the membrane are seriously deteriorated, the water quality of the product water is deteriorated, the life of the membrane is reduced, and the membrane is frequently replaced

Method used

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  • Antibacterial composite reverse osmosis membrane and preparation method thereof
  • Antibacterial composite reverse osmosis membrane and preparation method thereof
  • Antibacterial composite reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] This embodiment provides an antibacterial composite reverse osmosis membrane, including a non-woven base layer, a porous support layer, and a separation layer;

[0096] The non-woven fabric base layer is polyester non-woven fabric, and its thickness is 120 μm;

[0097] The thickness of the porous support layer is 35 μm;

[0098] The separation layer has a thickness of 0.25 μm.

[0099] The present embodiment also provides a method for preparing an antibacterial composite reverse osmosis membrane, which specifically includes the following steps:

[0100] 1) Preparation of porous support layer:

[0101] 1.1) 10g of diallyl bisphenol sulfur, 15g of 4,4-dihydroxydiphenylsulfone, 25g of difluorodiphenylsulfone were added to 300g of N-methylpyrrolidone / toluene mixed solvent (mixing weight ratio 2.5:1), add 17.5g of anhydrous potassium carbonate, heat up to 160°C at a rate of 10°C / min, stir at 300r / min for 8h, after the reaction, pour the solution into deionized water, and ...

Embodiment 2

[0112] This example provides another antibacterial composite reverse osmosis membrane, and the preparation method is basically the same as that in Example 1, except that in this example, in step 3) of preparing the polyethersulfone / polyvinyl alcohol blend membrane, the The addition amount of the base polyvinyl alcohol is 1 g, that is, the added weight ratio of polyethersulfone and sulfhydryl polyvinyl alcohol is 1:0.1, and the graft ratio of the obtained polyethersulfone / polyvinyl alcohol graft copolymer is 16.7 %.

Embodiment 3

[0114] This example provides another antibacterial composite reverse osmosis membrane, and the preparation method is basically the same as that in Example 1, except that in this example, in step 3) of preparing the polyethersulfone / polyvinyl alcohol blend membrane, the The addition amount of the base polyvinyl alcohol is 2g, that is, the added weight ratio of polyether sulfone and sulfhydryl polyvinyl alcohol is 1:0.2, and the graft ratio of the obtained polyether sulfone / polyvinyl alcohol graft copolymer is 18.9 %.

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Abstract

The invention relates to the technical field of membrane separation, in particular to an antibacterial composite reverse osmosis membrane and a preparation method thereof. According to the invention,a porous supporting layer is prepared from a polyethersulfone / polyvinyl alcohol graft copolymer, a polyamide film is formed on the porous supporting layer and then subjected to aftertreatment, and theantibacterial composite reverse osmosis membrane is prepared; compared with the prior art, the composite reverse osmosis membrane has the advantages of excellent chlorine resistance, excellent pollution resistance, greatly prolonged service life, large water flux, high operation efficiency, high salt rejection rate and high antibacterial performance, and is suitable for large-scale popularizationand production.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to an antibacterial composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] In the 21st century, human beings are faced with severe problems of water pollution and shortage of freshwater resources. In order to solve these problems, membrane separation technology has received extensive attention. Membrane separation technologies include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, forward osmosis and reduced pressure osmosis, etc. Among them, reverse osmosis technology is simple in process, low in energy consumption, large in processing capacity and high in separation efficiency, so its application range is from the beginning. The desalination of seawater and brackish water has gradually expanded to many fields such as wastewater treatment, concentration and separation, ultrapure water preparation and drinki...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D69/10B01D69/12B01D67/00
CPCB01D61/025B01D67/0018B01D67/0093B01D69/10B01D69/105B01D69/12B01D2325/48
Inventor 不公告发明人
Owner 嘉兴市爵拓科技有限公司
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