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Preparation method of anti-pollution composite membrane

A composite membrane and anti-pollution technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as inorganic salt scaling pollution, membrane cleaning flux recovery, organic pollution, etc., to improve anti-pollution Ability to improve cleaning recovery and enhance cleaning removal effect

Inactive Publication Date: 2022-07-22
天津海龙津阳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims at the problems of organic pollution, inorganic salt scaling pollution, biological growth pollution and membrane cleaning flux recovery of existing reverse osmosis and nanofiltration composite membranes, and provides a preparation method of anti-pollution composite membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] On the surface of a conventional polysulfone-based membrane, according to the conventional nanofiltration membrane interfacial polymerization preparation method, first dip-coating the piperazine aqueous solution with a concentration of 0.25 wt%, and then coating the n-hexane solution of trimesoyl chloride with a concentration of 0.15 wt%, After that, continue to sequentially coat the dioxane solution with a concentration of 2 wt% of triethylenetetramine for 60 seconds at room temperature, and then coat with an aqueous solution of itaconic acid with a concentration of 3 wt% at room temperature, keep and store for 30 hours, and prepare A composite nanofiltration membrane was obtained.

[0031]A mixed aqueous solution of 1 000 mg / L humic acid and saturated calcium carbonate was prepared, and the pH value of the mixed aqueous solution was adjusted to 7 with hydrochloric acid and sodium hydroxide solution as the membrane fouling test solution, and conventional nanofiltration ...

Embodiment 2

[0042] On the surface of a conventional polysulfone-based membrane, according to the conventional reverse osmosis membrane interfacial polymerization preparation method, firstly dip-coating an aqueous solution of m-phenylenediamine with a concentration of 0.25 wt%, and then coating with a concentration of 0.15 wt% of trimesoyl chloride n-hexane. solution, then continue to sequentially coat the chloroform solution of diethylenetriamine with a concentration of 2 wt% at room temperature for 2 minutes, and then coat with an aqueous solution of citric acid with a concentration of 3 wt% for 10 hours to prepare a composite reverse osmosis membrane.

[0043] Similarly, a mixed aqueous solution of 1000 mg / L humic acid and saturated calcium carbonate was prepared, and the pH value of the mixed aqueous solution was adjusted to 7 with hydrochloric acid and sodium hydroxide solution as the membrane fouling test solution. Under the pressure of 2.8 MPa, conventional reverse osmosis membrane f...

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Abstract

The invention belongs to the technical field of composite membrane preparation, and provides a preparation method of an anti-pollution composite membrane. After the interfacial polymerization reaction, acyl chloride groups remaining on the surface of the skin layer of the composite membrane continue to be subjected to HCl removal reaction with amino groups of polyamine, so that the surface of the skin layer of the composite membrane is subjected to polyamination and is positively charged, then part of amino groups on the surface and carboxyl groups of polybasic acid are subjected to dehydration condensation reaction, and the outermost surface of the membrane is negatively charged due to the carboxyl groups or sulfonic acid groups on the surface. Therefore, a protective layer with high charge property and double-pH cleaning responsiveness is formed on the surface of the skin layer of the composite membrane. During membrane filtration, the protective layer plays a role in pretreatment of an ultramicro filter membrane, so that the organic pollution of treated liquid to a nanofiltration membrane and a reverse osmosis membrane is reduced; when the membrane is chemically cleaned, a special polyamine and polyacid double-layer charged structure of the protective layer forms double-pH cleaning responsiveness, so that the cleaning and removing effects on intractable organic pollutants and inorganic pollutants on the surface of the membrane are enhanced, and the cleaning restorability of the membrane is further improved.

Description

technical field [0001] The invention belongs to the technical field of composite membrane preparation, in particular to a preparation method of an anti-pollution reverse osmosis composite membrane or a nanofiltration composite membrane. Background technique [0002] Membrane technology has been applied on a large scale due to its high separation efficiency and relatively simple operation process. In practical applications, membranes all face the common problem of membrane flux attenuation caused by membrane fouling. Reverse osmosis membranes and nanofiltration membranes have been widely used in water purification treatment, material separation and purification and concentration and other fields. Generally, the methods for preparing reverse osmosis membranes and nanofiltration membranes mainly include phase inversion method, surface coating method, layer-by-layer self-assembly method and interfacial polymerization method. Among them, the preparation method of the interfacial...

Claims

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Application Information

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IPC IPC(8): B01D71/76B01D71/68B01D69/12B01D69/10B01D61/02
CPCB01D71/68B01D71/76B01D69/125B01D69/10B01D61/025B01D61/027B01D2325/48
Inventor 吕剑阳
Owner 天津海龙津阳材料科技有限公司