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Composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and combined technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor acid resistance of nanofiltration membranes

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is in order to overcome the defect that existing nanofiltration membrane is poor in acid resistance, and provide a kind of composite nanofiltration membrane and preparation method thereof, and this composite nanofiltration membrane and the composite nanofiltration membrane prepared by this method are in water applications in the field of processing

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  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing the composite nanofiltration membrane, which includes the following steps:

[0035] (1) Dissolve the hydroxyl-containing polymer and the amino-containing silane coupling agent in a solvent to prepare a coating liquid;

[0036] (2) Coating the coating liquid on the support layer to form an initial film;

[0037] (3) Immerse the support layer formed with the initial membrane in step (2) in a solution containing a crosslinking agent and a crosslinking catalyst to perform a crosslinking reaction to obtain a crosslinked network structure including the support layer and the surface of the support layer Initial composite nanofiltration membrane;

[0038] (4) Post-processing the initial composite nanofiltration membrane with water and / or alcohol solution to obtain a modified composite nanofiltration membrane;

[0039] Wherein, the water and / or alcohol solution is an aqueous solution of formaldehyde and phosphorous acid, or an al...

Embodiment 1

[0070] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0071] Dissolve 1.0g polyvinyl alcohol (PVA) and 1.0g γ-aminopropyltriethoxysilane (KH550) in 100g deionized water, then add 1mol / L dilute hydrochloric acid dropwise with stirring to adjust the pH of the solution 1. After stirring for 24 hours at normal temperature, filter to obtain a clear coating liquid;

[0072] After the coating dilute solution is evenly coated on the polysulfone base membrane, it is then placed in an oven at 60°C and heated for 30 minutes to ensure that the solvent volatilizes completely; then the obtained initial composite nanofiltration membrane is soaked in 100g water and 10g concentrated In a solution of sulfuric acid, 10g formaldehyde and 15g sodium sulfate, heat at 60°C for 30 minutes, take out the initial composite nanofiltration membrane, wash it with water and soak it in deionized water for later use;

[00...

Embodiment 2

[0078] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0079] Dissolve 1.0 g PVA and 0.5 g γ-aminopropyltrimethoxysilane in 100 g deionized water, and then drop 1 mol / L dilute hydrochloric acid with stirring to adjust the pH of the solution to 4. After stirring for 24 hours at normal temperature, filter to obtain a clear coating liquid;

[0080] After the coating dilute solution is evenly coated on the polysulfone base membrane, it is then placed in an oven at 60°C and heated for 30 minutes to ensure that the solvent volatilizes completely; then the obtained initial composite nanofiltration membrane is soaked in 100g water and 10g concentrated In a solution of sulfuric acid, 10g formaldehyde and 15g sodium sulfate, heat at 60°C for 30 minutes, take out the initial composite nanofiltration membrane, wash it with water and soak it in deionized water for later use;

[0081] The obtained initial ...

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Abstract

The present invention discloses a composite nanofiltration membrane and a preparation method thereof and application of the composite nanofiltration membrane prepared by the preparation method in the field of water treatment. The composite nanofiltration membrane comprises a support layer and a separation layer which are stacked together, wherein the separation layer is obtained by forming of an initial composite nanofiltration membrane by sol-gel and thermal crosslinking reaction of a polymer containing a hydroxyl group and a silane coupling agent containing an amino group and then post-treatment by use of a water solution and / or an alcohol solution, and the water solution and / or the alcohol solution is a water solution of formaldehyde and phosphorous acid or an alcohol solution of formaldehyde and phosphite and perchlorate. The composite nanofiltration membrane may be stable to operate in a water solution of pH = 0, has a high salt removing rate and water permeability (water flux), also has strong acid resistance, is simple in preparation method, and has great prospects for industrial application.

Description

Technical field [0001] The invention relates to a composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The pore size of nanofiltration membranes is about a few nanometers. It has poor removal of monovalent ions and organic matter with a molecular weight of less than 200. Or multivalent ions and organic matter with a molecular weight between 200 and 500 have a higher removal rate. It can be widely used in the fields of freshwater softening, seawater softening, drinking water purification, water quality improvement, oil-water separation, wastewater treatment and recycling, and the classification, purification and concentration of chemical products such as dyes, antibiotics, peptides and polysaccharides. [0003] At present, most commercial nanofiltration membranes use polysulfone ultrafiltration membrane as a support layer, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/68B01D67/00
Inventor 张杨刘轶群潘国元严昊郭敏
Owner CHINA PETROLEUM & CHEM CORP
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