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Composite nanofiltration membrane and preparation method thereof

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

Active Publication Date: 2016-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a composite nanofiltration membrane and a preparation method thereof, as well as the composite nanofiltration membrane and the composite nanofiltration membrane prepared by the method, in order to overcome the defects of existing nanofiltration membranes with poor acid resistance and alkali resistance. Application of filter membrane in the field of water treatment

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

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preparation example Construction

[0044] The present invention also provides a kind of preparation method of composite nanofiltration membrane, and this method comprises the following steps:

[0045] (1) dissolving a hydroxyl-containing polymer and a silane coupling agent containing a structure shown in formula (I) in a solvent to prepare a coating solution;

[0046] (2) coating the coating solution on the support layer to form an initial film;

[0047] (3) immerse the supporting layer formed with the initial film in step (2) into a solution containing a crosslinking agent and a crosslinking catalyst to carry out a crosslinking reaction to obtain a crosslinked network structure comprising the supporting layer and the surface of the supporting layer Composite nanofiltration membrane;

[0048] Formula (I),

[0049] Wherein, Y is an alkenyl group or a carbon functional group, and the carbon functional group is a compound with Cl, NH 2 , epoxy, SH, N 3 , (meth)acryloyloxy or isocyanate-based hydrocarbon grou...

Embodiment 1

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

[0079] Dissolve 0.5g of polyvinyl alcohol (PVA) and 0.3g of γ-aminopropyltriethoxysilane (KH550) in 100g of deionized water, then add 1mol / L dilute hydrochloric acid dropwise under stirring to adjust the pH of the solution to 1. At room temperature, after stirring for 24 hours, filter to obtain a clear coating solution;

[0080] After coating the dilute coating solution evenly on the polysulfone bottom membrane, put it into an oven at 60°C and heat it for 30 minutes to ensure that the solvent is completely evaporated; , 10 g of formaldehyde and 15 g of sodium sulfate, heated at 60° C. for 30 min, took out the composite nanofiltration membrane, washed it with water, and soaked it in deionized water.

[0081] After soaking the obtained composite nanofiltration membrane in water for 24 hours, the water flux and desalination rate were...

Embodiment 2

[0086] This embodiment is used to illustrate the composite nanofiltration membrane provided by the present invention and its preparation method.

[0087] Dissolve 0.5g of polyvinyl alcohol (PVA) and 0.1g of γ-aminopropyltriethoxysilane (KH550) in 100g of deionized water, then add 1mol / L dilute hydrochloric acid dropwise under stirring to adjust the pH of the solution to 1. At room temperature, after stirring for 24 hours, filter to obtain a clear coating solution;

[0088] After coating the dilute coating solution evenly on the polysulfone bottom membrane, put it into an oven at 60°C and heat it for 30 minutes to ensure that the solvent is completely evaporated; , 10 g of formaldehyde and 15 g of sodium sulfate, heated at 60° C. for 30 min, took out the composite nanofiltration membrane, washed it with water, and soaked it in deionized water.

[0089] After soaking the obtained composite nanofiltration membrane in water for 24 hours, the water flux and desalination rate were...

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Abstract

The invention discloses a composite nanofiltration membrane, a preparation method thereof, and application of the composite nanofiltration membrane prepared by adopting the preparation method to the field of water treatment. The composite nanofiltration membrane comprises a supporting layer and a separating layer which are overlapped together, wherein the separating layer is a cross-linked net structure which is positioned on the surface of the supporting layer and formed through thermal crosslinking reaction of polymer containing hydroxyl and a silane coupling agent with a structure as shown in the formula (I) (shown in the description) through sol-gel; in the formula (I), Y is alkenyl or carbon functional group, the carbon functional group is alkyl carried with Cl, NH2, epoxy, SH, N3, (methyl) acrylyl or isocyanate group; X is one or more of Cl, OMe, OEt, OC2H4OCH3, OSiMe3 and OAc. According to the composite nanofiltration membrane and the preparation method thereof, provided by the invention, stable operation of the composite nanofiltration membrane in an aqueous solution with the PH of 0-14 is achieved, a higher salt removing rate and water permeability are achieved, higher acid and alkali resistance is further achieved; besides, the method is simple, and an industrial application prospect is further realized.

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 the nanofiltration membrane is in the range of several nanometers. 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 fresh water softening, seawater softening, drinking water purification, water quality improvement, oil-water separation, waste water treatment and recycling, as well as the classification, purification and concentration of chemical products such as dyes, antibiotics, polypeptides and polysaccharides. [0003] At present, most commercial nanofiltration membranes use polysulfone ultrafiltration membrane as the support layer, and the interfacial polymerization of polyamine aqueous phase and polyacyl chloride ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00C02F1/44
Inventor 张杨刘轶群潘国元严昊郭敏
Owner CHINA PETROLEUM & CHEM CORP
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