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Tubular nanofiltration membrane with multi-layer structure and preparation method thereof

A multi-layer structure and nanofiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of poor mechanical properties of tubular nanofiltration membranes without specifying the reinforcement composition and reinforcement method , Interlayer connections are not firm, etc., to achieve the effect of improving pollution resistance, structural stability, and hindering adsorption

Active Publication Date: 2012-10-03
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main problems existing in the current tubular nanofiltration membranes are: firstly, the strength of the tubular nanofiltration membranes. breakage of the hollow fiber
Secondly, in the preparation of composite nanofiltration membranes, hydrophobic polymers are usually used as base membrane materials. Such hydrophobic polymers usually have the advantages of good acid and alkali resistance and high mechanical strength, but due to the The separation layer of the membrane is usually a hydrophilic polymer, how to strengthen the bonding strength between the hydrophobic base membrane and the hydrophilic separation layer is also an important issue
[0005] Chinese patent CN101227968A reports the use of reinforcements to enhance the strength of hollow fiber nanofiltration membranes, but does not specify the composition and reinforcement methods of reinforcements, indicating that the use of reinforcements is only a rough concept, and reinforcements The connection between the polymer resin film and the polymer resin film and the polyamide active layer is completed by intermolecular interaction, and the interlayer connection is not strong
Chinese patent CN102139187A has reported the preparation method of ultrafiltration membrane or nanofiltration membrane of multi-layer composite structure, but it also involves between the non-woven support layer and the nanofiber membrane layer and between the nanofiber membrane layer and the ultrathin separation layer. It is not connected by chemical bonds, the interlayer bonding is weak, and it does not explain how to strengthen the strength of the film

Method used

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  • Tubular nanofiltration membrane with multi-layer structure and preparation method thereof
  • Tubular nanofiltration membrane with multi-layer structure and preparation method thereof
  • Tubular nanofiltration membrane with multi-layer structure and preparation method thereof

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preparation example Construction

[0070] The preparation method of the multi-layer structure tubular nanofiltration membrane comprises the following steps:

[0071] 1. Put the polymer fiber braided tube at 0.5~5.0mol·L -1 Soak in sodium hydroxide or potassium hydroxide solution for 5~20 minutes for alkali treatment, take out and wash with water, and then pass 0.1~5mol·L -1 The sulfuric acid or hydrochloric acid solution was soaked for 5 to 20 minutes for acid treatment, and washed with water to obtain a carboxyl-containing polymer fiber braided tube;

[0072] 2. Immerse the carboxyl-containing polymer fiber braided tube in the dipping solution for 1 to 10 seconds, take out and heat treatment at 40 to 60 ° C for 10 to 40 seconds, and then immerse it in water at 20 to 40 ° C for 5 to 30 seconds. Then heat treatment at 60-80° C. for 0.5-4 hours, so that the inorganic matter is filled into the carboxyl-containing polymer fiber braided tube, and the microfiltration support tube 1 is obtained.

[0073] 3. The m...

Embodiment 1

[0095] 1. Preparation of Microfiltration Support Tube 1

[0096] 1.1 Carboxylation treatment of polymer fiber braided tube: The polyethylene terephthalate polymer fiber braided tube with an outer diameter of 1.0 mm and a wall thickness of 0.3 mm is placed in a 0.5 mol·L -1 Soak in the sodium hydroxide solution for 20 minutes for alkali treatment, take out and wash with water, and then add 0.1 mol L -1 Soak in the sulfuric acid solution for 20 minutes for acid treatment, take out the water for cleaning, and air dry to obtain a carboxyl-containing polymer fiber braided tube;

[0097] 1.2 Inorganic filling of polymer fiber braided tube: Dissolve 5g of methyl orthosilicate in 95g of ethanol to prepare an impregnation solution, and then immerse the carboxyl group-containing polymer fiber braided tube in the impregnation solution for 10 seconds and take it out. Heat treatment at 40 ° C for 40 seconds, then immerse in water at 20 ° C for 30 seconds and take out, then heat treatment ...

Embodiment 2

[0114] 1. Preparation of Microfiltration Support Tube 1

[0115] 1.1 Carboxylation treatment of polymer fiber braided tube: The poly(paraphenylene terephthalamide) polymer fiber braided tube with an outer diameter of 2.0 mm and a wall thickness of 0.6 mm is placed in a 5.0 mol·L -1 Soak in the sodium hydroxide solution for 5 minutes for alkali treatment, take out and wash with water, and then add in 5.0mol·L -1 Soak in the hydrochloric acid solution for 5 minutes for acid treatment, take it out for washing with water, and air dry to obtain a carboxyl-containing polymer fiber braided tube;

[0116] 1.2 Inorganic filling of polymer fiber braided tube: Dissolve 50 g of methyl orthosilicate in 50 g of ethanol to prepare an impregnation solution, and then immerse the carboxyl group-containing polymer fiber braided tube in the impregnating solution for 1 second and then take it out. Heat treatment at 60 ° C for 10 seconds, then immersed in water at 40 ° C for 5 seconds and then tak...

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Abstract

The invention relates to a tubular nanofiltration membrane with a multi-layer structure and a preparation method thereof. The tubular nanofiltration membrane with the multi-layer structure is four-layered, and the four layers comprises a first layer, a second layer, a third layer and a fourth layer from inside to outside in sequence, wherein the first layer is a microfiltration supporting tube made from a carboxyl-contained fiber knitting tube which is filled with inorganic minerals; the second layer is a ultrafiltration layer formed by coating carboxyl-contained polymer on the outer surface of the first layer; the third layer is a nanofiltration layer made of polyamide formed by interfacial polymerization; and the fourth layer is a water loving layer forming covalent binding with the third layer. The tubular nanofiltration membrane with the multi-layer structure is obtained through the steps of forming functional layers from indie to outside in sequence, and stable chemical binding is formed among layers, so that the tubular nanofiltration membrane has excellent resistance to pressure and mechanical strength, and good water loving property, water permeability and antifouling ability; and moreover, the flux reaches more than 30 L / m<2>h, the removal rate of singlevalent salt is more than 30%, and the removal rate of bivalent salt is more than 95%.

Description

technical field [0001] The invention belongs to the technical field of membranes, and particularly relates to a multi-layer structure tubular nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a new and efficient separation technology, which has been widely used in many fields. Separation membrane is the material basis and core component of membrane separation technology, of which polymer organic membrane materials account for the main part. At present, the widely used organic membrane materials include polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF), polyethersulfone (PES), polysulfone (PSF) and so on. Nanofiltration is a new type of membrane separation technology developed in the late 1980s between reverse osmosis and ultrafiltration. filter. Nanofiltration membrane separation is carried out at room temperature, with no phase change, no chemical reaction, and no damage to biolog...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/56B01D71/38B01D71/68B01D71/30B01D71/34B01D71/42B01D67/00
Inventor 朱宝库刘卫东陈良刚肖玲王具备王俊朱利平
Owner ZHEJIANG UNIV
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