Method for preparing positively charged nanofiltration membranes

A nanofiltration membrane and positively charged technology, which is applied in the field of preparation of positively charged nanofiltration membranes, can solve the problems of unsuitable large-scale production and high manufacturing cost, and achieve good industrial applicability, low price, simple and safe preparation process Effect

Inactive Publication Date: 2010-07-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of surface radiation modification generally needs to be equipped with special radiation sou

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 2 parts by mass of N,N-dimethylaminoethyl methacrylate and 1 part by mass of hydroxyethyl acrylate to water to form an aqueous solution with a mass percent concentration of 10wt%, feed nitrogen gas, and add a mass percent concentration of 1 wt% of water-soluble redox initiator K 2 S 2 o 8 and NaHSO 3 (1:1), solution polymerization was carried out at 35°C, and when the polymerization time was 24 hours, the polymer was precipitated with acetone, and after repeated washing, the copolymer was obtained, which was dried in vacuo for later use; 0.5 parts by mass of the copolymer was added to dissolve in water Obtain the polymer aqueous solution, under the condition of the temperature of 20 ℃ and the air relative humidity of 55%, the polymer aqueous solution is evenly coated on the polysulfone ultrafiltration membrane, at the temperature of 50 ℃, dry for 20 minutes; In the acetone solution of epichlorohydrin, stand at 30° C. for 2 minutes to evaporate the acetone, and so...

Embodiment 2

[0016] Add 5 parts by mass of N,N-dimethylaminoethyl methacrylate and 1 part by mass of hydroxyethyl acrylate to water to form an aqueous solution with a mass percent concentration of 30wt%, feed nitrogen gas, and add a mass percent concentration of 3 wt% of water-soluble redox initiator K 2 S 2 o 8 and NaHSO 3 (1:1), solution polymerization was carried out at 45°C, the polymerization time was 8 o'clock, the polymer was precipitated with acetone, and after washing several times, the copolymer was obtained, which was dried in vacuum and set aside; 2 parts by mass of the copolymer were added to dissolve in water Obtain the polymer aqueous solution, under the temperature of 30 ℃ and the air relative humidity condition of 65%, the polymer aqueous solution is evenly coated on the polysulfone ultrafiltration membrane, at the temperature of 25 ℃, dry for 40 minutes; In the acetone solution of epichlorohydrin, stand at 25° C. for 5 minutes to evaporate the acetone, and solidify at ...

Embodiment 3

[0018] Add 3 parts by mass of N,N-dimethylaminoethyl methacrylate and 1 part by mass of hydroxyethyl acrylate to water to form an aqueous solution with a mass percent concentration of 15wt%, feed nitrogen gas, and add a mass percent concentration of 2 wt% of water-soluble redox initiator K 2 S 2 o 8 and NaHSO 3 (1:1), solution polymerization was carried out at 40°C, and when the polymerization time was 24, the polymer was precipitated with acetone, and after several times of washing, the copolymer was obtained, which was dried in vacuo for later use; 0.5 parts by mass of the copolymer was dissolved in water Obtain the polymer aqueous solution, under the temperature of 25 ℃ and the air relative humidity condition of 60%, the polymer aqueous solution is evenly coated on the polysulfone ultrafiltration membrane, at 25 ℃ temperature, dry for 40 minutes; In the n-hexane solution of trimesoyl chloride, let stand at 25° C. for 5 minutes, volatilize the n-hexane, solidify at 80° C....

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Abstract

The invention discloses a method for preparing positively charged nanofiltration membranes. The positively charged nanofiltration membranes are formed by porous support layers and functional layers which are formed by copolymers containing cations and hydroxy. The preparation process is as follows: firstly, obtaining functional copolymers through free radical copolymerization, preparing the copolymers into water solution with certain concentration, coating the prepared water solution on the support layers and drying the support layers; and secondly, immerging the support layers into solution containing cross-linking agents, and finally carrying out heating and curing to obtain the positively charged nanofiltration membranes. Under the operation pressure of 0.6MPa, the positively charged nanofiltration membranes have water flux of 12-18L/m<2>.h, show very high retention ratio which is generally 75-95% to bivalent cations and show retention ratio which is generally lower than 65% to monovalent cations. The prepared positively charged nanofiltration membranes have excellent separation property, and the method is simple and feasible, low in cost and easy for industrial production.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane separation, and in particular relates to a preparation method of a positively charged nanofiltration membrane. Background technique [0002] In recent years, membrane separation technology has developed rapidly in the field of material separation and purification by virtue of its advantages of energy saving, high efficiency and environmental protection. Among them, nanofiltration, as a new type of pressure-driven membrane separation process, has become a hot spot in the research of membrane separation technology. The pore size and molecular weight cut-off of the nanofiltration membrane are between the reverse osmosis membrane and the ultrafiltration membrane, and the separation of substances is mainly realized by pore size sieving and electrostatic repulsion. Generally, nanofiltration membranes have a high rejection rate for multivalent salt ions and organic substances with a molecular weig...

Claims

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Application Information

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IPC IPC(8): B01D69/12
Inventor 安全福计艳丽陈欢林高从堦
Owner ZHEJIANG UNIV
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