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Positively charged composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and positively charged technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult control of membrane structure and performance, complicated preparation steps, etc., and achieve low price and high preparation The effect of simple and safe process and good industrial applicability

Inactive Publication Date: 2011-09-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this method is used to prepare membranes, the preparation steps are relatively complicated, and the structure and performance of the membrane are difficult to control.

Method used

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  • Positively charged composite nanofiltration membrane and preparation method thereof
  • Positively charged composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 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, the polymerization time was 24 hours, the polymer was precipitated with acetone, and after repeated washing, a cationic copolymer was obtained, which was dried in vacuo for subsequent use; 1 mass part of the copolymer and 0.1 parts by mass of glutaraldehyde were added to water, and sulfuric acid was added to adjust the pH of the solution to be 2; stirred at a temperature of 20°C for 3 hours, and left to stand for 8 hours to obtain a uniform and transparent solution; at a temperature of 20°C and Under the condition of 50% air relative humidity, the above solution is evenly coated on the polysulfone ultrafiltratio...

Embodiment 2

[0019] 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 50°C, the polymerization time was 8 hours, the polymer was precipitated with acetone, and after repeated washing, a cationic copolymer was obtained, which was dried in vacuum and set aside; 2.5 parts by mass of the copolymer and 0.45 parts by mass of glutaraldehyde were added to water, and sulfuric acid was added to adjust the pH of the solution to be 4; stirred at a temperature of 30°C for 3 hours, and left to stand for 12 hours to obtain a uniform and transparent solution; at a temperature of 30°C and Under the condition of 60% relative air humidity, the above solution is evenly coated on the polysulfone ultrafiltra...

Embodiment 3

[0021] 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 45°C, the polymerization time was 12 hours, the polymer was precipitated with acetone, and after repeated washing, a cationic copolymer was obtained, which was dried in vacuo for subsequent use; 1 mass part of the copolymer and 0.19 parts by mass of glutaraldehyde were added to water, and then hydrochloric acid was added to adjust the pH value of the solution to 3; stirred at a temperature of 25°C for 3 hours, and left to stand for 8 hours to obtain a uniform and transparent solution; at a temperature of 25°C and Under the condition of 55% relative air humidity, the above solution is evenly coated on the polysulfone u...

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Abstract

The invention discloses a positively charged composite nanofiltration membrane and a preparation method thereof. The positively charged composite nanofiltration membrane consists of a porous support layer and polymer containing two functional groups, namely cations and hydroxyl; and the preparation process comprises the following steps: firstly, obtaining the polymer through free radical copolymerization reaction; secondly, preparing the polymer and a crosslinking agent into aqueous solution with certain concentration; and thirdly, coating the aqueous solution on the support layer, and crosslinking to obtain the composite membrane. The nanofiltration membrane prepared by the method has water flux of between 15 and 30L.m-2.h-1 under the operating pressure of 0.6MPa, has high retention ratio of bivalent cations which can reach 94.3 percent maximally, and has the retention ratio of monovalent cations lower than 60 percent. The prepared positively charged composite nanofiltration membranehas good separation performance; and the method for preparing the membrane is simple and feasible, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane separation, and in particular relates to a positively charged composite nanofiltration membrane and a preparation method thereof. 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 speaking, nanofiltration membranes have a high rejection rate for multivalent salt ions and organic comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/40B01D69/10
Inventor 安全福计艳丽李峰陈欢林高从堦
Owner ZHEJIANG UNIV
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