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A kind of high permeability nanofiltration membrane containing zwitterion and preparation method thereof

A zwitterionic, high-permeability technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as poor solubility, achieve low cost, simple membrane manufacturing process, and stable separation performance

Active Publication Date: 2011-12-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported polymer materials containing zwitterions have poor solubility in water, and it is difficult to prepare nanofiltration membranes by simple methods.

Method used

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  • A kind of high permeability nanofiltration membrane containing zwitterion and preparation method thereof

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preparation example Construction

[0015] The steps of the preparation method of the high-permeability nanofiltration membrane containing zwitterions are as follows:

[0016] 1) Add 2 to 5 parts by mass of monomers containing quaternary amino groups, 1 part by mass of hydroxyalkyl acrylate monomers and 0.06 to 0.6 parts by mass of zwitterionic monomers into water to make a mass percent concentration of 10 to 30% aqueous solution, feed nitrogen, add a water-soluble oxidation-reduction initiator with a concentration of 1 to 3% by mass, at 35 to 50 o Solution polymerization is carried out at C, the polymerization time is 8 to 24 hours, the polymer is precipitated with acetone, and after repeated washing, a terpolymer containing zwitterions is obtained, which is dried in vacuum and used for later use;

[0017] 2) Dissolve 1-2.5 parts by mass of the above-mentioned zwitterion-containing terpolymer and 0.1-0.45 parts by mass of polyaldehyde in water, then add sulfuric acid to adjust the pH of the solution to 2-4,...

Embodiment 1

[0021] 2 parts by mass of methacryloyloxyethyltrimethylammonium chloride, 1 part by mass of hydroxyethyl acrylate and 0.06 parts by mass of 3-[N,N-dimethyl-[2-(2-methyl Prop-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt is added in water to form an aqueous solution with a mass percent concentration of 10wt%, and nitrogen gas is fed into it, and a mass percent concentration of 1wt% water-soluble Sexual oxidation-reduction 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 several times of washing, a terpolymer containing zwitterions was obtained, which was dried in vacuum and used for later use; 1 mass The copolymer of 0.1 part by mass and the glutaraldehyde of 0.1 mass part join in water, add sulfuric acid again, adjust solution pH value to be 2; Stir evenly at room temperature, obtain clear and transparent aqueous solution; oU...

Embodiment 2

[0023] 5 parts by mass of methacryloxyethyltrimethylammonium chloride, 1 part by mass of hydroxyethyl acrylate and 0.6 parts by mass of 3-[N,N-dimethyl-[2-(2-methyl Propane-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt is added in water to form an aqueous solution with a mass percent concentration of 30wt%, and nitrogen gas is fed into it, and a mass percent concentration of 3wt% is added. Sexual oxidation-reduction 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 terpolymer containing zwitterions was obtained, which was dried in vacuum and used for later use; 2.5 mass The copolymer of 0.45 parts by mass and the glutaraldehyde of 0.45 parts by mass join in water, add sulfuric acid again, adjust the solution pH value to be 4; Stir evenly at room temperature, obtain clear and transparent aqueous solution; o Unde...

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Abstract

The invention discloses a high permeability nanofiltration membrane containing zwitterion and a preparation method. The nanofiltration membrane is composed of a polysulfones supporting layer and a functional layer containing a terpolymer of zwitterion group; the preparation process comprises the following steps: acquiring the water-soluble terpolymer through free radical copolymerization reactioncontaining zwitterion, preparing the copolymer and a cross-linking agent to an aqueous solution with a certain concentration, dipping one layer of the aqueous solution on the surface of the polysulfones supporting layer, then solidifying to obtain the membrane. The water flux of the nanofiltration membrane containing zwitterion is 30-45L.m-2.h-1 under the operation pressure of 0.6 MPa, and the nanofiltration membrane has high retention rate to bivalent ions with the highest of 97.5%, the retention rate to the monovalent cation is lower than 60%. The prepared nanofiltration membrane containingzwitterion has high permeability and stain resistane, the method for preparing the membrane is simple and easy which has low cost, and has good industrialization application prospect.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane separation, in particular to a zwitterion-containing high-permeability 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 pressure-driven membrane separation process between ultrafiltration and reverse osmosis, has become a hot spot in membrane separation technology research. Nanofiltration membranes are generally charged membranes, which can separate inorganic salts of different valence states and various organic substances through the dual effects of pore size sieving and electrostatic repulsion. Its rejection rate for monovalent ions is generally lower than 50%, but its rejection rate for divalent or multiva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D71/82B01D67/00
Inventor 安全福计艳丽高从堦
Owner ZHEJIANG UNIV
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