Preparation method of composite nanofiltration membrane

A composite nanofiltration membrane and technology of preparation steps, applied in the field of membrane treatment, can solve problems such as membrane loss of performance, and achieve the effect of improving the retention rate

Active Publication Date: 2015-05-06
北京碧水源分离膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If polyvinyl alcohol is directly coated on the base membrane of the nanofiltration membrane, the molecular chains between the two are only comb...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 2wt% polyvinyl alcohol Selvol 540 into water while stirring, adjust the heating temperature to 80°C, add 0.2wt% sulfuric acid after cooling, mix with the prepared 0.2wt% glutaraldehyde aqueous solution and put it into a small slit extrusion Out of the feed tank of the coating machine, the wetted polysulfone base film is placed on the coating machine (the coating machine adopts the FA-202D of Shanghai Fuan Co., Ltd.), and the control coating machine mixes polyvinyl alcohol and binary The mixed solution of aldehyde is evenly coated on the polysulfone-based membrane with a molecular weight cut-off of 40,000 to 60,000 and left to stand for 2 minutes; then the composite membrane is treated at 60-80°C for 3-5 minutes to form a polyvinyl alcohol nanofiltration membrane;

[0020] Then the composite membrane was placed in a heat treatment device at 60° C. for 3 minutes to obtain a polyvinyl alcohol nanofiltration membrane. The prepared nanofiltration membrane has a rejection...

Embodiment 2

[0022] Add 2wt% polyvinyl alcohol Selvol 540 into water while stirring, adjust the heating temperature to 80°C, add 0.4% sulfuric acid after cooling, mix it with the prepared 0.2wt% glutaraldehyde aqueous solution and put it into a small slit extrusion coating Put the wetted polysulfone-based membrane on the coating machine in the feed tank of the cloth machine, and control the coating machine to evenly coat the mixed solution of polyvinyl alcohol and dialdehyde on the polysulfone-based membrane and let it stand for 2 minutes;

[0023] Then the composite membrane was treated at 60° C. for 3 minutes to form the polyvinyl alcohol nanofiltration membrane. The prepared nanofiltration membrane has a rejection rate of 31% for 200ppm NaCl solution, a rejection rate of 94% for magnesium sulfate, and a rejection rate of 96.7% for PEG2000.

Embodiment 3

[0025] Add 4wt% polyvinyl alcohol Selvol 523 into water while stirring, adjust the heating temperature to 80°C, add 0.4wt% sulfuric acid after cooling, mix it with the prepared 0.2wt% glutaraldehyde aqueous solution and put it into a small slit extrusion In the feed liquid tank of the coater, place the wetted polysulfone base membrane on the coater, and control the coater to evenly coat the mixed solution of polyvinyl alcohol and dialdehyde on the polysulfone base membrane and let it stand for 2 minutes. and then place the composite membrane in a heat treatment device at 60° C. for 3 minutes to obtain a polyvinyl alcohol nanofiltration membrane. The prepared nanofiltration membrane has a rejection rate of 35% for 200ppm NaCl solution, a rejection rate of 93% for magnesium sulfate, and a rejection rate of 97.2% for PEG2000.

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PUM

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Abstract

The invention provides a preparation method of a composite nanofiltration membrane, wherein the method specifically includes the following steps: preparation of a polyvinyl alcohol solution; preparation of a cross-linking agent solution; and preparation of the composite nanofiltration membrane. The preparation method allows polyvinyl alcohol and glutaraldehyde to be crosslinked on a polysulfone-based membrane, the hydrophilicity of the membrane surface is improved, and the membrane is especially suitable for treatment of surface water, recycling of reclaimed water and preparation of high-quality drinking water.

Description

technical field [0001] The invention relates to membrane treatment technology, in particular to a preparation method of a composite nanofiltration membrane. Background technique [0002] Nanofiltration technology has become a key water purification technology because of its advantages of high efficiency, environmental protection, safety, energy saving, and easy operation, and is called "the water treatment technology of the 21st century". It operates at a lower pressure and has a certain degree of selective permeability for interception of substances in water. The composite nanofiltration membrane is to polymerize an ultra-thin and dense separation layer on the porous support layer. At present, the main and most widely used method for preparing nanofiltration membranes is interfacial polymerization, but interfacial polymerization has high requirements on the base membrane and other Process conditions such as temperature and humidity, rinsing liquid and rinsing temperature a...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D71/68B01D67/00B01D69/12C02F1/44
Inventor 陈亦力夏建中李伟林勇李锁定彭鹏王迪
Owner 北京碧水源分离膜科技有限公司
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