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High-throughput multilayer composite nano-filtration membrane and preparation method thereof

A multi-layer composite, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low water flux, damage, and uneven surface of porous support membranes. To achieve the effect of less defects and less damage

Inactive Publication Date: 2016-10-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water flux and desalination rate of the composite membrane are improved, but due to the uneven surface of the porous support membrane, the mechanical strength of the polymer functional skin layer prepared by interfacial polymerization is not high, and it is easy to be damaged during operation.
[0004] At the same time, in the field of composite nanofiltration membranes, the water flux of nanofiltration membranes is relatively low. How to improve the water flux of nanofiltration membranes is still a major problem in this field.
In the process of nanofiltration membrane water treatment, low water flux often causes problems such as high energy consumption and high operating costs. One of the research focuses of membrane preparation

Method used

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  • High-throughput multilayer composite nano-filtration membrane and preparation method thereof
  • High-throughput multilayer composite nano-filtration membrane and preparation method thereof
  • High-throughput multilayer composite nano-filtration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Get 2g of microcrystalline cellulose and place it in a container, add 20mL of sulfuric acid aqueous solution with a mass concentration of 64% dropwise into the microcrystalline cellulose, keep the temperature of the mixture at 0°C in an ice bath, and cool the mixture with a constant temperature water bath after the addition is completed. The temperature was raised to 45°C, and the reaction was stirred for 4h.

[0043]The above reacted mixture is slowly poured into ten times the volume of ultrapure water for dilution, and centrifuged and washed three times. The obtained product is dialyzed through a dialysis bag until the solution is neutral, and finally freeze-dried to obtain nanocrystalline cellulose powder.

[0044] The nanoscale cellulose powder was dispersed in water and ultrasonically dispersed for 2 h to obtain a 0.08 g / L nanocrystalline cellulose suspension.

[0045] Lay the polysulfone ultrafiltration membrane on the Buchner funnel, pour 10mL of nanocrystalline ...

Embodiment 2～4

[0048] Adjust the concentration of the water phase monomer piperazine and the oil phase monomer trimesoyl chloride, and the rest of the conditions are the same as in Example 1.

Embodiment 5～8

[0052] By adjusting the amount of nanocrystalline cellulose suspension used in the suction filtration process to adjust the loading capacity of nanocrystalline cellulose on the surface of the porous membrane, the concentration of piperazine in the aqueous phase solution is 0.3g / L, and the concentration of trimesoyl chloride in the oil phase solution Be 0.3g / L, all the other conditions are with embodiment 1.

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Abstract

The invention discloses a high-throughput multilayer composite nano-filtration membrane and a preparation method thereof. The high-throughput multilayer composite nano-filtration membrane is obtained by loading a nanocrystalline cellulose support layer on a porous support membrane and forming a layer of polymer functional cortex on the nanocrystalline cellulose support layer through the interfacial polymerization of water-phase monomer and oil-phase monomer. Due to the fact that nanocrystalline cellulose has high hydrophilicity, the prepared multilayer composite nano-filtration membrane has the feature of high throughput. By the nanocrystalline support layer, the surface of the porous support membrane is flat, and the defects of the functional cortex of the prepared multilayer composite nano-filtration membrane are few. The macroporous structure on the surface of the porous support membrane is replaced by the nanocrystalline cellulose support layer, so that the pressure of the cortex of the composite nano-filtration membrane is dispersed under filtration operations, and structural damage cannot occur easily.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a high-flux multilayer composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a new type of membrane separation technology, and the pore size of the nanofiltration membrane is in the range of nanometers. The composite nanofiltration membrane is mainly composed of three parts: a separation layer, a support layer and a base membrane, and the separation layer is a functional layer that plays a role in separation. Composite nanofiltration membranes can be used in water softening, food processing, dye removal, wastewater treatment and other fields. They have broad application prospects and have attracted extensive attention from membrane material manufacturers and research institutions. [0003] The Chinese patent document with the publication number CN102890315A discloses carbon nanotube-polymer composite nanofiltration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D67/00
CPCB01D69/125B01D67/0002B01D67/0006B01D69/10B01D69/105
Inventor 徐志康林福文王静静郭毅吴铭榜杨皓程
Owner ZHEJIANG UNIV
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