Compound nanofiltration membrane with vinylon water-soluble threads as (sacrifice) middle layer and preparing method thereof

A composite nanofiltration membrane and intermediate layer technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of cumbersome operation process and complicated preparation of nanoparticles, and achieve the increase of pure water permeation flux, The effect of improving permeability and reducing water transport resistance

Inactive Publication Date: 2019-11-05
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the nanoparticles used is complicated and the operation process is cumbersome.

Method used

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  • Compound nanofiltration membrane with vinylon water-soluble threads as (sacrifice) middle layer and preparing method thereof
  • Compound nanofiltration membrane with vinylon water-soluble threads as (sacrifice) middle layer and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Stir the vinylon aqueous solution with a concentration of 0.0625g / L in a high-speed dispersion mixer at 13000rpm for 1h, and stir for 30min under an ultrasonic cell pulverizer to obtain a uniformly dispersed solution;

[0037] (2) sandwich the membrane between the filter element and the filter cup of the suction filtration device, take 2mL of the solution containing vinylon hydrolyzate, and filter it onto the polysulfone base membrane to form a vinylon hydrolyzate layer;

[0038] (3) Dissolve piperazine with a concentration of 0.3w / v% in deionized water, pour it into a filter cup, soak for 5 minutes, and then apply pressure and filter to remove the aqueous phase monomer solution until there are no obvious drops of water on the surface;

[0039] (4) Dissolve trimesoyl chloride with a concentration of 0.15w / v% in cyclohexane to form an oil phase solution; immerse the film prepared above for interfacial polymerization reaction for 1 minute to obtain a composite membran...

Embodiment 2

[0043] It is basically the same as Example 1, except that the water-soluble line of vinylon filtered by suction is 4mL.

Embodiment 3

[0045] It is basically the same as Example 1, except that the water-soluble line of vinylon filtered by suction is 6mL.

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PUM

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Abstract

The invention relates to a compound nanofiltration membrane with vinylon water-soluble threads as a (sacrifice) middle layer and a preparing method thereof. The vinylon water-soluble threads are adopted as the middle layer / sacrifice middle layer. The compound nanofiltration membrane has a coarse ultra-thin separated surface layer and a nanopore middle layer and has excellent permeability and selectivity; the applied vinylon water-soluble threads are environmentally friendly and low in price, experimental operation is simple, reaction conditions are mild, and the compound nanofiltration membrane has broad production prospects.

Description

technical field [0001] The invention belongs to the field of composite nanofiltration membranes, in particular to a composite nanofiltration membrane using vinylon water-soluble thread as a (sacrificial) middle layer and a preparation method thereof. Background technique [0002] Nanofiltration membrane is a pressure-driven porous membrane between reverse osmosis and ultrafiltration. It has high rejection rate and fast permeability, and has broad application prospects in molecular separation and water purification, especially in the separation of small molecules. Thin-film composite membranes prepared by interfacial polymerization have attracted much attention due to their ultrathin layering. Typically, interfacial polymerization is divided into two steps: first, the porous support layer is impregnated with an aqueous solution of amine monomers; then, it is contacted with an organic solution containing acid chlorides. The surface properties and porous structure of the porou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D67/00
CPCB01D61/027B01D67/0083B01D69/10B01D69/125
Inventor 吴慧青王月武培怡
Owner DONGHUA UNIV
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