Preparation method of meta-aramid-based polyamide composite nanofiltration membrane

A composite nanofiltration membrane and polyamide-based technology, which is applied in the field of nanofiltration membrane materials to achieve high physical and chemical stability, scale-up and industrial application, and low production costs

Inactive Publication Date: 2020-12-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of polyamide composite nanofiltration membranes using meta-aramid porous membranes as base membranes.

Method used

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  • Preparation method of meta-aramid-based polyamide composite nanofiltration membrane
  • Preparation method of meta-aramid-based polyamide composite nanofiltration membrane
  • Preparation method of meta-aramid-based polyamide composite nanofiltration membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, a homogeneous solution containing 12.5wt.% meta-aramid, 1.5wt.% polyvinylpyrrolidone, 4.5wt.% lithium chloride, 3.0wt.% acetone, and 77.5wt.% dimethylacetamide was used as a film-making solution , the meta-aramid porous base membrane was prepared by phase inversion method.

[0027] Secondly, after immersing the prepared meta-aramid porous base membrane in a piperazine aqueous solution with a concentration of 1.5wt.% for 2min, take out the piperazine solution remaining on the surface with a rubber roller, and then immerse it at a concentration of 0.2% (w / v) In the trimesoyl chloride n-hexane solution, react for 20s, take out the membrane and transfer it to an oven at 70°C for heat treatment for 5min, and finally immerse the membrane in deionized water for rinsing to obtain a meta-aramid-based polyamide composite nanofiltration membrane .

[0028] The pure water flux of the membrane was measured with deionized water, and the rejection rate of monovalent salt and ...

Embodiment 2

[0032] Using the meta-aramid membrane in Example 1 as the base membrane, immerse the prepared meta-aramid porous base membrane in a piperazine aqueous solution with a concentration of 1.5wt.% for 2 minutes, then remove the residue on the surface with a rubber roller. Piperazine solution, then immersed in trimesoyl chloride n-hexane solution with a concentration of 0.1% (w / v), reacted for 30s, took out the membrane and transferred it to an oven at 80°C for heat treatment for 4min, and finally immersed the membrane in deionized water for rinsing , to obtain the meta-aramid-based polyamide composite nanofiltration membrane.

[0033] The pure water flux of the membrane was measured with deionized water, and the rejection rate of monovalent salt and divalent salt was measured with 2000mg / L magnesium sulfate and 2000mg / L sodium chloride solution. The operating pressure was 0.6MPa and the temperature was 25°C.

[0034] The test results are as follows:

[0035]

Embodiment 3

[0037] First, a homogeneous solution containing 15wt.% meta-aramid, 4.0wt.% polyethylene glycol, 5wt.% lithium chloride, 2.0wt.% acetone, and 74wt.% dimethylacetamide was used as a film-making solution. The meta-aramid porous base membrane was prepared by phase inversion method.

[0038] Secondly, after immersing the prepared meta-aramid porous base membrane in a piperazine aqueous solution with a concentration of 1.5wt.% for 3 minutes, take out the piperazine solution remaining on the surface with a rubber roller, and then immerse it at a concentration of 0.15% (w / v) In the trimesoyl chloride n-hexane solution, react for 40s, take out the membrane and transfer it to an oven at 80°C for heat treatment for 5min, and finally immerse the membrane in deionized water for rinsing to obtain a meta-aramid-based polyamide composite nanofiltration membrane .

[0039] The pure water flux of the membrane was measured with deionized water, and the rejection rate of monovalent salt and di...

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Abstract

The invention discloses a preparation method of a meta-aramid-based polyamide composite nanofiltration membrane. The preparation method comprises the following steps: dissolving 12 wt.%-20 wt.% of a meta-aramid polymer in a mixed solution of N,N-dimethylacetamide, an inorganic additive and an organic additive, coating a polyester non-woven fabric with the obtained solution, immersing the polyesternon-woven fabric in a coagulating bath, and preparing a meta-aramid porous base membrane by adopting a phase inversion method; immersing the meta-aramid porous base membrane into a polyamine solution, waiting for a period of time, taking out the membrane, and removing moisture on the surface of the membrane by using a rubber roller; immersing the membrane into a polyacyl chloride solution, carrying out an interfacial polymerization reaction, taking out the membrane, transferring the membrane into a drying oven, and carrying out heat treatment; and finally, taking out the membrane, immersing the membrane into deionized water, and conducting rinsing to obtain the polyamide composite nanofiltration membrane. The meta-aramid-based polyamide composite nanofiltration membrane has the advantagesof acid and alkali corrosion resistance, solvent resistance, long service life, simple process low production cost, pure water flux of 35 L.M<-2>.H<-1> under a transmembrane pressure difference of 0.5 MPa, a monovalent salt rejection rate of 30% or above, and a divalent salt rejection rate of 95% or above.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane materials, in particular to a method for preparing a meta-aramid-based polyamide composite nanofiltration membrane. Background technique [0002] As a kind of membrane separation technology, nanofiltration technology (Nanofiltration membrane, NF) is a pressure-driven membrane separation process between ultrafiltration and reverse osmosis. The membrane pore size is less than 2nm. According to the principle of electrostatic repulsion and pore size sieving , can separate inorganic salts of different valence states and organic compounds of different molecular weights. It has the advantages of low operating pressure, large flux, high efficiency, and easy operation. It is gradually replacing some traditional separation technologies with serious pollution, high energy consumption, and cumbersome processes. , has been gradually used in water softening, waste water treatment, food industry,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D67/00B01D69/12B01D71/56C08G69/26
CPCB01D61/027B01D67/0006B01D69/12B01D71/56B01D2325/24B01D2325/30C08G69/26
Inventor 王涛王亚君张璐瑶
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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