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A kind of polyamide nanofiltration membrane containing zwitterions and preparation method thereof

A zwitterion and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve low production cost, excellent performance, and good industrial applicability

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, according to the existing reports, these modified materials can rarely play the role of improving the permeation flux and fouling resistance of polyamide nanofiltration membranes at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] A polyamide nanofiltration membrane containing zwitterions and a preparation method thereof comprise the following steps:

[0015] 1) The substance containing tertiary amine group and the substance containing sultone group with a molar ratio of 1 to 1.5 are respectively dissolved in an organic solvent; at 30 to 40 o C, drop the solution containing the sultone group substance into the solution containing the tertiary amine group substance, react for 4 to 6 hours, and then at 0 to 5 o C is reacted for 48 to 72 hours, precipitated with an organic solvent, washed, and dried to obtain a zwitterionic monomer;

[0016] 2) Immerse the porous polysulfone support membrane in the aqueous solution for 2 to 5 minutes, the concentration of the polyamine monomer in the aqueous solution is 0.2 to 2wt / v %, and the concentration of the zwitterionic monomer is 0.05 to 0.5 wt / v %, the concentration of NaOH is 0.01-0.5 wt / v %, take out and remove the excess aqueous phase solution on the su...

Embodiment 1

[0020] N-aminoethylpiperazine and 1,3-propane sultone are respectively dissolved in acetone at a molar mass ratio of 1; at a temperature of 30 o C, the above-mentioned 1,3-propane sultone solution was added dropwise to the solution of N-aminoethylpiperazine, reacted for 6 hours, and then at 0 o React at a temperature of C for 72 hours, precipitate with acetone, wash, and dry to obtain a zwitterionic monomer; the porous polysulfone support membrane is immersed in a solution containing 0.2 wt / v % piperazine and 0.05 wt / v % of the zwitterionic monomer prepared above. body and 0.01 wt / v % NaOH aqueous phase solution, soak for 2 minutes, take out and remove the excess solution on the surface; then immerse it in n-hexane solution containing 0.1 wt / v % trimesoyl chloride, interfacial polymerization React for 0.5 minutes at 40 o C for 40 minutes, and after rinsing with deionized water, a polyamide nanofiltration membrane containing zwitterions was obtained.

[0021] Polyamide nanofi...

Embodiment 2

[0023]N-aminoethylpiperazine and 1,3-propane sultone are respectively dissolved in acetone at a molar mass ratio of 1.5; at a temperature of 40 o C, the solution of the above-mentioned 1,3-propane sultone was added dropwise to the solution of N-aminoethylpiperazine, reacted for 4 hours, and then in 5 o React at a temperature of C for 48 hours, precipitate with acetone, wash, and dry to obtain a zwitterionic monomer; the porous polysulfone support membrane is immersed in a solution containing 2 wt / v % piperazine, 0.5 wt / v % zwitterionic monomer prepared above and 0.5 wt / v % NaOH aqueous phase solution, soak for 5 minutes, take out and remove the excess solution on the surface; then immerse it in n-hexane solution containing 0.5 wt / v % trimesoyl chloride, interfacial polymerization reaction 3 minutes at 70 o C for 20 minutes, and after rinsing with deionized water, a polyamide nanofiltration membrane containing zwitterions was obtained.

[0024] Polyamide nanofiltration membra...

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Abstract

The invention discloses a polyamide nano filter membrane containing zwitterions and a preparation method thereof. The polyamide nano filter membrane containing the zwitterions comprises a porous polysulfone supporting player and a polyamide functional layer containing the zwitterions, and is prepared by carrying out interfacial polycondensation to the mixed water solution of polyamine and a zwitterionic monomer and the organic solution of multielement acyl chloride. Under the operation pressure of 0.6MPa, the nano filter membrane prepared by the method has high water flux (35-50L.m<-2>.h<-1>), and simultaneously, has very high trapping rate of 90-98% to divalent salt ions, and has lower trapping rate of less than 40% to univalent salt ions, in addition, the nano filter membrane has good stain resistance under the long-term operation. Thus, the prepared polyamide nano filter membrane containing the zwitterions has high permeability and stain resistance, the preparation method is simpleand easy to implement, the cost is low, and the industrial application prospect is good.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane separation, in particular to a polyamide nanofiltration membrane containing zwitterions and a preparation method thereof. Background technique [0002] As a new type of separation technology, membrane separation has the advantages of low energy consumption, high separation efficiency, and environmental protection compared with traditional separation technologies such as distillation and rectification. Nanofiltration membrane separation technology is a new type of pressure-driven membrane separation technology between ultrafiltration and reverse osmosis membrane separation technology. Nanofiltration membranes mainly separate dissolved components through steric hindrance and electrostatic repulsion. Its rejection rate for divalent or multivalent ions and organic molecules with a molecular weight greater than 200 is generally greater than 90%, while the rejection rate for monovalent ions and l...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/82B01D67/00
Inventor 安全福孙文丹计艳丽赵强高从堦
Owner ZHEJIANG UNIV
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