Preparation method for heterocyclic amine composite nanofiltration membrane

A composite nanofiltration membrane and heterocyclic amine technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of piperazine water pollution, non-conformity, etc. Transient effects

Inactive Publication Date: 2010-04-21
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercial nanofiltration membrane is mainly prepared by interfacial polymerization of two monomers, piperazine and trimesoyl chloride. However, due to the strong alkalinity of piperazine and its long-term pollution effect on water bodies, it does not meet the requirements. National energy conservation and emission reduction, green chemical requirements

Method used

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  • Preparation method for heterocyclic amine composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using a polysulfone support membrane prepared by a DMAc solution containing 18% polysulfone, put it into a 1.2% aqueous solution of 4-aminopiperidine containing 0.05% sodium dodecylsulfonate for about two minutes (SDS), the mass concentration of sodium phosphate and sodium hydrogen phosphate mixture in 4-aminopiperidine aqueous solution is 0.3%, and the pH of 4-aminopiperidine aqueous solution is 10. After soaking in the 4-aminopiperidine solution, use a rubber roller to remove excess 4-aminopiperidine solution on the front and back sides. Then this support membrane was contacted with an organic solution containing 0.2% trimesoyl chloride for 30 seconds, and the organic solvent was trifluorotrichloroethane; an ultrathin polypiperidine amide layer was formed, and then the membrane was placed in a 60°C Keep it in a vacuum oven for 14 minutes to form polypiperidine amide composite nanofiltration

[0022] The initial performance of the membrane was tested under a pressure ...

Embodiment 2

[0025] Using a polysulfone support layer composed of 17% polysulfone in DMAc solution, put it into 1.5% 4-aminopiperidine aqueous solution containing 0.12% sodium dodecylsulfonate for about two minutes (SDS); the mass concentration of sodium phosphate and sodium hydrogen phosphate mixture in 4-aminopiperidine aqueous solution is 0.5%, and the pH of 4-aminopiperidine aqueous solution is 9. After soaking in the 4-aminopiperidine solution, use a rubber roller to remove excess solution on the front and back. Then this support membrane was contacted with an organic solution containing 0.4% trimesoyl chloride for 60 seconds, and the organic solvent was trifluorotrichloroethane; an ultrathin polypiperidine amide layer was formed, and then the membrane was placed in a 70°C Keep it in a vacuum oven for 12 minutes to form a polypiperidine amide composite nanofiltration membrane.

[0026] The initial performance of the membrane was tested under a pressure of 1 MPa with 2000 ppm Na2SO4 a...

Embodiment 3

[0029] Using a polysulfone support layer composed of 15% polysulfone in DMAc solution, put in 1.8% 4-aminopiperidine aqueous solution containing 0.2% sodium dodecylsulfonate for about four minutes (SDS); the mass concentration of sodium phosphate and sodium hydrogen phosphate mixture in 4-aminopiperidine aqueous solution is 0.8%, and the pH of 4-aminopiperidine aqueous solution is 11. After soaking in the 4-aminopiperidine aqueous solution, the excess solution on the front and back of the support membrane was removed with a rubber roller. Then this supporting membrane was contacted with an organic solution containing 0.4% trimesoyl chloride for 150 seconds, the organic solvent heptane; an ultrathin polypiperidine amide layer was formed through interfacial polymerization, and then the membrane was placed in a 75°C Keep it in a vacuum oven for 12 minutes to form a polypiperidine amide composite nanofiltration membrane.

[0030] With 2000ppm (one millionth of the mass concentrat...

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Abstract

The invention discloses a preparation method for a polymer composite membrane, in particular a preparation method for a polypiperidinyl amide nanofiltration membrane, which comprises the following steps of: firstly, preparing a polysulfone support membrane; secondly, putting the polysulfone support membrane into an aqueous solution of 4-aminopiperidine, wherein the aqueous solution of 4-aminopiperidine contains a mixture of a sodium phosphate and a dibastic sodium phosphate, which serves as an acid-acceptor, and the polysulfone support membrane soaked by the aqueous solution of 4-aminopiperidine is rolled by a rubber roll to remove the redundant aqueous solution of 4-aminopiperidine; thirdly, contacting the polysulfone support membrane with a trimesoyl chloride containing organic solution; and finally, putting the polysulfone membrane in a vacuum oven to dry, and washing the membrane with water to obtain the polypiperidinyl amide nanofiltration membrane. The preparation method has the advantages of good permselectivity for the removal rate of the sodium chloride and the sodium sulphate, and relatively high flux, and is widely applied to specialized separation fields.

Description

technical field [0001] The invention relates to a preparation method of a polymer composite membrane, in particular to a preparation method of a polypiperidine amide nanofiltration membrane. technical background [0002] Nanofiltration is a new type of membrane separation technology developed in recent years. The molecular weight cut-off range of nanofiltration membrane is between 200-2000Da. The separation principle can be explained by Donnan effect. Since most nanofiltration membranes are charged membranes, when the membrane containing charged groups is placed in a salt-containing solvent, the concentration of counter ions in the solution (the ions with the opposite charge to the fixed charge in the membrane) in the membrane greater than its concentration in the bulk solution, while the homonymous ion has a lower concentration in the membrane than its concentration in the bulk solution. The resulting Donnan potential difference prevents the diffusion of homonymous ions fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/68
Inventor 周勇李兆魁高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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