Preparation method of nanofiltration membrane with adjustable desalination rate

A technology of nanofiltration membrane and desalination rate, applied in the field of preparation of nanofiltration membrane, can solve the problems of poor precision, low adjustable range of flux and retention rate, poor universality, etc., and achieves simple operation, easy operation, and industrialization. production effect

Active Publication Date: 2021-06-01
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the currently prepared nanofiltration membranes generally have a fixed flux and rejection rate, which cannot meet the special needs of different application scenarios or regions. Therefore, it is urgent to develop a nanofiltration membrane with adjustable flux and rejection rate to meet market demand.
[0004] At present, the nanofiltration membrane with adjustable flux/rejection rate is mainly prepared in the following ways: 1. The interfacial polymerization process is affected by regulating the surface pore size and surface porosity of the porous support layer. The advantage of this method is that the formed nanofiltration membrane is stable. The disadvantage is that if you want to obtain a nanofiltration membrane with a specific

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mix the crosslinking agent N,N-methylene bisacrylamide, the surfactant dodecyltrimethylammonium chloride and deionized water according to the molar percentage of 1.35:0.2:100 to prepare the solution and add it to the three-necked flask , heated to 40-45°C and stirred and dissolved under the protection of nitrogen; then stopped stirring, added 13.5 parts of NVCL (vinyl caprolactam), raised the temperature to 75°C, and then added 0.015 molar amount of initiator 2,2'- Azobisisobutylamidine dihydrochloride, start stirring, react at 75°C for 4 hours under the protection of nitrogen, obtain PNVCL gel suspension, repeatedly centrifuge and disperse to remove residual unreacted components, freeze-dry to obtain polyPNVCL gel.

[0029] (2) Configure PNVCL gel: polyethylene glycol (molecular weight 2000): polyacrylonitrile polymer: N,N-dimethylformamide with a mass percentage of 1.5%: 5%: 18%: 75.5% cast film Liquid, stirred to disperse evenly, until completely dissolved, vacu...

Embodiment 2

[0033] (1) Mix the crosslinking agent N,N-methylene bisacrylamide, the surfactant dodecyltrimethylammonium chloride and deionized water according to the molar percentage of 1.35:0.2:100 to prepare the solution and add it to the three-necked flask , heated to 40-45°C and stirred and dissolved under the protection of nitrogen; then stopped stirring, added 13.5 parts of NVCL (vinyl caprolactam), raised the temperature to 75°C, and then added 0.015 molar amount of initiator 2,2'- Azobisisobutylamidine dihydrochloride, start stirring, react at 75°C for 4 hours under the protection of nitrogen, obtain PNVCL gel suspension, repeatedly centrifuge and disperse to remove residual unreacted components, freeze-dry to obtain polyPNVCL gel.

[0034] (2) Configure PNVCL gel: polyethylene glycol (molecular weight 2000): polyacrylonitrile polymer: N,N-dimethylformamide with a mass percentage of 1%: 7%: 20%: 72% cast film Liquid, stirred to disperse evenly, until completely dissolved, vacuumed...

Embodiment 3

[0038] (1) Mix the crosslinking agent N,N-methylene bisacrylamide, the surfactant dodecyltrimethylammonium chloride and deionized water according to the molar percentage of 1.35:0.2:100 to prepare the solution and add it to the three-necked flask , heated to 40-45°C and stirred and dissolved under the protection of nitrogen; then stopped stirring, added 13.5 parts of NVCL (vinyl caprolactam), raised the temperature to 75°C, and then added 0.015 molar amount of initiator 2,2'- Azobisisobutylamidine dihydrochloride, start stirring, react at 75°C for 4 hours under the protection of nitrogen, obtain PNVCL gel suspension, repeatedly centrifuge and disperse to remove residual unreacted components, freeze-dry to obtain polyPNVCL gel.

[0039] (2) Configuration of PNVCL gel: polyethylene glycol (molecular weight 2000): polyacrylonitrile polymer: N,N-dimethylformamide with a mass percentage of 1%: 9%: 25%: 65% cast film Liquid, stirred to disperse evenly, until completely dissolved, v...

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PUM

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Abstract

The invention relates to a preparation method of a nanofiltration membrane with an adjustable desalination rate. The preparation method is characterized by comprising the following steps: (1) preparing a membrane casting solution; (2) preparing a hollow fiber base membrane, namely metering the membrane casting solution and a core solution, pumping the membrane casting solution and the core solution into a spinning nozzle, extruding feed liquid from the spinning nozzle, enabling the extruded feed liquid to pass through an air gap and enter a coagulating bath, forming hollow membrane filaments through phase inversion in the coagulating bath, and winding the hollow membrane filaments for later use; and (3) preparing a hollow fiber nanofiltration composite membrane, namely soaking the wound membrane filaments with pure water, then soaking the membrane filaments in a water phase solution of polyamine, and carrying out polymerization reaction on an oil phase containing a polyacyl chloride monomer and a water phase monomer on the surface of the membrane on a coating machine to form a compact separation skin layer so as to finally obtain the nanofiltration membrane. Poly(N-vinylcaprolactam) gel is introduced in the preparation of the base membrane, so that the pore structure of the ultrafiltration base membrane can be adjusted through temperature, and the surface pore diameter of the base membrane and the interfacial polymerization reaction rate in the preparation process of the composite nanofiltration membrane can be adjusted and controlled while the water-phase temperature is realized.

Description

technical field [0001] The invention relates to a water filtration membrane, in particular to a preparation method of a nanofiltration membrane. Background technique [0002] Nanofiltration membrane is a new type of pressure-driven separation membrane whose separation scale is between ultrafiltration membrane and reverse osmosis membrane. Low, large flux and other advantages, widely used in food processing, purification of pharmaceutical intermediates and water treatment and other fields. It is usually divided into asymmetric nanofiltration membrane and composite nanofiltration membrane. The methods include phase inversion method, interfacial polymerization method, coating method, layer-by-layer self-assembly method, etc. At present, most commercial nanofiltration membranes are polyamide composite membrane structures. It is formed by interfacial polymerization of polyamines and polyacyl chlorides on a porous support layer. This type of composite membrane has good water per...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/08B01D69/12
CPCB01D67/0002B01D67/0006B01D69/12B01D69/125B01D69/08Y02A20/131
Inventor 李诗文胡帆林春儿刘戈陈承
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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