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Preparation method of nanofiltration membrane

A technology of nanofiltration membrane and support membrane, which is applied in the field of preparation of acid chloride modified nano-TiO2 particle hybrid PVA-polypiperazine amide nanofiltration membrane, which can solve the problems affecting the dispersion effect of nanoparticles and the performance of nanofiltration membrane. To achieve the effect of easy operation, improved flux, and not easy to fall off

Inactive Publication Date: 2013-05-22
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of ordinary nano-titanium dioxide particles has a large number of hydroxyl groups. When added to the organic phase, the hydrophilicity of the hydroxyl groups will affect the dispersion effect of the nanoparticles in the organic phase, which will affect the performance of the nanofiltration membrane.

Method used

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  • Preparation method of nanofiltration membrane
  • Preparation method of nanofiltration membrane
  • Preparation method of nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Configuration mass concentration is 0.2% trimesoyl chloride (TMC) organic phase solution, wherein solvent is IsoparG; Configuration mass concentration is 0.2% piperazine aqueous solution, then adding mass concentration is 0.05% medium molecular weight polyvinyl alcohol (PVA) , soak the polysulfone support membrane in piperazine aqueous solution for 120 seconds, and then roll the polysulfone support membrane with a rubber roller to remove excess solution; after the solution is dry, contact with the organic phase solution for 20 seconds; put the membrane Into a vacuum oven at 80° C. for 12 minutes, and dried to obtain a hybrid nanofiltration composite membrane. Use 2000ppm of sodium sulfate aqueous solution, sodium chloride aqueous solution, PEG-200 aqueous solution and PEG-400 aqueous solution to test the initial performance of the membrane under the pressure of 1MPa, and the membrane is resistant to Na 2 SO 4 The desalination rates of NaCl and NaCl were 98.4% and 53.2%...

Embodiment 2

[0020] Prepare an organic phase solution of trimesoyl chloride (TMC) with a mass concentration of 0.2%, in which the solvent is IsoparG, then add a certain amount of TMC modified nano-titanium dioxide particles, ultrasonically disperse for 1 hour, and form a uniform suspension with a mass concentration of 0.005% solution; the configuration mass concentration is 0.2% piperazine aqueous solution, then add the medium molecular weight polyvinyl alcohol (PVA) that mass concentration is 0.05%, put the polysulfone support membrane into the piperazine aqueous solution and soak for 120 seconds, wherein then use rubber roller Roll the polysulfone support membrane to remove excess solution; after the solution is dry, contact with the organic phase solution just after ultrasonic dispersion for 20 seconds; put the membrane in a vacuum oven at 80°C for 12 minutes, and dry to obtain hybrid nano Filter the composite membrane and test it, the membrane is against Na 2 SO 4 The desalination rat...

Embodiment 3-4

[0022] Change the molecular weight of polyvinyl alcohol (PVA) in the aqueous phase solution, other steps are the same operating method as embodiment 1, prepare composite film and test, obtain the result as following table:

[0023]

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Abstract

The invention discloses a preparation method of a nanofiltration membrane, and particularly relates to a preparation method of a PVA (Polyvinyl Acetate)-Polypiperazine-amide nanofiltration membrane doped with acyl-chloride-modified nano-TiO2 particles. The preparation method of the nanofiltration membrane comprises the steps of adding organically-modificed nano-TiO2 particles with benzoyl chloride groups into an organic trimesoyl chloride (TMC) solution to be dispersed into a solution, and then, enabling the solution to contact with an aqueous solution containing piperazine (PIP) and polyving alcohol (PVA) to be subjected to interfacial polymerization reaction to obtain an organic nano-modification composite nanofiltration membrane. The preparation method has the advantages that under the 1MPa operating pressure on the prepared membrane, water flux is obviously enhanced, meanwhile, high salt rejection to sodium sulfate is displayed, the rejection ratio of the sodium chloride is 50.4%, and different separation capabilities to univalent salt and divalent salt are represented; and the acyl-chloride-modified nano-TiO2 particles can favorably disperse in an organic phase, and assists an aqueous phase in forming a uniform membrane structure in the interfacial polymerization reaction.

Description

technical field [0001] The invention relates to a preparation process of a composite membrane, in particular to a preparation method of an acyl chloride-modified nanometer TiO2 particle hybrid PVA-polypiperazine amide nanofiltration membrane. Background technique [0002] Nanofiltration membrane is a new membrane separation technology between ultrafiltration and reverse osmosis. Its technical feature is to achieve selective permeation of dissolved components through steric hindrance and electrostatic interaction, and the pressure of the operating system is much lower than that of the reverse osmosis process (operating pressure is usually 0.4-1MPa), and the nanofiltration membrane is resistant to divalent ions The rejection rate of solutes with a molecular weight greater than 200 is greater than 90%, while the rejection rate of monovalent ions and low molecular weight solutes is generally lower than 50%, thus achieving selective separation of substances. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D67/00
Inventor 周勇宋杰翟丁高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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