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Preparation method for cross-linking polyvinyl alcohol furfural nanofiltration membrane

A technology of polyvinyl furfural and polyvinyl alcohol, which is applied in the field of preparation of hydrophilic charged membranes, can solve problems such as difficulty in regulating the filling amount of nano-silica, and achieve novel preparation methods, good selectivity, and good affinity water effect

Active Publication Date: 2010-06-16
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the filling amount of nano-silica is difficult to control, and there is no report on the spectral solvent resistance.

Method used

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  • Preparation method for cross-linking polyvinyl alcohol furfural nanofiltration membrane
  • Preparation method for cross-linking polyvinyl alcohol furfural nanofiltration membrane
  • Preparation method for cross-linking polyvinyl alcohol furfural nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Heat and stir 3% polyvinyl alcohol (PVA) and appropriate amount of water in a flask until the solution becomes transparent, add hydrochloric acid dropwise to adjust the pH value, add 10 mL of furfural (Fu), and stir until transparent. Add 5g of maleic anhydride dropwise, until it dissolves completely, filter the obtained PVFu solution to remove impurities, degas it with a vacuum pump for 2 hours, then pour it into a metal frame with a porous polysulfone base film, and keep it for 3 Minutes, use a rubber roller to remove the PVFu solution remaining on the surface of the polysulfone, vacuum dry at 100°C for 2 hours and take it out to obtain a PVFu nanofiltration membrane. Wherein the porous polysulfone base membrane is selected from polysulfone and polyethersulfone.

[0030] With 2000ppm (one millionth of the mass concentration) of Na 2 SO 4 , NaCl, PEG200, MgCl 2 , PEG600 aqueous solution, test the initial performance of the membrane under the pressure of 1MPa. The o...

Embodiment 2-5

[0032] Keep the addition of furfural (Fu) 10mL and maleic anhydride 5g unchanged, change the feeding amount of polyvinyl alcohol, other operating conditions are all the same as in Example 1, and the results are as shown in table 1

[0033] Table 1

[0034]

[0035]

Embodiment 6

[0037] Heat and stir 5% polyvinyl alcohol (PVA) and appropriate amount of water in a flask until the solution becomes transparent, add hydrochloric acid dropwise to adjust the pH value, add 10 mL of furfural (Fu), and stir until transparent. Filter the obtained PVFu solution to remove impurities, use a vacuum pump to defoam for 2 hours, then pour it into a metal frame with a porous polysulfone bottom film, keep it for 3 minutes, and use a rubber roller to remove the residue on the surface of polysulfone. The PVFu solution was vacuum-dried at 90° C. for 2 hours and taken out to obtain a PVFu nanofiltration membrane. Wherein the porous polysulfone base membrane is selected from polysulfone and polyethersulfone.

[0038] With 2000ppm (one millionth of the mass concentration) of Na 2 SO 4 , NaCl, PEG200, MgCl 2 , PEG600 aqueous solution, test the initial performance of the membrane under the pressure of 1MPa. The obtained results are as follows: 2 SO 4 The desalination rate ...

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PUM

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Abstract

The invention discloses a preparation method for high polymer material membrane, and in particular relates to a preparation method for hydrophilic charged membrane. The invention comprises the following steps: mixing polyving akohol and water, adjusting the pH value of the mixture, then orderly adding furfural and cross-linking agent in the mixture until the reaction is complete; performing surface reaction on the reacted polyvinyl alcohol furfural water solution and the basement membrane, and carrying out certain post-processing to obtain corresponding composite membrane. The method has the advantages that the preparation method is novel and simple, and the nanofiltration membrane has good hydrophily, high PEG600 interception ratio, and high selectivity. The membrane prepared by the method can be widely used in various separation industries.

Description

technical field [0001] The invention relates to a preparation method of a polymer material film, in particular to a preparation method of a hydrophilic charged film. Background technique [0002] Nanofiltration is a new type of membrane separation technology. The cut-off range of nanofiltration membrane is between 200-2000, the operating pressure is lower than that of reverse osmosis, and the rejection rate of monovalent ions is much lower than that of divalent ions. It has a good separation effect on organic pollutants. [0003] Commonly used nanofiltration membranes are: polyarylamides, polypiperazineamides, sulfonated polysulfones, polyvinyl alcohols, etc. Aromatic polyamides and polypiperazine amides use interface polymerization to prepare charged surfaces; sulfonated polysulfones and polyvinyl alcohols use coating methods to prepare charged surfaces. [0004] A large number of industrial nanofiltration membranes have been prepared by interfacial polymerization, and pi...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/38B01D69/12
Inventor 周勇翟丁高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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