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Preparation method of a ceramic hollow fiber solvent-resistant composite nanofiltration membrane

A composite nanofiltration membrane, solvent-resistant technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of improving the application field, environmental friendliness, excellent chemical stability and mechanical properties

Active Publication Date: 2018-07-10
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, research on inorganic nanofiltration membranes is still in its infancy, and there are few industrial applications.

Method used

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  • Preparation method of a ceramic hollow fiber solvent-resistant composite nanofiltration membrane
  • Preparation method of a ceramic hollow fiber solvent-resistant composite nanofiltration membrane
  • Preparation method of a ceramic hollow fiber solvent-resistant composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of γ-Al 2 o 3 / α-Al 2 o 3 Hollow fiber solvent-resistant composite nanofiltration membrane for the removal of salt ions in water

[0045] 1. Under the water condition of 70°C, according to the mass ratio polyethersulfone (PES): polyvinylpyrrolidone (PVP): Al 2 o 3 Particles: 1-methyl-2-pyrrolidone = 8: 0.5: 50: 41.5, stir and mix evenly, keep for more than 24 hours to obtain a uniform and stable casting solution; prepare α-Al by wet spinning method 2 o 3 Hollow fiber ceramic base membrane, soaked in pure water for 24 hours, dried and sintered in an electric furnace with programmed temperature rise, after sintering, naturally cool down to obtain the finished membrane;

[0046] 2. Add 10.5g aluminum isopropoxide (Al(OC 3 h 7 ) 3 ) slowly added in batches to 90g of deionized water mechanically stirred at 85°C, after hydrolysis for 2 hours, the isopropanol produced by the reaction was removed, and 0.7875g of debonding agent HNO was added 3 After aging ...

Embodiment 2

[0050] Under the condition of 70°C waters, the mass ratio of polyethersulfone (PES): polyvinylpyrrolidone (PVP): Al 2 o 3 Particles: 1-methyl-2-pyrrolidone = 8: 0.5: 50: 41.5, stir and mix evenly, keep for more than 24 hours to obtain a uniform and stable casting solution; prepare α-Al by wet spinning method 2 o 3 Hollow fiber ceramic base membrane, soaked in pure water for 24 hours, dried and sintered in an electric furnace with programmed temperature rise, after sintering, naturally cool down to obtain the finished membrane;

[0051] 2. Put 10.2g aluminum isopropoxide (Al(OC 3 h 7 ) 3 ) slowly added in batches to 90g of deionized water mechanically stirred at 85°C, after hydrolysis for 2 hours, the isopropanol produced by the reaction was removed, and 0.7875g of debonding agent HNO was added 3 After aging in a water bath at 90°C for 12 hours, add 30 mL of 5wt.% PVA solution and continue stirring for 3 hours to finally obtain γ-AlOOH sol;

[0052] 3. Apply the γ-AlOOH s...

Embodiment 3

[0055] Under the condition of 70°C waters, the mass ratio of polyethersulfone (PES): polyvinylpyrrolidone (PVP): Al 2 o 3 Particles: 1-methyl-2-pyrrolidone = 8: 0.5: 50: 41.5, stir and mix evenly, keep for more than 24 hours to obtain a uniform and stable casting solution; prepare α-Al by wet spinning method 2 o 3 Hollow fiber ceramic base membrane, soaked in pure water for 24 hours, dried and sintered in an electric furnace with programmed temperature increase, after sintering, naturally cool down to obtain the finished membrane;

[0056] 2. Put 20.4g aluminum isopropoxide (Al(OC 3 h 7 ) 3 ) slowly added in batches to 180g of deionized water mechanically stirred at 85°C, after hydrolysis for 2 hours, the isopropanol produced by the reaction was removed, and 1.575g of debonding agent HNO was added 3 After aging in a water bath at 90°C for 12 hours, add 30 mL of 10wt.% PVA solution and continue stirring for 3 hours to finally obtain γ-AlOOH sol;

[0057] 3. Apply the γ-AlOO...

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Abstract

The invention relates to a method for preparing a ceramic hollow fiber solvent-resistant composite nanofiltration membrane used for cation separation. (1) prepare α-Al2O3 hollow fiber ceramic base membrane; (2) prepare γ-AlOOH sol; In the gel method, the γ-AlOOH sol is uniformly coated on the α-Al2O3 hollow fiber ceramic base membrane by dipping and pulling technology. Al2O3 wet gel film; (4) aging the prepared composite gel film at a temperature of 5 to 30°C and a relative humidity of 30 to 70% for more than 24h, and then putting it into a heating furnace and using a temperature-programmed method to carry out Roasting and natural cooling to obtain γ-Al2O3 / α-Al2O3 hollow fiber solvent-resistant composite nanofiltration membrane; the present invention is characterized in that the preparation process is mature, the equipment is simple, the operation is easy, and the separation of γ-Al2O3 / α-Al2O3 composite nanofiltration membrane The thickness of the membrane layer is 2.12μm, and the average pore size of the membrane is 1.87nm. It can be used to remove trivalent, divalent and other multivalent cations in water. The membrane has good solvent resistance, corrosion resistance and anti-pollution performance.

Description

【Technical field】 [0001] The invention relates to the technical field of separation engineering membrane separation, in particular to a method for preparing a ceramic hollow fiber solvent-resistant composite nanofiltration membrane used for cation separation. 【Background technique】 [0002] The working principle of nanofiltration membrane (NF) is the same as that of ultrafiltration (UF) and reverse osmosis (RO). Among them, organic molecules with a molecular weight cut-off of 200 to 1000 Da are widely used in the recovery of organic solvents in wastewater, catalyst recovery in organic solvents, and recovery of solvents in petroleum refining and other chemical industries; many nanofiltration membrane surfaces are positively charged or Negatively charged, according to the Donnan effect, the ability to intercept cations with different valences is different, and it can effectively separate multivalent and monovalent ions, so it is often used in industrial wastewater for magnesiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/12B01D69/08B01D67/00
Inventor 许振良王珍魏永明曹悦
Owner EAST CHINA UNIV OF SCI & TECH
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