High flow and overpressure resistant hyperfiltration membrane with laminar hole structure and method of preparing the same

An ultrafiltration membrane and high-flux technology, applied in the field of membrane separation, can solve the problems of membrane pollution resistance, temperature resistance, solvent resistance, pore size uniformity, mechanical stability, permeation flux and pressure resistance, etc. high volume effect

Inactive Publication Date: 2008-08-27
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems that limit the application of ultrafiltration membranes are: membrane pollution resistance, temperature resistance and solvent resistance, pore size uniformity and mechanical stability (that is, the contradiction between permeation flux and pressure resistance)
[0005] To sum up, when magnetic substances are added to the membrane solution, there is no literature report on the effect of horizontal magnetic field on the microstructure and permeability of the membrane during the membrane production process.

Method used

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  • High flow and overpressure resistant hyperfiltration membrane with laminar hole structure and method of preparing the same
  • High flow and overpressure resistant hyperfiltration membrane with laminar hole structure and method of preparing the same
  • High flow and overpressure resistant hyperfiltration membrane with laminar hole structure and method of preparing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Polysulfone-Fe with layered pore structure 3 o 4 Preparation method of flat ultrafiltration membrane

[0037] Take 100g of N,N-dimethylacetamide (DMAC) and put them in 8 iodine measuring bottles, respectively add 5.0g of polyvinylpyrrolidone (PVP) to them, and wait for it to fully dissolve; weigh 0.0g, 3.1g , 7.0g, 12.0g, 18.7g, 28.0g, 42.0g and 65.3g ferric oxide (Fe 3 o 4 ), and mixed evenly with 28.0g polysulfone (PSf) respectively, added to the above-mentioned 8 iodine measuring bottles, shaked quickly, shaked and dissolved evenly at 55-60°C, and defoamed. Scrape the film on the glass plate, evaporate in the air (humidity less than 50%, temperature 20°C) for about 5 seconds, put it in a horizontal magnetic field (magnetic field strength 1000-1500 Gauss) and continue to evaporate for 25 seconds, put it in water under the action of the magnetic field After gelling for 15 minutes, take out the membrane and soak it in distilled water for 24 hours to obtai...

Embodiment 2

[0043] Get 80ml dimethylacetamide (DMAC) and 20ml N-methylpyrrolidone and place in the iodine measuring bottle, add 13.0g polyethylene glycol respectively thereinto, and wait for it to fully dissolve; Weigh 70.0g magnetic carbon nanotubes, 5.0 Mix 5.0 g of polysulfone and 5.0 g of polyethersulfone into the above-mentioned iodine measuring bottle, shake quickly, dissolve evenly with ultrasonic vibration at 55-60°C, and then defoam. Scratch the film on the non-woven fabric, evaporate in the air (humidity less than 60%, temperature 22°C) for 3 seconds, put it in a horizontal magnetic field (magnetic field strength 3000-4500 Gauss) and continue to evaporate for 12 seconds, and put it in water under the action of the magnetic field After gelling for 15 minutes, the membrane was taken out and soaked in distilled water for 24 hours to obtain a magnetized membrane, and its pure water permeation flux was measured to be 813L.m -2 .h -1 (25°C, 0.4MPa), the rejection rate to bovine serum...

Embodiment 3

[0045] Take 150ml of dimethylacetamide (DMAC) and place it in an iodine measuring bottle, add 10.0g of polyethylene glycol and 3.0g of polyvinylpyrrolidone to it, and wait for it to fully dissolve; weigh 30.0g of Fe 3 o 4 , 10.0 g of magnetic carbon nanotubes, and 5.0 g of polysulfone were mixed and added to the above-mentioned iodine flask, shaken up quickly, dissolved evenly by ultrasonic vibration at 55-60° C., and defoamed. Coating film on polyester non-woven fabric, immediately put it in a horizontal magnetic field (magnetic field strength 6300-7200 gauss), evaporate in air (humidity less than 60%, temperature 25 ℃) environment for 30s, and then put distilled water under the action of magnetic field After gelling for 25 minutes, the membrane was taken out and soaked in distilled water for 24 hours. The pure water permeation flux of the membrane was measured to be 1190L.m -2 .h -1 (25°C, 0.3MPa), the rejection rate of bovine serum albumin is 97.0%.

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Abstract

A high-flux pressure resistant hyperfiltration membrane in layered pore structure is characterized in that the support layer of the hyperfiltration membrane is provided with macropores parallel with the surface of the hyperfiltration membrane, and the macropores are in multilayer structure. The high-flux pressure resistant hyperfiltration membrane is prepared by using the following method: (1) membrane solution is prepared by using a polymer, a magnetic material, an additive and a solvent; the magnetic material and the polymer account for 8 percent to 50 percent of the membrane solution by mass, and the magnetic material, and the combination of the magnetic material and the polymer account for 30 percent to 99 percent by weight; the additive accounts for 2 percent to 15 percent of the membrane solution by mass; (2) a magnetic field with the direction of lines of magnetic force parallel with the surface of the membrane is applied during evaporation and gelation in manufacturing of the membrane, and the intensity of the magnetic field ranges from 100 gauss to 18000 gauss. The infiltration flux of the hyperfiltration membrane in layered pore structure is high and no leakage occurs during pressurization and running. The hyperfiltration membrane can be used directly, and can be used as the multihole supporting material of a composite membrane.

Description

technical field [0001] The invention provides a method for preparing a high permeation flux and pressure-resistant ultrafiltration membrane with a layered pore structure. The prepared ultrafiltration membrane can be used directly or as a porous support material for a composite membrane. It belongs to the technical field of membrane separation. Background technique [0002] Ultrafiltration membranes are widely used in many fields. They can not only be directly used for the separation, concentration, fractionation and purification of substances, but also can be used as support materials for composite membranes such as nanofiltration, reverse osmosis, gas separation and pervaporation. According to the report of BCC Company, the sales volume of ultrafiltration membrane in the US market alone was 579 million US dollars in 2005, 635 million US dollars in 2006, and is expected to reach 908 million US dollars by 2011, and the ultrafiltration membrane will grow at an average annual r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D69/08
Inventor 黄征青陈坤张智
Owner HUBEI UNIV OF TECH
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