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Composite ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane, cellulose technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of easy pollution, decreased separation efficiency, strong hydrophobicity of polyethersulfone, and prolong the use time. , The effect of improving performance and strong anti-pollution ability

Inactive Publication Date: 2011-04-27
INNER MONGOLIA MANZHOULI SENNUO BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyethersulfone has strong hydrophobicity, which is easy to cause serious membrane fouling, and the separation efficiency decreases.
[0005] In order to overcome the shortcomings of the membrane material itself, such as poor hydrophilicity, easy pollution, and poor strength, people often use some physical or chemical methods to modify it.
In recent years, some scholars have tried to use Al 2 o 3 , SiO 2 、TiO 2 Inorganic nanoparticles and organic substances are used to modify polyethersulfone ultrafiltration membrane materials, and the prepared composite membrane materials show excellent performance. However, the manufacturing cost of these ultrafiltration membranes is high, the price is expensive, and the preparation process Complicated and not conducive to large-scale promotion and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Prepare materials according to the following weight ratio:

[0038] Polyethersulfone 8g

[0039] Cellulose micro-nano crystals 1.8g

[0040] Polyvinylpyrrolidone K30 0.25g

[0041] N,N-Dimethylformamide 40ml

[0042] 2. Preparation of casting film stock solution

[0043] 1) Preparation of polyethersulfone-cellulose micro-nano crystal mixed solution

[0044] Add polyethersulfone into 40ml of N,N-dimethylformamide, stir to dissolve polyethersulfone; then add cellulose micro-nano crystals and polyvinylpyrrolidone K30, stir well to obtain polyethersulfone-cellulose micro-nano crystal mixture.

[0045] 2) Shaking, ultrasonic dispersion and dissolution of the mixed solution

[0046] The polyethersulfone-cellulose micro-nano crystal mixture was placed in a table-top air constant temperature shaker (Beijing North Tongzheng Biotechnology Development Company, model: SHK-99-II) and shaken, and the temperature of the constant temperature shaker was controlled at 28°C. Aft...

Embodiment 2

[0056] 1. Prepare materials according to the following weight ratio:

[0057] Polyethersulfone 7g

[0058] Cellulose micro-nano crystals 2.0g

[0059] Polyvinylpyrrolidone K30 0.35g

[0060] N,N-Dimethylacetamide 40ml

[0061] In addition to using 40ml of N,N-dimethylacetamide as the organic solvent, the temperature of the constant temperature shaker is 30°C, the shaking time is 42 hours, and the time for ultrasonic-assisted dissolution is 2 hours, the steps of preparing the casting film stock solution are the same as Example 1 is the same.

[0062] In the degassing step of the cast film stock solution, except that the relative vacuum degree is -0.05MPa, the degassing time is 12 hours and the thickness of the film in the film forming step is 250 μm, the rest is the same as that of Example 1.

[0063] The performance index of the polyethersulfone composite ultrafiltration membrane prepared in this example was tested according to the detection method of HY / T050-1999 ("Hollow...

Embodiment 3

[0065] 1. Prepare materials according to the following weight ratio:

[0066] Polyethersulfone 6g

[0067] Cellulose micro-nano crystals 1.4g

[0068] Polyvinylpyrrolidone K30 0.45g

[0069] N,N-Dimethylacetamide 30ml

[0070] In addition to using 30ml of N,N-dimethylacetamide as the organic solvent, the temperature of the constant temperature shaker is 30°C, the shaking time is 48 hours, and the time for ultrasonic-assisted dissolution is 1 hour, the steps of preparing the casting film stock solution are the same as Example 1 is the same.

[0071] In the degassing step of the cast film stock solution, except that the relative vacuum degree is -0.08MPa, the degassing time is 10 hours and the thickness of the film in the film forming step is 200 μm, the rest are the same as in Example 1.

[0072] The performance index of the polyethersulfone composite ultrafiltration membrane prepared in this example was tested according to the detection method of HY / T050-1999 ("Hollow Fibe...

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Abstract

The invention discloses a composite ultrafiltration membrane and a preparation method thereof. The composite ultrafiltration membrane comprises the following raw materials in portion by weight: 6 to 9 portions of polyether sulfone and 1.4 to 2.2 portions of cellulose powder. The composite ultrafiltration membrane material has good hydrophilicity and overcomes the defects of poor hydrophilicity and weak pollution resistance of a polyether sulfone ultrafiltration membrane material, because cellulose molecular chains are provided with a plurality of hydroxyl groups. The composite membrane material has strong pollution resistance, high water flux, good retention characteristic and high strength, prolongs the service life of the ultrafiltration membrane, and saves the production cost.

Description

technical field [0001] The invention relates to an ultrafiltration membrane used in a separation process and a preparation method thereof, in particular to a polyethersulfone composite ultrafiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology refers to the separation, classification, purification and enrichment of solutes and solvents in mixtures under the promotion of external energy or chemical potential difference by means of selective osmosis of membranes. As an efficient separation technology, membrane separation technology has been widely used in chemical industry, environmental protection, electronics, light industry, textile, petroleum, food, medicine, bioengineering, energy engineering and other fields. Foreign experts even call the development of membrane separation technology the "third industrial revolution", which is considered to be one of the most promising high-tech technologies from the end of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/10
Inventor 张力平陈国伟
Owner INNER MONGOLIA MANZHOULI SENNUO BIOTECH CO LTD
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