Preparation method of nanofiltration membrane by particle packing method

A technology of nanofiltration membrane and fana, which is applied in the field of inorganic nanofiltration membrane preparation, can solve the problems of long gel drying cycle, high cost, complicated preparation process, etc., to simplify the multiple coating process and reduce the membrane production cycle and cost effects

Inactive Publication Date: 2009-10-28
BEIJING UNIV OF CHEM TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] In sol-gel technology, the process of preparing sol is relatively mature. The main problems of this technology are high cost, long synthesis time, long cycle of gel drying, and the process is very complicated, requir

Method used

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preparation example Construction

[0016] The surface film was prepared by sol-gel method. To 0.025mol / L HNO 3 Add 1% aluminum isopropoxide to the solution, stir for 10 minutes, heat rapidly to 95°C, reflux at a constant temperature for 6 hours, then add polyvinyl alcohol with a mass fraction of 0.5%, stir until completely dissolved, cool and age to obtain Translucent Al 2 o 3 Sol.

[0017] But the present invention is not limited to the Al obtained by the above method 2 o 3 Sol.

Embodiment 1

[0019] Take Al with a particle size of 200-500nm 2 o 3 The fine powder and 2g / L sodium hexametaphosphate solution are prepared into a suspension with a volume concentration of 1.5%, and the ceramic blank is immersed in it for 60s, taken out, dried at room temperature, put into a muffle furnace and calcined at 1200°C for 1h, Take it out after cooling, and remove excess aluminum oxide floating dust on the surface. Repeat the steps of dip coating, drying, calcination and dedusting again. Finally, the prepared Al 2 o 3 The sol was coated on one side of the ceramic blank after the second dedusting step for 5 seconds, placed in a humid environment to dry, and finally the formed film was used for sugar / alcohol solution filtration, which could remove 86.2% sugar. There are a total of 10 steps in the process, and the cycle is 12 days.

Embodiment 2

[0021] Take Al with a particle size of 10-50nm 2 o 3 The fine powder and 2g / L sodium hexametaphosphate solution are prepared into a suspension with a volume concentration of 1.5%, and the ceramic blank is immersed in it for 60s, taken out, dried at room temperature, put into a muffle furnace and calcined at 1200°C for 1h, Take it out after cooling, and remove excess aluminum oxide floating dust on the surface. Repeat the steps of dip coating, drying, calcination and dedusting again. Finally, the prepared Al 2 o 3 The sol was coated on one side of the ceramic blank after the second dedusting step for 5 seconds, placed in a humid environment to dry, and the final film formed was used for sugar / alcohol solution filtration, which could remove 82.9% sugar. There are 10 steps in total, and the process cycle is 12 days.

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Abstract

The invention relates to a preparation method of a nanofiltration membrane by a particle packing method, belonging to the field of inorganic membrane preparation. The method adopts aluminium oxide fine powder with a certain particle size to carry out filling pretreatment to a ceramic support body, and achieves the purpose of modifying the surface of the support body and inner pore diameter, thus improving the membrane-making quality of the post stage and simplifying the preparation technique. The invention shortens the technique steps from 15 to 21 steps for repeating the steps of coating, drying and hot treatment for 5 to 7 times in the traditional membrane-making technique by a sol-gel method to the 10 steps and shortens the period from 30 days to 10 to 12 days.

Description

Technical field: [0001] The invention belongs to the field of preparation of inorganic nanofiltration membranes, in particular to a process for simplifying the preparation of aluminum oxide nanofiltration membranes by adopting particle filling technology. Background technique: [0002] Membrane separation technology is an emerging high-efficiency separation technology. It has the advantages of good high temperature resistance and chemical stability, high mechanical strength, anti-microbial erosion, and long service life. At present, the world's annual sales of membrane products have exceeded 10 billion US dollars, with an annual growth rate of 14-30%. In most membrane separation processes, the substances do not undergo phase changes, the separation coefficient is large, and the operating temperature is around room temperature. Therefore, it is an important new technology to solve major problems such as energy, resources, and the environment faced by contemporary humans. Me...

Claims

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Application Information

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IPC IPC(8): B01D71/02
Inventor 魏刚陈沉王晓娜
Owner BEIJING UNIV OF CHEM TECH
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