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Method for preparing alumina ceramic membrance by ion exchange

A technology of alumina ceramic membrane and ion exchange method, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problems that ions are difficult to remove and cannot obtain a continuous and complete alumina film layer, and achieve pore size distribution. Narrow, large specific surface area effect

Inactive Publication Date: 2005-12-21
NANJING UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

The results showed that using Cl - The sol of ions cannot obtain a continuous and complete aluminum oxide film layer, and when the dialysis method is used to remove the Cl in the sol - After ionization, a complete aluminum oxide film was prepared on the glass slide, and the specific surface area of ​​the xerogel prepared by this method was 115m after being treated at 450°C. 2 / g
Preparation of Al with high integrity from the precursor of inorganic aluminum salts, aluminum chloride 2 o 3 The reason why the membrane method is rarely reported is that although aluminum hydroxide sols can be easily prepared with these inorganic aluminum salts, a large amount of Cl introduced by these aluminum salts - Ions are difficult to remove

Method used

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  • Method for preparing alumina ceramic membrance by ion exchange

Examples

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Embodiment 1

[0008] (1) A certain amount of AlCl 3 ·6H 2 O (analytical pure) was made into AlCl with a concentration of 1M 3 The solution is ready for use;

[0009] (2) Take 150ml of the above solution, add the regenerated 717 styrene anion exchange resin (Hefei University of Technology) to the AlCl in batches under the conditions of room temperature and magnetic stirring 3 in solution;

[0010] (3) AgNO should be used after adding the resin 3 Solution detection of Cl in solution - ions until no Cl is detected - After ionization, the resin is separated from the obtained sol;

[0011] (4) After aging the obtained sol in an 80°C water bath for 4 hours, adjust the pH value of the sol to about 3.7 with nitric acid, and continue to reflux in an 80°C water bath for 12 hours to obtain a clear aluminum sol;

[0012] (5) Mix the prepared sol with a 3% PVA aqueous solution in a ratio of 1:1, and coat the aluminum oxide hollow fiber by filtering and forming a film, and dry the coated carrier a...

Embodiment 2

[0015] According to the steps in Example 1, the sol was prepared, the film was coated, dried and heat-treated. The difference is that the aging time is 16 hours. The surface of the obtained hollow fiber supporting membrane is continuous and complete, and the crystal phase of the ceramic membrane is γ-Al 2 o 3 Crystalline state, the specific surface area is 176.9m 2 / g, the most accessible pore diameter is 3.65nm, and the pore volume is 0.184ml / g, which has certain gas selectivity. 2 / H 2 The separation factor is 2.80, and the gas permeation through the membrane is controlled by Knudsen diffusion.

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Abstract

The present invention relates to ion exchange method to make alumina pottery membrane. The step is: Confect AlCl3. 6H2O liquid, add anion exchange colophony step by step at room temperature magnetic force mixed; Check the Cl ion in the mixing process until all Cl ions eliminated; Getted sol is aging in hot water; adjust the PH value by nitric acid. Circumfluence and get clear aluminum sol; Mixing sol and PVA liquid, plating, drying, roasting and improve temperature and keep it; We get the complete Al2O3 membrane when the temperature of backstop decreases to room temperature. The present invention can eliminate Cl ions and get stable sol. The pottery membrane is complete, aperture is narrow and surface area is large. The membrane can be used for the filter of chemical plant, food, medicine and environment and used in katalyze reaction.

Description

A technical field [0001] The invention relates to a method for preparing a functional separation membrane, in particular to a method for preparing an alumina ceramic membrane by an ion exchange method. Two background technology [0002] As one of the most important ceramic membrane materials, alumina has significant advantages such as high mechanical strength, long service life, acid and alkali resistance, and high temperature resistance. It is obtained in the microfiltration and ultrafiltration processes of solid-liquid separation in chemical and food processes It has a wide range of applications and has attractive application prospects in the fields of gas separation and catalysis. The preparation of alumina ultrafiltration membranes usually uses organic precursors (such as various aluminum alkoxides) as raw materials, and obtains stable sols by particle method or polymerization method, and obtains a selective separation layer on the porous carrier by dip coating technolog...

Claims

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Application Information

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IPC IPC(8): B01D71/02
Inventor 王连军李健生郝艳霞王晓阳刘晓东孙秀云
Owner NANJING UNIV OF SCI & TECH
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