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Method for preparing high-flux porous carbon carbide separation membrane

A porous silicon carbide and separation membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of low permeability of silicon carbide membrane and complicated process of preparation, so as to improve gas permeability, Simple operation steps and stable performance

Active Publication Date: 2019-10-18
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when a filter membrane with a small pore size is prepared, due to the large number of transition layers, not only the process of preparation is more complicated, but also the prepared silicon carbide membrane has low permeability.

Method used

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  • Method for preparing high-flux porous carbon carbide separation membrane
  • Method for preparing high-flux porous carbon carbide separation membrane
  • Method for preparing high-flux porous carbon carbide separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Mix aluminum diethylenetriaminepentaacetate fiber with 0.5 wt% methyl cellulose, and stir evenly to obtain a transition layer fiber solution with a mass concentration of 4 wt%.

[0031] (2) Disperse 10 wt% silicon carbide, 0.1 wt% calcium oxide, 0.1 wt% zirconia and 0.1 wt% mullite in 0.5 wt% methyl cellulose solution, in which the average The particle size is 5 μm, and the average particle size of calcium oxide, zirconia and mullite is 0.5 μm, and the coating liquid is obtained after stirring evenly.

[0032] (3) Brush the fiber transition layer solution in step (1) onto the surface of the silicon carbide support with a pore size of 20 μm, brush for 5 times, and then dry for 30 min.

[0033] (4) Spray the coating solution obtained in step (1) onto the surface of the support in step (3). During the spraying process, the distance between the nozzle of the spray gun and the carbonized intersilicon support is 10 cm, and the spraying pressure is 0.1 MPa. The spraying t...

Embodiment 2

[0037] (1) Mix aluminum diethylenetriamine pentaacetate fiber with 0.5 wt% methyl cellulose, and stir evenly to obtain a solution of aluminum diethylenetriamine pentaacetate fiber with a mass concentration of 0.5 wt%.

[0038] (2) Disperse 25 wt% silicon carbide, 0.2 wt% calcium oxide, 0.2 wt% zirconia and 0.2 wt% mullite in a 2 wt% methylcellulose solution, in which the average The particle size is 10 μm, and the average particle size of calcium oxide, zirconia and mullite is 1 μm, and the coating liquid is obtained after stirring evenly.

[0039] (3) Brush the fiber transition layer solution in step (1) onto the surface of the silicon carbide support with a pore size of 30 μm, brush once, and then dry for 30 min.

[0040] (4) Spray the coating solution obtained in step (1) onto the surface of the support in step (3). During the spraying process, the distance between the nozzle of the spray gun and the silicon carbide support is 10 cm, and the spraying pressure is 0.3 MPa. T...

Embodiment 3

[0044] (1) Mix aluminum diethylenetriamine pentaacetate fiber with 2 wt% methyl cellulose, and stir evenly to obtain a solution of aluminum diethylenetriamine pentaacetate fiber with a mass concentration of 2 wt%.

[0045](2) Disperse 25 wt% silicon carbide, 0.3 wt% calcium oxide, 0.3 wt% zirconia and 0.3 wt% mullite in a 2 wt% methylcellulose solution, in which the average The particle size is 10 μm, and the average particle size of calcium oxide, zirconia and mullite is 0.5 μm, and the coating liquid is obtained after stirring evenly.

[0046] (3) Brush the fiber transition layer solution in step (1) onto the surface of the silicon carbide support with a pore size of 30 μm, brush three times, and dry for 30 min after each brushing.

[0047] (4) Spray the coating solution obtained in step (1) onto the surface of the support in step (3). During the spraying process, the distance between the nozzle of the spray gun and the silicon carbide support is 20 cm, and the spraying pres...

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Abstract

The invention relates to a method for preparing a high-flux porous carbon carbide separation membrane. A macroporous carbon carbide support is adopted as a carbon carbide membrane for substrate preparation with an asymmetric structure, a diethylenetriamine pentaacetic acid fiber is adopted as a sacrificiable transition layer, the support of a large aperture is matched with separation layer granules of small particle sizes, and an endosmosis phenomenon of the separation layer granules can be overcome; and a separation layer of a carbon carbide membrane is prepared through a spraying method, andin the high-temperature separation layer calcining process, a middle fiber transition layer is also removed, so that the structure of the carbon carbide membrane can be simplified, and the high-fluxporous carbon carbide separation membrane can be prepared. The carbon carbide separation membrane prepared by using the method comprises the macroporous support and the small-pore separation layer aswell, in addition has no middle transition layer, is good in gas permeability, high in filtration precision, simple in preparation process operation and easy in on-scale production, can be used in industrial dust cleaning devices, and has wide application prospects in industries such as coal chemical plants, thermal power plants and metal smelting factories.

Description

technical field [0001] The invention belongs to the field of high-temperature dust removal materials, and in particular relates to the preparation of a silicon carbide separation membrane. Background technique [0002] In recent years, with the development of industrial technology, industrial activities have become more and more frequent, and air pollution has become more and more obvious. Large areas of smog have frequently appeared in many areas of the country. The excessive emission of fine particles is considered to be the direct cause of the smog phenomenon. However, in the industrial waste gas, it not only contains a large amount of dust, but also the temperature of the gas is relatively high, and it is accompanied by toxic substances such as nitrogen oxides and sulfur oxides. Harmful chemical components are difficult to deal with, and the requirements for equipment materials are high. Silicon carbide has high mechanical strength, good heat resistance and corrosion re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/622C04B38/00C04B41/87B01D71/02B01D67/00
CPCC04B35/565C04B35/622C04B35/62222C04B38/00C04B41/87C04B41/5059B01D71/02B01D67/0041C04B2235/3208C04B2235/3244C04B2235/3463C04B2235/5212C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/6567C04B2235/658C04B41/4543C04B41/4582C04B41/0072
Inventor 仲兆祥邢卫红乔浩张峰韩峰魏巍
Owner NANJING UNIV OF TECH
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