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Method for shaping gradient-straight-hole double-layer asymmetric ceramic oxygen separation membrane

A forming method and technology of oxygen separation membrane, which is applied in the forming field of gradient straight hole asymmetric ceramic oxygen separation membrane, can solve the problem of high tortuosity factor of asymmetric ceramic oxygen separation membrane support body, lower gas transmission speed on support body, and restrict oxygen Improve the surface oxygen exchange rate, improve the oxygen permeation flux, and reduce the tortuosity factor

Inactive Publication Date: 2017-05-10
WUHAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

At the same time, the asymmetric ceramic oxygen separation membrane support prepared by traditional dry pressing method and casting method has the disadvantages of high tortuosity factor and low porosity, which reduces the gas transmission speed in the support body and is easy to Faced with serious concentration polarization problems, restricting its oxygen permeability

Method used

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  • Method for shaping gradient-straight-hole double-layer asymmetric ceramic oxygen separation membrane
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  • Method for shaping gradient-straight-hole double-layer asymmetric ceramic oxygen separation membrane

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Embodiment Construction

[0029] (1) Ammonium polyacrylate, polypropylene and polysaccharide were dissolved in deionized water to form an aqueous solution; gadolinium oxide-doped cerium oxide (Ce 0.9 Gd 0.1 o 1.95 , GDC) powder and strontium oxide doped lanthanum manganate ((La 0.8 Sr 0.2 ) 0.95 MnO 3-δ , LSM) powder according to the mass ratio of 62.2:37.8 ball mill and mix uniformly to make GDC-LSM composite ceramic powder; add GDC-LSM composite ceramic powder to the aqueous solution prepared above, ball mill and mix uniformly to obtain a stable water-based ceramic slurry , the mass content of deionized water, ceramic powder and organic matter in the water-based ceramic slurry is 32.2%, 57.8% and 10.0%, respectively, and the organic matter is 4.5% ammonium polyacrylate, 4% polypropylene and 1.5% polysaccharide;

[0030] (2) Put the water-based ceramic slurry in a vacuum pump, and vacuum degass for 10 minutes to remove the air bubbles introduced during the mixing process of ball milling;

[0031...

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Abstract

The invention provides a method for shaping a gradient-straight-hole double-layer asymmetric ceramic oxygen separation membrane by a freeze drying and tape casting method. According to the method, a tape casting process and a gradient straight hole forming process by freeze drying are combined, a raw membrane band body in a specific thickness is prepared by the tape casting process and is then transferred onto a low-temperature freezing bed; a water-base slurry is quickly frozen and cured on the freezing bed, and in the cuing process, gradient straight ice crystals are formed inside the raw membrane band body; the raw membrane band body is finally transferred into a vacuum kettle, the ice crystals in the raw membrane band body is directly evaporated into vapor in the low-temperature and vacuum condition, and the gradient straight holes are reserved at the positions of the ice crystals. The method has the advantages that the asymmetric membrane with the gradient straight hole structures is low in tortuosity, high in porosity and the like, remarkable reduction of concentration polarization in the ceramic oxygen separation membrane is hopeful, and oxygen penetrating quality and energy utilization rate of the ceramic oxygen separation membrane are increased.

Description

technical field [0001] The invention relates to the field of gas separation membranes, in particular to a method for forming a gradient straight hole asymmetric ceramic oxygen separation membrane. Background technique [0002] Oxygen is an important chemical raw material, and a large amount of oxygen is consumed in the process of fossil energy processing and conversion, metal product processing and molding. The traditional cryogenic fractionation technology and pressure swing adsorption technology have disadvantages such as huge initial investment, complex equipment and high energy consumption, which restrict the large-scale popularization of the above-mentioned oxygen production technology. Ceramic oxygen separation membrane oxygen production technology is expected to reduce the system energy consumption by more than 30% compared with the traditional oxygen production process, has received more and more attention, and has made significant progress. [0003] The oxygen perm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/634C04B35/636C04B41/87
CPCC04B35/62218C04B35/63408C04B35/63444C04B35/636C04B41/009C04B41/5045C04B41/87C04B41/5028
Inventor 王瑶刘通
Owner WUHAN UNIV
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