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Preparation method and application of integrated three-layer structural inorganic oxygen permeating membrane

A three-layer structure and oxygen-permeable membrane technology, applied in chemical instruments and methods, separation methods, semi-permeable membrane separation, etc., can solve the problems of low purity of oxygen production and high cost of air separation technology

Inactive Publication Date: 2014-03-19
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Air separation technology has disadvantages such as high cost and low purity of oxygen produced

Method used

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  • Preparation method and application of integrated three-layer structural inorganic oxygen permeating membrane
  • Preparation method and application of integrated three-layer structural inorganic oxygen permeating membrane
  • Preparation method and application of integrated three-layer structural inorganic oxygen permeating membrane

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Experimental program
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Effect test

Embodiment 1

[0019] Weigh BaCO according to the stoichiometric ratio of each content in BCFN 3 、Co 3 o 4 , Fe 2 o 3 and Nb 2 o 5 The analytically pure reagent is placed in a polyurethane ball mill tank equipped with zirconia balls, and absolute ethanol is used as a solvent, and the weight ratio of "material: ball: absolute ethanol" is 1:2:0.8. Put it on a roller ball mill for 48 hours, then dry it in an oven at 78°C and place it in a muffle furnace for calcination at 1000°C for 24 hours, then add zirconia balls and absolute ethanol ball mill for 24 hours according to the above method, and then Dry in an oven at 78°C, and pass through a 200-mesh sieve to obtain BCFN oxide powder. The particle size distribution of the obtained powder is shown in figure 1 .

[0020] The dense layer and the porous layer oxygen-permeable membrane were prepared respectively by casting method, and the preparation process of the casting slurry was as follows: add ethanol, butanone and castor oil to the BCFN...

Embodiment 2

[0023] The experiment was carried out at 800-900°C, one point was taken every 25°C, and the heating rate was 2°C / min. Place the oxygen-permeable membrane at one end of the alumina tube with polished smooth ports, and seal it with glass sealant. Synthetic air (21% O 2 +79%N 2 ), the low oxygen partial pressure end was fed with He gas, each flow rate was controlled by a mass flow controller, and the actual flow rate was measured by a soap film flowmeter. The synthetic air and He gas flow rates were controlled to be 135ml min -1 , 90ml·min -1 . After the outlet gas passes through the gas drying pipe, measure its total flow with a soap film flowmeter, and pass it into a gas chromatograph (SP3420A) for composition and content analysis. The results are as follows: Figure 4 shown. It can be seen from the figure that the oxygen permeability of the membrane increases with the increase of temperature. When the temperature rises from 800°C to 900°C, the oxygen permeability of the t...

Embodiment 3

[0025] In the experiment, the oxygen-permeable membrane was placed at one end of an alumina tube with a polished port, and sealed with a glass sealant. Synthetic air (21% O 2 +79%N 2), the low oxygen partial pressure end is fed with He gas, each flow rate is controlled by a mass flow controller, and the actual flow rate is measured by a soap film flowmeter. After the outlet gas passes through the gas drying tube, the total flow rate is measured with a soap film flowmeter, and then passed into a gas chromatograph (SP3420A) for composition and content analysis. In this experiment, at 900°C, by changing the He gas purge flow rate on the low oxygen partial pressure side (He gas flow rate from 60-210ml·min -1 ), tested the variation of the oxygen permeability of the three-layer structure oxygen-permeable membrane reactor, the results are as follows Figure 5 shown. It can be seen from the figure that as the flow rate of He gas increases from 60ml·min -1 Increase to 210ml·min ...

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Abstract

The invention provides a preparation method and an application of an integrated three-layer structural inorganic oxygen permeating membrane. The preparation method comprises the steps of (1) preparing a mixed conductor oxygen permeating material by adopting a traditional solid-phase synthesis method; (2) mixing the oxygen permeating material powder with binder, plasticizer and solvent to prepare casting slurry; (3) respectively preparing compact layer green bodies and porous layer green bodies of the mixed conductor oxygen permeating membrane through a casting method; (4) stacking the green bodies together according to a sequence of porous layer, compact layer and porous layer, and pressing the stacked green bodies in a constant-temperature static pressing machine with temperature of 80DEG C to prepare an integrated three-layer structural oxygen permeating membrane precursor; (5) sintering the three-layer structural inorganic oxygen permeating membrane precursor to obtain the integrated three-layer structural inorganic oxygen permeating membrane. The integrated three-layer structural oxygen permeating membrane can be used for high-efficiently and selectively separating the high-purity oxygen from the oxygen-containing mixed air.

Description

(1) Technical field [0001] The invention relates to a novel integrated three-layer structure inorganic oxygen-permeable membrane, in particular to a preparation method and application of an integrated three-layer structure inorganic oxygen-permeable membrane. (2) Background technology [0002] Industrial oxygen production usually uses air separation or membrane separation technology to obtain oxygen from air. Air separation technology has disadvantages such as high cost and low purity of oxygen produced. Membrane separation technology has the advantages of simple process, high efficiency and high oxygen purity. The mixed oxygen ion electronic conductor oxygen permeable membrane does not need an external voltage, and only relies on the oxygen partial pressure on both sides of the membrane to drive the oxygen reduction and oxygen evolution reactions, which can further reduce the cost. [0003] Mixed ion-electronic conductor dense ceramic membrane is a new type of ceramic mem...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00B01D69/12B01D53/22
Inventor 宋世栋阮艳莉王坤杨明望李康
Owner TIANJIN POLYTECHNIC UNIV
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