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Method for preparing unsymmetrical biphase composite oxygen permeable membrane

An oxygen-permeable membrane and asymmetric technology, which is applied in the field of preparation of asymmetric dual-phase composite oxygen-permeable membranes, can solve the problems of pinholes or cracks, difficulty in densification, and complicated processes, and achieve high structural stability and high oxygen permeability. , the effect of high chemical stability

Active Publication Date: 2009-06-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The traditional asymmetric oxygen-permeable membrane preparation process mostly prepares the porous carrier part first, and then prepares the dense oxygen-permeable membrane layer on the porous carrier by physical or chemical means. This process is complicated. Such a preparation process prepares a small-area oxygen-permeable membrane layer Easy, but many difficulties will be encountered in the preparation of large-area industrialized membrane modules, such as difficulty in densification, defects such as pinholes or cracks, poor repeatability, etc.

Method used

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  • Method for preparing unsymmetrical biphase composite oxygen permeable membrane
  • Method for preparing unsymmetrical biphase composite oxygen permeable membrane
  • Method for preparing unsymmetrical biphase composite oxygen permeable membrane

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Embodiment 1

[0026] First mix all metal ion nitrates to synthesize 65wt% Ce 0.85 SM 0.15 o 1.925 —35wt%Sm 0.6 Sr 0.4 FeO 3 Two-phase composite membrane, and then prepare an asymmetric two-phase composite oxygen-permeable membrane by dissolving in hydrochloric acid. The specific steps are as follows: according to the relative mass ratio of the desired two kinds of oxides, all metal ions (Ce 3+ 、Sm 3+ 、Sr 2+ , Fe 3+ ) Nitrate is poured into a beaker, and an appropriate amount of EDTA and citric acid are added thereto, that is, the ratio of the amount of EDTA and citric acid to the total metal ion is 1:1 and 1:1.5, respectively. Then use NH 3 ·H 2 O adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a colloid with the continuous evaporation of water, pretreat the colloid at 400°C for preliminary decomposition, and calcinate the primary powder at 950°C for 5 hours That is, the composite oxide powder obtained by the ...

Embodiment 2

[0028] First mix all metal ion nitrates to synthesize 65wt% Ce 0.80 SM 0.20 o 1.9 —35wt%Sm 0.5 Sr 0.5 FeO 3 Two-phase composite membrane, and then prepare an asymmetric two-phase composite oxygen-permeable membrane by controlling the dissolution time of hydrochloric acid. The specific method is as follows: according to the relative mass ratio of the desired two kinds of oxides, all metal ions (Ce 3+ 、Sm 3+ 、Sr 2+ , Fe 3+ ) Nitrate is poured into a beaker, and an appropriate amount of EDTA and citric acid are added thereto, that is, the ratio of the amount of EDTA and citric acid to the total metal ion is 1:1 and 1:1.5, respectively. Then use NH 3 ·H 2 O adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a colloid with the continuous evaporation of water, pretreat the colloid at 400°C for preliminary decomposition, and calcinate the primary powder at 950°C for 5 hours That is, the composite oxide pow...

Embodiment 3

[0030] First mix all metal ion nitrates to synthesize 75wt% Ce 0.80 SM 0.2 0O 1.9 —25wt%Sm 0.5 Sr 0.5 FeO 3-δ Two-phase composite membrane, and then prepare an asymmetric two-phase composite oxygen-permeable membrane by controlling the concentration of hydrochloric acid. The specific method is as follows: according to the relative mass ratio of the desired two oxides, all metal ions (Ce 3+ 、Sm 3+ 、Sr 2+ , Fe 3+ ) Nitrate is poured into a beaker, and an appropriate amount of EDTA and citric acid are added thereto, that is, the ratio of the amount of EDTA and citric acid to the total metal ion is 1:1 and 1:1.5, respectively. Then use NH 3 ·H 2 O adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a colloid with the continuous evaporation of water, pretreat the colloid at 400°C for preliminary decomposition, and calcinate the primary powder at 950°C for 5 hours That is, the composite oxide powder obtain...

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Abstract

The invention provides a method for preparing an asymmetrical two-phase composite oxygen permeation membrane, which comprises the following processes: performing grinding, leveling, supersonic cleaning and drying on a two-phase composite oxygen permeation membrane which consists of an oxygen ion conductor and an oxygen ion-electron mixed conductor; protecting one surface of the oxygen permeation membrane, making the other surface of the oxygen permeation membrane exposed and placing the other surface of the oxygen permeation membrane into 1.0 to 50 percent of acid solution for soakage, wherein the soaking temperature is between 10 and 80 DEG C, and the soaking time is between 10 and 360 hours; and forming the asymmetrical two-phase composite oxygen permeation membrane. A porous carrier of the prepared asymmetrical two-phase composite oxygen permeation membrane has high voidage and centralized pore size distribution, and a porous carrier layer and an oxygen permeation membrane layer can be well fused and not separated. The asymmetrical two-phase composite oxygen permeation membrane has high oxygen permeability, and has high chemical stability and structural stability under reducing atmosphere. An asymmetrical composite oxygen permeation ceramic membrane prepared can be used for selecting and separating oxygen from oxygen-containing gas mixture and for converting natural gas into synthetic gas in a membrane reactor.

Description

technical field [0001] The invention relates to a preparation method of an asymmetric two-phase composite oxygen-permeable membrane. Background technique [0002] Mixed conductor oxygen permeable membrane is a kind of dense inorganic membrane. Its oxygen permeability mechanism is essentially different from that of porous inorganic membrane, and it is also different from solid electrolyte dense membrane. It is a new type of membrane with both oxygen ion conductivity and electronic conductivity. Ceramic Membrane. At high temperature (especially when the temperature is greater than 600°C), when there is an oxygen concentration gradient on both sides of the membrane, oxygen will be conducted in the form of oxygen ions through the bulk phase from the high oxygen pressure region to the low oxygen pressure region, and at the same time, the electrons will Conduction in the opposite direction keeps the material electrically neutral. This material does not require an external circui...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B41/91
Inventor 杨维慎李其明朱雪峰丛铀
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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