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ITM Oxygen Membranes by Increasing the Grain Size

IP.com Disclosure Number: IPCOM000019436D
Publication Date: 2003-Sep-12
Document File: 1 page(s) / 25K

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Abstract

Oxygen can be recovered from air at high temperatures by passing hot, compressed, oxygen-containing gas, preferably air, over non-porous, mixed-conducting ceramic membranes. These membranes, known in the art generically as ion transport membranes, utilize a pressure differential across the membrane to cause oxygen ions to migrate through the membrane. In addition to conducting the oxygen ions, these mixed-conductors allow electrons to move in the opposite direction for the formation of the oxygen ions on the feed side and oxygen molecules on the permeate side of the membrane. Membranes can be fabricated as tubes or flat plates that are arranged in modules for efficient contacting with hot compressed air. High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules. A class of ITM membranes that are not mixed-conducting materials can also be used in this application. In these cases, the oxygen ions are driven through the membrane by applying an external voltage potential to the membrane. A comprehensive review of ion transport membranes is given by J. D. Wright and R. J. Copeland in Report No. TDA-GRI-90/0303 prepared for the Gas Research Institute, September 1990.

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ITM Oxygen Membranes by Increasing the Grain Size

Oxygen can be recovered from air at high temperatures by passing hot, compressed,
oxygen-containing gas, preferably air, over non-porous, mixed-conducting ceramic membranes. These membranes, known in the art generically as ion transport membranes, utilize a pressure differential across the membrane to cause oxygen ions to migrate through the membrane. In addition to conducting the oxygen ions, these mixed-conductors allow electrons to move in the opposite direction for the formation of the oxygen ions on the feed side and oxygen molecules on the permeate side of the membrane. Membranes can be fabricated as tubes or flat plates that are arranged in modules for efficient contacting with hot compressed air. High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules. A class of ITM membranes that are not mixed-conducting materials can also be used in this application. In these cases, the oxygen ions are driven through the membrane by applying an external voltage potential to the membrane. A comprehensive review of ion transport membranes is given by J. D. Wright and R. J. Copeland in Report No. TDA-GRI-90/0303 prepared for the Gas Research Institute, September 1990.

         The effect of grain size on oxygen permeation through cobaltite perovskite mixed-conductor membranes has not been well studied in the literature. The literature presents contradictory evidence on the effect of grain size on flux. Jacobson[1] reports that the flux increases with decreasing grain size in SrCo0.8Fe0.2O3-x. Conversely, Kharton[2] reports the opposite effect. In experiments with La1-xSrxCo1-yFey O3-x (0 ≤ y ≤ 1, 0 ≤ x ≤ 1), we discovered that the flux increased with the grain size. Tests...