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Use of Alumina-Forming Alloys in Balance of ITM Plant

IP.com Disclosure Number: IPCOM000032960D
Publication Date: 2004-Nov-19
Document File: 1 page(s) / 9K

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Use of Alumina-Forming Alloys in Balance of ITM Plant

Ion Transport Membranes (ITMs) are non-porous, ceramic membranes that are made from mixed metal oxides that conduct oxygen ions and electrons at elevated temperatures.  These materials have been proposed for two primary applications involving oxygen.  The first is the separation of oxygen from an oxygen-containing gas, such as air, to produce an oxygen product.  Oxygen can be recovered at high temperatures by passing the hot gas over the ITMs utilizing an oxygen partial pressure differential across the membrane to cause oxygen ions to migrate through the membrane.  The second application provides oxygen to an oxidation reaction, such as a partial oxidation of methane to form synthesis gas, in a single step that does both the separation and the reaction.  Synthesis gas can be produced by oxidatively reforming a hydrocarbon-containing stream, which passes on one side of an ion transport membrane, with oxygen from a hot, oxygen-containing gas, preferably air, which passes on the other side of the ITM.  This separation utilizes an oxygen chemical potential gradient across the membrane to cause oxygen ions to migrate through the membrane.

Membranes can be fabricated as tubes or flat plates that are arranged in modules for efficient contact with the hot, compressed air.  High-purity oxygen permeate and nitrogen-enriched, non-permeate products are withdrawn from the modules.  A comprehensive review of ion transport membranes for oxygen production 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.  For synthesis gas production, membranes can be fabricated as tubes or flat plates that are arranged in modules for efficient contact with the hot air and hydrocarbon-containing streams.  Synthe...