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ITM Oxygen with Low or No Net Power Output (e.g., for GTL Applications) Disclosure Number: IPCOM000030406D
Publication Date: 2004-Aug-11
Document File: 3 page(s) / 29K

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ITM Oxygen with Low or No Net Power Output (e.g., for GTL Applications)

Oxygen can be recovered from air at high temperatures by passing hot, oxygen-containing gas, preferably air, over non-porous, mixed conducting ceramic membranes.  These membranes, known in the art generically as ion transport membranes (ITMs), utilize an oxygen partial pressure differential 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 High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules.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 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. 

GTL (gas to liquids) plants, for example, tend to be in remote locations, where there is little need for the export power that is a co-product of typical ITM Oxygen cycles.  Furthermore, GTL plants generally produce large quantities of high-pressure steam that can be used to drive an air separation plant main air compressor through a steam turbine driver.

The process cycle described here is intended to allow an ITM Oxygen plant to operate cost-effectively with low or no net power output.  The cycle uses a conventional air compressor and a hot gas expander.  It also may use a steam turbine driver to consume high or medium pressure steam produced by a GTL plant. The inlet temperature of the hot gas expander is adjusted so that the expander produces only the desired power output (e....