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Electrochemical Oxygen Separation Cylinder Replacement System

IP.com Disclosure Number: IPCOM000019418D
Publication Date: 2003-Sep-12
Document File: 2 page(s) / 94K

Publishing Venue

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Abstract

Oxygen can be recovered from air at high temperatures by passing a hot, oxygen-containing gas, preferably air, over non-porous, solid electrolyte ceramic membranes. These membranes, known in the art generically as ion transport membranes (ITMs), utilize an electrochemical potential difference 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 feed air. High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules. The oxygen can also be produced by the ITM device at pressures exceeding the feed air pressure. 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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Electrochemical Oxygen Separation Cylinder Replacement System

         Oxygen can be recovered from air at high temperatures by passing a hot, oxygen-containing gas, preferably air, over non-porous, solid electrolyte ceramic membranes. These membranes, known in the art generically as ion transport membranes (ITMs), utilize an electrochemical potential difference 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 feed air. High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules. The oxygen can also be produced by the ITM device at pressures exceeding the feed air pressure. 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 use of oxygen produced by ITM technology is a practical alternative to oxygen supplied from cylinders for some small volume applications. Examples include oxygen for welding, metal cutting , and oxygen respiratory therapy. A compressed "shop air" system can be configured to provide both the oxygen and the "shop air" required by the facility. In such a system, the membrane assembly and associated piping can be contained by a vessel that is pressurized by the incoming process air. This design allows the oxygen pressure to be raised to about the same level as the incoming air while keeping the stack in isostatic compression and minimizing stresses. The membrane assembly, where separat...