Browse Prior Art Database

Method of Fabricating the Gas Separation Layer in Fully Assembled Membrane Units

IP.com Disclosure Number: IPCOM000019421D
Publication Date: 2003-Sep-12
Document File: 1 page(s) / 25K

Publishing Venue

The IP.com Prior Art Database

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 an oxygen partial 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 High-purity oxygen permeate and nitrogen-enriched non-permeate products are withdrawn from the modules.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.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 52% of the total text.

Method of Fabricating the Gas Separation Layer in Fully Assembled Membrane Units

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 an oxygen partial 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.

One method of fabricating such ion transport membranes is through the conventional ceramic fabrication steps of tape casting, lamination, and firing of the components. The active membrane area is the dense ceramic which transports the oxygen ion. Porous ceramic layers act as support for the dense active layer. Research has shown that conventional ceramic processing routes will limit the active membrane layer to a minimum thickness of ~30 mm. Since the oxygen yield per unit a...