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Pressure gradient passivation of carbonaceous material normally susceptible to spontaneous combustion

United States Patent

November 14, 2000
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
This invention is a process for the passivation or deactivation with resp to oxygen of a carbonaceous material by the exposure of the carbonaceous material to an oxygenated gas in which the oxygenated gas pressure is increased from a first pressure to a second pressure and then the pressure is changed to a third pressure. Preferably a cyclic process which comprises exposing the carbonaceous material to the gas at low pressure and increasing the pressure to a second higher pressure and then returning the pressure to a lower pressure is used. The cycle is repeated at least twice wherein the higher pressure may be increased after a selected number of cycles.
Ochs; Thomas L. (Albany, OR), Sands; William D. (Butler, PA), Schroeder; Karl (Pittsburgh, PA), Summers; Cathy A. (Albany, OR), Utz; Bruce R. (Pittsburgh, PA)
The United States of America as represented by the Department of Energy (Washington, DC)
09/ 354,051
July 15, 1999
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The United States Government has rights in this invention pursuant to the employer-employee relationship of the U.S. Department of Energy and the inventor.