Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Patent
1993-09-21
1995-08-15
Gromada, Denise L.
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
34516, 15406, F26B 300
Patent
active
054408245
ABSTRACT:
The interior of a gas cylinder is cleaned using a supercritical fluid. A treating material, such as carbon dioxide, is injected into the cylinder, and the pressure in the cylinder is increased until the pressure of the treating material exceeds its critical pressure. Then, the cylinder is heated until the temperature of the treating material exceeds its critical temperature. The treating material therefore becomes a supercritical fluid. The treating material is maintained in its supercritical state while the cylinder is rolled for a period of time, while the supercritical fluid dissolves contaminants on the interior surface of the cylinder, and on objects within the cylinder. Then, the supercritical fluid is vented from the cylinder, preferably while the fluid in the cylinder is maintained in its supercritical state. This process provides exceptionally thorough cleaning of the interior of the cylinder, and makes it possible to provide a cylinder gas having a level of contaminants of the order of parts per billion or better.
REFERENCES:
patent: 5013366 (1991-05-01), Jackson et al.
Boehm Alfred U.
Ramachandran Sivaramasubramanian
Eilberg William H.
Gromada Denise L.
MG Industries
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