Cleaning and liquid contact with solids – Processes – With treating fluid motion
Patent
1992-08-10
1994-05-31
Springer, David B.
Cleaning and liquid contact with solids
Processes
With treating fluid motion
134 1, 134 7, 134 10, C02F 146
Patent
active
053165918
ABSTRACT:
Undesired material is removed from a chosen substrate by a process comprising the steps of (a) placing the substrate containing the undesired material in a cleaning chamber provided with cavitation-producing means; (b) introducing a liquefied gas, such as liquid carbon dioxide, into the cleaning chamber and contacting the substrate containing the undesired material with the liquid carbon dioxide at a temperature below its critical temperature; and (c) exposing the liquid carbon dioxide to the cavitation-producing means for a period of time sufficient to remove the undesired material from the substrate. The substrate containing the undesired material may optionally be contacted with carbon dioxide in the dense phase prior to and/or after the cavitation treatment to aid in removal of the undesired material. Further, spent liquid carbon dioxide may be treated to regenerate fresh liquid carbon dioxide which is recycled to the cleaning chamber. Other gases besides carbon dioxide which may be used include nitrous oxide, sulfur hexafluoride, and xenon.
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Bagaasen, "Liquid/Supercritical Fluid Carbon Dioxide Cleaning of Stainless Steel Components", RFP-4476, Nov. 25, 1991, report under Government contract.
Chao Sidney C.
Purer Edna M.
Stanford Thomas B.
Townsend Carl W.
Denson-Low W. K.
Hughes Aircraft Company
Lachman M. E.
Sales M. W.
Springer David B.
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