Gas separation: processes – Degasification of liquid – By reduction of pressure
Reexamination Certificate
2004-11-05
2008-08-19
Smith, Duane (Department: 1797)
Gas separation: processes
Degasification of liquid
By reduction of pressure
C095S241000, C096S201000, C096S193000, C250S492210
Reexamination Certificate
active
07413596
ABSTRACT:
The present invention provides methods and apparatus for the production of liquids and vapors that are free of, or substantially free of, dissolved or trapped gases. In one embodiment, a liquid is placed in a sealed vessel and subjected to a temperature below the freezing point of the liquid for sufficient time to substantially, if not completely, turn the liquid into a solid. Concurrent with or subsequent to the cooling of the liquid, the interior of the vessel is subjected to a vacuum so as to evacuate all or substantially all of the gaseous atmosphere. Thereafter, the vessel is heated to a temperature above the melting point of the liquid, allowing the frozen material to return to its liquid form or sublimate to form a vapor.
REFERENCES:
patent: 208304 (1878-09-01), Gamgee
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patent: 4022592 (1977-05-01), Saaski
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patent: 5814819 (1998-09-01), Sinclair et al.
patent: 6248642 (2001-06-01), Dolan et al.
“An Apparatus for Degassing Liquids by Vacuum Sublimation” by T. N. Bell et al.; Dec. 1968; The Journal of Physical Chemistry; vol. 72, No. 13; pp. 4693-4695.
Cracchiolo John B.
Platow Wilhelm P.
Reyes Jaime M.
Todorov Stanislav S.
Smith Duane
Theisen Douglas J
Varian Semiconductor Equipment Associates Inc.
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