A - Human Necessities – 23 – F
Patent
A - Human Necessities
23
F
23/361, 23/405,
A23F 5/20 (2006.01) B01D 11/02 (2006.01)
Patent
CA 2008112
The present invention discloses a method of contacting a particulate solid with a fluid in an elongate pressure vessel which comprises continuously passing a supercritical fluid through an elongate pressure vessel at supercritical pressure while periodically moving solid particulate matter through the pressure vessel via isolatable pressurizable vessels, the pressurizable vessels being periodically pressurized to the supercritical pressure of the fluid for facilitating the periodic movement of particulate solids between said pressurizable vessels and the pressure vessel, and depressurized for facilitating the periodic movement of the solid particulate matter into and out of said pressurizable vessels. The improvement wherein pressurizing said pressurizable vessels comprises maintaining a supply of said fluid at an intermediate, non-critical pressure, at which pressure said fluid exists in both the liquid and gaseous state; introducing into said pressurizable vessels the fluid, in the gaseous state, from the supply of the fluid maintained at the intermediate pressure, to raise the pressure within the pressurizable vessels; introducing into the pressurizable vessels the fluid, in the liquid state, from the supply of fluid to further raise the pressure within the vessels to approximately the pressure of the fluid in the supply and introducing, into the pressurizable vessels, the fluid in the supercritical state to further raise the pressure within the vessels to the supercritical state. There is also disclosed an apparatus for carrying out the method.
Bruscino Joseph A.
Moorman Charles T.
Sabadics Joseph L.
Kraft Foods Inc.
Mcfadden Fincham
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