Liquid purification or separation – With means to add treating material – Chromatography
Patent
1990-03-02
1992-07-28
Warden, Robert J.
Liquid purification or separation
With means to add treating material
Chromatography
210634, 210635, 210656, 210659, 210137, 210143, 55386, 203 49, 422105, 422110, 422112, 422261, 422255, 422256, 436178, B01D 1508
Patent
active
051338599
ABSTRACT:
Methods and apparatus for extracting sample components from complex matrices using supercritical carbon dioxide as the principal extracting solvent are disclosed. The present invention takes advantage of the fact that the solvent power of a supercritical fluid is stepwise settable by the parameters of density, modifier concentration, and temperature. Accordingly, methods and apparatus for extracting a component from a sample using flow system having a variable and controllable flow restriction are disclosed. The methods of the present invention comprise the steps of inserting the sample into the sample container section, inputting temperature, pressure, flow rate and extraction time setpoints. The flow rate is controlled and the system pressure regulated by the variable flow restriction. The present invention contemplates opening and closing the orifice in order to control the variable flow restriction, or closing the orifice until setpoint pressure is achieved and controlling the restriction of the orifice to maintain the setpoint pressure.The present invention also discloses apparatus for the extraction of components from a sample which include means for regulating the pressure and flowrate of a supercritical extraction solvent.
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Dryden Paul C.
Engel Steven J.
Frank Lenore R.
Wurm Christopher M.
Hewlett--Packard Company
Santiago Amelia L.
Warden Robert J.
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