Apparatus and method for supercritical fluid extraction
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United States of America Patent
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Mar 22, 1994
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N/A
app pub date -
Jun 11, 1993
filing date -
Jul 13, 1990
priority date (Note) -
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Abstract
An apparatus for supercritical fluid extraction incorporates a removable extraction cartridge which in operation has insignificant pressure difference between its inside and outside walls. In one embodiment, the extractor includes a fraction collector for extractants, an automatic sample changer and an automatic cartridge transfer mechanism which provide completely automated extractions. To automatically perform extraction, valves for the fluids are automatically opened and closed in synchronism with the insertion and removal of the cartridges. These valves force a hard valve element into a softer valve seat with a valve stem that does not rotate significantly under the control of a rotary motor.
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