Cleaning system and method for cleaning a flow restrictor in a supercritical fluid extraction system
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United States of America Patent
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Jan 30, 2001
Grant Date -
N/A
app pub date -
Feb 18, 1999
filing date -
Feb 18, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A source of oxidizing gas is coupled to a flow restrictor during a cleaning cycle in which the flow restrictor is heated to a temperature for a period of time sufficient to oxidize and remove built up residue from prior analysis. In one embodiment compressed air is supplied at a pressure of from 20 to 40 psi into the flow path for supercritical fluid, while at the same time the flow restrictor is heated to a temperature of from 300.degree. to 400.degree. C. to oxidize and remove built up residue. A heater assembly employs a resistance heater positioned to heat the restrictor for a period of approximately 12 hours, such that the system can be cleaned overnight when analyses are not normally performed.
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