Method and apparatus for recovering a solvent
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United States of America Patent
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-
Feb 3, 2009
Grant Date -
Oct 30, 2003
app pub date -
May 29, 2003
filing date -
Sep 6, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A closed-loop biomass extraction apparatus using HFC solvents including an extraction vessel, an evaporator for the solvent, a compressor and a condenser connected in series in a closed loop extraction circuit; a solvent recovery loop constituted by a bypass line; a plurality of flow control valves that are selectively operable for connecting the solvent recovery loop in parallel with the closed loop extraction circuit; and at least one container containing an adsorbent for organic contaminants and a desiccant, the container being connected in the solvent recovery loop to which solvent in the extraction circuit may be supplied through selective operation of the flow control valves whereby solvent used in the extraction circuit may be supplied through the adsorbent and the desiccant.
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