| abstract |
An apparatus for extracting biomass includes a closed loop circuit comprising an extraction vessel 11, an evaporator (12, Fig. 1), a compressor (13 Fig. 1), a condenser (14, Fig. 1) and optionally, a storage container 15 operatively connected in series. A pumped recirculation loop 20 recirculates a portion of the output of the extraction vessel 11 for further contact with the biomass. One or more modifiable resistances to flow 21, 23 control the flow of solvent around the recirculation loop 20 and the main closed loop. The modifiable resistances may include adjustable flow control valves and/or orifice plates. The biomass in the extraction vessel 11 is in the form of a packed bed occupying substantially entirely the cross-section of a part of the extraction vessel 11 in which the solvent contacts the biomass. A method for the use of this apparatus for the extraction of biomass is also claimed. |