Apparatus and methods for reducing residual solvent levels in extracted
biomass that is contaminated with HFC solvent that includes sparging the biomass
extract with a solvent stripping gas such as air or nitrogen are disclosed. Apparatus
for carrying out the method include a vessel (12;25) containing extract
(26) and a source of the gas. The source may be in the form of a moveable,
hollow wand (27) having a sparging gas outlet; or a fixed gas inlet (30)
for bubbling the gas through the extract (26).
