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Achillea millefolium L. (yarrow) from Bulgaria was extracted in a supercritical pilot-scale plant using carbon dioxide (CO2). First, the extraction yield was studied as a function of time at 14MPa, 40°C and 70g/min of CO2. Then, the extraction time was set in order to study the effect of different process parameters (pressure, temperature, CO2 flow and use of ethanol as co-solvent) on the extraction...
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