Supercritical fluid extractions (SFE) of hazelnut shell and hazelnut kernel husk samples were carried out and the results were compared with those obtained by Soxhlet solvent extraction method in lab conditions. N-hexane and methanol as solvents were used in both extractions. Statistical results showed that the extraction yield of biomass using SFE (25.7–38.5%) was higher than Soxhlet extraction (3.0–18.6%). Average biodiesel yields from the samples by supercritical hexane extraction and supercritical methanol extraction are 9.4 and 15.8 wt% of dry basis, respectively.
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A. Demirbaş (2008) studied this question.
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