Abstract
Supercritical carbon dioxide (scCO2) was studied for separation of bio-oil applying different pressures (100, 200, 300bar), temperatures (60, 80°C), carriers (SiO2, activated carbon), and times (1–6h). The maximum extraction yield (13–14wt%) was obtained at 300bar, 60°C with SiO2 as carrier. The composition of the scCO2 extracts was determined by GC–MS/FID. The concentration progress of 32 typical compounds in the extracts at 200bar was monitored in detail. At 200bar pressure, the contents in the scCO2 extracts of aldehydes, furanones, coniferyl alcohol, coniferyl aldehyde, and vanillin increased with extraction time. Acids, ketones and most of the guaiacols decreased while phenols and pyrans remained the same. More acids, ketones, and furaldehydes could be obtained at a lower temperature and more aromatic compounds could be extracted when SiO2 as the carrier was employed. The yields of individual components were mainly depending on the duration of extraction.
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