Abstract
As the main utilization method of biomass, direct pyrolysis destroyed high value-added constituents. Extract-pyrolysis cascading utilization technical was applied in two typical biomasses: chlorella (CH) and pine sawdust (PS). Four imidazolium-based ionic liquids (ILs) were chosen as the extractants, and obtained higher extraction yield for CH than PS. Among them, BmimCl (1-Butyl-3-methylimidazolium chloride) obtained highest extraction yield for CH and PS of 72.73% and 20.58%. Selected ILs exhibited strong extraction abilities of oxygen-containing compounds for both CH and PS and nitrogen-containing compounds for CH. Compared with direct pyrolysis, gas and char yields of CH and PS had obvious decrease and the liquid phase products yields increased with more diverse composition especially phenolic compounds. The liquid phase products yield of PS and CH increased by 27.15%, 37.80% and 61.20%, 70.82% using BmimHSO4 (1-Butyl-3-methylimidazolium hydrogensulfate) and BmimCl. The extract-pyrolysis characteristics of CH and PS were obtained through the comparison of gas–liquid-solid products composition and distribution, and they depend on the structure of biomass and the physical–chemical properties of ILs. Extract-pyrolysis utilization approach has potential to realize clean and high-value utilization of biomass, and more valuable liquid products can be obtained.
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