2-20　Liquid fuel production with high calorific value from biomass by degradative solvent extraction using deep eutectic solvent

抄録

Deoxygenation is necessary to obtain fuel with high calorific value from biomass. In this study, liquid fuel production with high calorific value from cedar powder (below 600μm) as the feed biomass by degradative solvent extraction using deep eutectic solvent (DES) was investigated. A mixture of choline chloride (hydrogen bond acceptor, HBA) and FeCl₃-6H₂O (hydrogen bond donor, HBD) in a molar ratio of 1:2 was mainly used as DES catalyst. By stirring cedar powder and DES in 1-methylnaphthalene solvent under nitrogen atmosphere in a autoclave at a low temperature, it was possible to extract the component dissolving in the solvent (Soluble). When the degradative solvent extraction was performed at 100, 150, and 200°C, the Soluble yields were 8, 28, and 19wt%, respectively. The Soluble yield increased with increasing the reaction time.

When the amount of cedar powder/DES was 5g/2.5g, the Soluble yield and carbon content reached 31wt% and 81wt%, respectively. In this way, it was found that the degradative solvent extraction using DES is an effective method for obtaining liquid fuel with high calorific value from biomass at low temperature.