1-11　深共晶溶媒を用いた溶媒抽出による低炭化度炭からの高発熱量の固体燃料製造

抄録

Solid fuel production with high calorific value from Indonesian Adaro sub-bituminous Coal (150–250μm, AC) as the raw material by degradative solvent extraction using deep eutectic solvent (DES) as catalyst was studied. A mixture of choline chloride (hydrogen bond acceptor, HBA) and FeCl₃-6H₂O (hydrogen bond donor, HBD) in a molar ratio of 1:2 was used as DES catalyst. The chemical and molecular compositions of coal were characterized by chemical analysis, Fourier transform infrared spectrophotometer (FT-IR), gas chromatography, and thermogravimetric analysis (TG). By stirring AC in 1-methylnaphthalene solvent under nitrogen atmosphere in an autoclave at 350°C, it was possible to extract only 22wt% of the component dissolving in the solvent (Soluble). On the other hand, when the degradative solvent extraction using DES was performed at 200, 300, and 350°C, the Soluble yields were 11, 38, and 69wt%, respectively. When 5g of raw material and 2g of DES were used, the Soluble yield and carbon content reached 69wt% and 89wt%, respectively. In this way, it was found that the degradative solvent extraction using DES is an effective method for obtaining solid fuel with high calorific value from low-rank coal.