Name : [in Japanese]
Location : [in Japanese]
Date : October 26, 2021 - October 27, 2021
Pages 22-23
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.
