39.極性溶剤を用いた爆砕前処理による石炭の熱分解反応性の改質

抄録

A brown coal was swollen in vapor of polar organic solvents highly pressurized to 2-7MPa at 220-280℃ for 1h, and was instantaneously released with the solvent vapor into an evacuated chamber at ambient temperature. Rapid and adiabatic expansion of solvent vapor exploded and quenched the coal. The original and exploded coals were subjected to flash pyrolysis at 764℃ in He or N_2 by using a Curie-point pyrolyzer. The explosion treatment with methanol drastically increased tar yield from 18wt% to 33wt%, while it decreased the yeilds of char and inorganic gases (H_2, CO, CO_2 and H_2O). FT-i.r. analysis revealed that the explosion treatment patially broke hydrogen bondings and caused O-methylation between methanol and coal OH, both of which degraded macromolecular network of the coal and suppressed the cross-linking among OH groups.