Abstract
A new coal pyrolysis method which dramatically increases the total volatiles was presented. A brown coal oxidized by H2O2 at 60°C was extracted up to 80 % by a mixed solvent of methanol/1-methylnaphthalene at room temperature. The extract solubilized in the mixed solvent was pyrolyzed in flash mode at 650 to 850°C. Surprisingly more than 90% of the extract was converted to volatiles. On the other hand, the total volatiles were 70% when the dried extract was pyrolyzed. It was clarified that the dispersion of the extract in the solution and its molecular structure control the pyrolysis behavior. From these results it was demonstrated that the combination of the liquid phase oxidation and the flash pyrolysis of the oxidized coal dissolved in the solvent produced 84kg of volatiles from 100kg of coal.
