PURPOSE: To obtain a depolymerized coal convertible to a light liquid product in a high yield with mild hydrotreatment by treating with a swelling solvent, after depolymerizing a coal by bringing a fine coal into contact with a hard acid in the presence of a soft base and extracting with a polar solvent.
CONSTITUTION: A coal is depolymerized by bringing fine coal particles of 10-1,000 μm particle size into contact with a hard acid (the heat of reaction with dimethylsulfid is 10-30 kcal/mol, e.g. methane sulfonic acid) at temperatures of 15-75°C for about one hour, in the presence of a soft base (the heat of reaction with boron trifluoride is 10-17 kcal/mol., e.g. ethylmercaptan) at temperatures of 0-100°C. The depolymerized coal is treated by extraction with a polar solvent (e.g. methanol) for removing a part of the hard acid, the soft base and mineral contaminants. And, then the depolymerized coal is treated with a swelling solvent having a density of 1.2-2.6 (chlorinated or brominated solvent, e.g. methylene chloride) for removing the mineral contaminants unremoved by the extraction.
DANIERU POORU RIITA
UIRIAMU ANTONII RANBAATEI
MAAKU MAIKERU DEISUKO
SUTEINDAA KUMAA BEHARU
EDOUIN ROBAATO AANSUTO
