Swelling pretreatment of coal for improved liquefaction at less severe conditions

摘要

Tests were performed to study the effect of solvent swelling pretreatment of a subbituminous coal on the liquefaction at different conditions. Methanol, THF and pyridine were used as swelling agent, and the liquefaction of swollen coals and untreated coal was carried out in an autoclave apparatus. The results indicated that swelling pretreatment of coal can effectively increase the THF conversion of coal liquefaction at below 400°C. It is necessary to use some catalyst to obtain high conversion at low temperature. The FT-i.r. and SEM analyses indicated that by solvent swelling pretreatment, the coal structure becomes much more uniform while the main structure no changed.