PROCESS FOR LIQUEFYING BROWN COAL

摘要

In a process for liquefying brown coal by heating and pressurizing a crude slurry composed of a mixture of raw brown coal and a solvent, subjecting the slurry to gas-liquid separation and dehydration, and conducting liquefaction through hydrogenation, a CO2-containing gas generated in a preheating dehydration step and/or one fed from outside the system are/is blown into the crude slurry in the preheating dehydration step to thereby convert a carbonate-forming metal component in the brown coal into a carbonate in advance for improving liquefaction efficiency and realizing stabilized operation for a long time.