LIQUEFACTION BEHAVIOR OF KOLUBARA SOFT BROWN-COAL

The behaviour of Kolubara soft brown coal during direct liquefaction b y catalytic hydrogenation was studied and was compared with the Banovi ci brown coal investigated previously. A sample of washed and dried co al was ground dry, or was ground in the presence of different liquids. Addition of water during grinding resulted in a somewhat coarser gran ular composition, while n-heptane did not have a noticeable effect. Hi gh reactivity of the soft brown coal, which initially was indicated by thermal analysis, was confirmed by high yields of liquid products, pa rticularly of oils soluble in n-heptane. The solid liquefaction residu es did not contain pyrolytic carbon and cenospheres, and contained a l ow proportion of humoplasts indicating the high liquefaction efficienc y of the coal in spite of its high content of xylite.