Abstract
Two US lignites (from Texas and North Dakota) were fractionated by density with appropriately prepared mixtures of liquid halogenated and non-halogenated hydrocarbons. Petrographic analyses confirmed that the procedure resulted in density fractions enriched in specific macerals. Liquid yields obtained upon solubilization at 430 °C and 5.5 MPa hydrogen pressure decreased with increase in the density fraction for both lignites. On plotting the total solubilities of lignites and their density fractions versus their huminite contents a reasonably good linear correlation was obtained (particularly for North Dakota lignite). It is tentatively concluded that in North Dakota lignite, as opposed to Texas lignite, macerals other than huminite did not significantly contribute to generation of liquid products.
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