Abstract
In studies at the University of North Dakota sponsored by the U.S. Office of Coal Research, batch liquefaction tests with 15 coal-derived (C-D) and 10 petroleum-derived (P-D) potential solvents as hydrogen donors, in a 1 gal autoclave at 752/sup 0/F, 2850-3300 psig max, and at a 1 : 1 carbon monoxide/hydrogen mole ratio showed that C-D creosote oil, C-D anthracene oil, FS-120 (Gulf carbon-black feedstock), and aromatic concentrate (a heavy catalytic cracking recycle stock) should be adequate for lignite liquefaction. Compared with P-D solvents, the C-D solvents have much lower sulfur contents and higher percentages of ''standard solvent'' in their ''as-received'' form, but P-D solvents offer lower light oil yields and thus higher net SRL (solvent-refined lignite) yields, lower hydrogen requirements for hydrogenating the feed solvent, fewer plugging problems following liquefaction, and higher recycle solvent recovery. Pending further tests, enough recycle solvent should be available to make solution hydrogenation viable.
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