Advanced research for the characterization of hydrogen donor solvents in two-stage liquefaction. Quarterly report, April 1, 1984-June 30, 1984 [electronic resource].
- Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1984.
- Physical Description:
- Pages: 57 : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Solvent-only reactions at SCT conditions in hydrogen were explored for each of the four blended solvents, ranging from 6.1 to 8.6 wt. % hydrogen content (nominally 6.1, 7.7, 7.4, 8.6). Generally, no loss of solvent to gas was measured, but small amounts of retrograde reactions (oil to preasphaltenes, asphaltenes, insolubles) were observed at both low and high severity. Insolubles were produced in solvent A (6.1% H) and consumed in solvent D (8.6% H). Ten hydrotreating and hydrocracking catalysts have been selected and obtained from a variety of catalyst manufacturers. A matrix of eleven runs was made using the base catalyst and solvent B (7.7% H) to determine ranges of operating conditions appropriate for further catalyst testing. A series of 72 run conditions were completed at SCT conditions for coal extraction in the microautoclave, studying the effects of temperature, residence time, pressure, solvent makeup, and atmosphere. At hydrogen-deficient conditions, coal conversions were observed to decline at the highest reaction severities (i.e. 850 to 900/sup 0/F), apparently due to condensation (coking) reactions. Preasphaltene and asphaltene yields are maximized at intermediate severities, and oil yields increase with severity over the range of conditions tested. Coal conversions in a nitrogen atmosphere were generally slightly less than in hydrogen, for all solvents, and at both mild and severe conditions. Coal conversions maximize at a solvent hydrogen content of approximately 7.5%. At this level of hydrogen content, solvent B (7.7% H), made by mild hydrogenation of KC-oil, out-performs solvent C (7.4% H), made by blending hydrogen-rich and hydrogen-deficient components. The performance of solvent C was, however, significantly better than that of either component by itself. 21 figures, 18 tables.
- Published through SciTech Connect., 01/01/1984., "doe/pc/60047-t4", "DE85001156", Hamshar, J. A.; Potts, J. D., and Cities Service Research and Development Co., Tulsa, OK (USA)
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