Low Severity Coal Liquefaction to Determine Reactivity of Coals: Technical Progress Report No. 3 for Period 12/1/86 Through 2/28/87

摘要

The objectives of this investigation are (1) to determine the reactivity of bituminous coals for liquefaction using moderate temperature hydrogenation, and (2) to examine the reaction chemistry involved in the moderate temperature liquefaction as a function of reaction time, temperature and catalyst application. The experimental work involves hydrogenation of a bituminous coal at 325 sup 0 C in the absence of a donor solvent and catalyst. Then, the effect of reaction temperature and catalysts will be studied at temperatures between 300 and 350 sup 0 C using two catalysts, FeS sub 2 and ammonium molybdate. The effects of reaction time and temperature on the hydrogenation of an Illinois bituminous coal have been examined. Four reactions were carried out at 325 sup 0 C under H sub 2 pressure of 2900 psig for 1.5, 3, 14 and 27 h. Two additional reactions were conducted at 300 and 350 sup 0 C for 3 h. Product composition changed with the reaction time. The oil:asphaltene:preasphaltene ratio was 2:3:1 in the 14 and 27 h reactions. With shorter reaction periods, the yields of C sub 1 -C sub 2 gas, oil and asphaltene decreased to a similar extent, while preasphaltene yield increased moderately and residue yield increased drastically. This product distribution reveals that the coal was converted mainly by a parallel formation of oil, asphaltene and preasphaltene followed by some sequential formation of oil and asphaltene from preasphaltene. IR spectra of some product fractions obtained in 1.5 and 3 h reactions showed strong, sharp absorptions due to aryl-alkyl ethers or weak, well-resolved absorptions due to carbonyl groups. The separation and identification of aryl-alkyl ether groups are of great significance for the structure/reactivity studies. 3 refs., 5 figs., 3 tabs. (ERA citation 12:040337)