Low Severity Coal Liquefaction to Determine Reactivity of Coals: Technical Progress Report No. 2 for Period 09/01/86 Through 11/30/86

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 deg 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 deg C using two catalysts, FeS sub 2 and ammonium molybdate. Three reactions of an Illinois bituminous coal were carried out at 325 deg C under H sub 2 pressure of 2900 psig for 3, 14 and 27 h. Conversion to gaseous and soluble products was close to 90% in 14 and 27 h reactions. Preliminary data from the 3 h reaction showed substantially lower conversion. Yields of oil, asphaltenes and preasphaltenes were similar in the 14 and 27 h reactions: the yield ratio was 2:3:1. Elemental composition revealed that oils and asphaltenes of 14 and 27 h reactions are similar, respectively, while preasphaltenes are significantly different. Atomic H/C ratio of the products ranged from 0.95 to 1.24, indicating substantial hydrogenation and/or deoxygenation. The similar product distribution and composition indicate that the formation of oil, asphaltenes and preasphaltenes was essentially completed within 14 h of reaction time. Oil, asphaltenes and preasphaltenes are significantly different from each other in H/C ratio and oxygen content. Considering little change in the product distribution after 14 h, the differences among the fractions suggest that the fractions were derived from different precursors in the feed oil. 2 refs., 2 figs., 3 tabs. (ERA citation 12:019906)