부산대학교 도서관

In the last quarterly report we presented results of coprocessing runs made with an Illinois No. 6 coal and an AMOCO VTR (as received) and after the heavy oil had been pretreated a number of different ways. Coal conversions and product yields were presented for each coprocessing experiment. We have now further analyzed results from coprocessing experiments in order to estimate the yields of coal-derived gas, asphaltenes and oil products. Although coal-derived products can not be measured directly from the coprocessing experiments, since coal and petroleum products are commingled, they can be estimated based on repeat reactions with the petroleum solvent alone. This technique assumes that the petroleum solvent reacts to yield the same products whether coal is present or not. When the coal was coprocessed with untreated heavy oil 58% of coal (MAF) was converted to gas and liquid products. We estimated that 7% of coal was converted to oils (n-pentane solubles), 28% to asphaltenes (n-pentane insolubles) and 24% to hydrocarbon gases, mostly methane. When the same coal was coprocessed with AMOCO oil that had been pretreated with 1000 ppM (metal concentration) of Mo naphthenate, 81% of coal was converted; this is an average of two runs. Coal-derived oil yield remained nearly the same at 8% and gas yield remained at 23%. However, the asphaltene yield increased from 28% to 50%. The increase in asphaltenes accounted for the increase in coal conversion. Table 4 shows yields for the case where Illinois No. 6 coal was coprocessed with AMOCO oil that was first pretreated in two steps; step one with 1000 ppM of Mo naphthenate, step two with the catalyst Ni/Mo/Al{sub 2}O{sub 3}. As a result of this reaction, 85% of coal was converted to gas and liquids. Gas yield was 19%, oil yield was 10% and asphaltene yield was 56%. As in the previous run, most of the coal was converted to asphaltenes.