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• W1968696595 abstract "Coprocessing reactions were carried out using five coals and three petroleum residua at 350, 400, and 450 °C with N2 and H2. No catalyst was used. The interactions between the coal and the petroleum residua were investigated in terms of following the conversions and yields of THF-insolubles. The influence of temperature, time, petroleum residua, and coal characteristics was examined. Conversions at or below 400 °C are primarily determined by the nature of the coal. The characteristics of the residuum have little influence on the coal conversions. The residuum behaves like a liquid medium for the coal fragments at this temperature regime and does not have properties of a hydrogen donor or hydrogen shuttler. The maximum coal conversion is ≈40 wt %, comparable to the conversions obtained in pyrene under the given conditions. At temperatures >400 °C retrogressive reactions are observed, indicated by low or even overall negative conversions (−20 wt %). The retrogressive reactions are a result of the interactions between the coal and petroleum residuum fragments and are influenced by the properties of the coal as well as the petroleum residuum. Both the coal and the residuum must be undergoing thermal decomposition for the retrogressive reactions to occur. Residua that have a higher degree of polycondensation (Har/Car ≤ 0.4) may be inferior coprocessing solvents at temperatures >400 °C. Similarly, noncaking coals proved to be less desirable than caking coals." @default.
• W1968696595 created "2016-06-24" @default.
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• W1968696595 date "1997-01-01" @default.
• W1968696595 modified "2023-09-27" @default.
• W1968696595 title "Coal/Petroleum Residuum Interactions during Coprocessing under Noncatalytic, Low Solvent/Coal Ratio Conditions" @default.
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• W1968696595 doi "https://doi.org/10.1021/ef960103w" @default.
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