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- W136384037 abstract "Supercritical solvents can provide moderate yields of syncrude-like materials from coal, and these yields are not primarily due to any unique characteristics of supercritical conditions. Since high solvent densities are desirable, solvents that are liquid at liquefaction temperatures could prove at least as effective as those that are supercritical, and at lower pressures. Liquids, however, are subject to the limitations of surface tension and higher viscosities, which diminish their usefulness in this scheme. Additionally, solvents that are liquid at liquefaction temperatures are very difficult to separate from coal products. Thus, supercritical solvents offer solvent fluidity, a relatively wide range of usable types of compounds, and easily obtainable high solvent recoveries in the extraction of low molecular weight materials from coal. An understanding of the importance of the thermal processes involved in the treatment of coal with hot, dense solvents and the principles of supercritical extraction, as enumerated at the outset of this paper, could lead to an effective use of supercritical solvents in coal and lignite processing." @default.
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- W136384037 date "1978-01-01" @default.
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- W136384037 title "Supercritical solvents and the dissolution of coal and lignite. [Book chapter]" @default.
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