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UPGRADING COAL LIQUIDS

Distillations. The upgraded coal liquids were distilled with a metal-mesh-spinning-band still under the conditions shown in Figure 1 to produce cuts at 200°, 325°, and 425° C. Asphaltenes were then precipitated from each >425° C residuum dissolved in benzene by addition of 50 volumes of normal pentane (15). Further distillations on the asphaltene-free materials, at 202° C and 4 micron pressure using a wiped-wall molecular still, produced 425° to 540° C distillate cuts and residua fractions. [Pg.11]

Table II. Properties of Crude and Upgraded Coal Liquids... [Pg.17]

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Catalytic Upgrading of Crude Coal Liquids in the Secondary Stage

Coal liquids

Primary coal liquids upgrading

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