Cresap Pilot Plant CSF Process operations were simulated in cycling operations of a 10 Ib of coal/h continuous unit. Mass spectral and H NMR analyses indicated essentially steady-state operation in the third of the four completed cycles. Integrated gravity settling produced 0.22 wt % ash extract. Using an antisolvent did not improve deashing. Introduction and SummaryPittsburgh Seam 8 coal was liquefied by the Consol Synthetic Fuel (CSF) donor solvent process and deashed via gravity settling at 600 O F with and without an antisolvent. These continuous 10 lb coal/h tests were done to provide guidance for the 20 TPD Cresap CSF Pilot Plant. Highlights of these experiments follow.Mass spectral and NMR analyses showed that the CSF solvent closely approached steady state in three cycles of integrated operation and that tetralins, hydrophenanthrenes, and hydropyrenes were the predominant hydrogen donors.Extract from steady-state operations contained 0.22 wt 70 ash, which slightly exceeds the EPA specification of 0.20%. The low settler upflow velocity (0.3 in./min) used translates to about 34 40-ft diameter settlers for a commercial plant processing 25 000 TPD coal.Using paraffinic anti-solvent to precipitate a fraction of

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