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- W8575670 abstract "Coal liquefaction residues from the SYNTHOIL (Pittsburgh Seam) and H-Coal (Illinois No. 6) processes were fractionated by solvent extraction into oils and resins, asphaltenes, preasphaltenes, and mineral solids for adsorption, filtration, surface tension, and viscosity measurements. Suspended solids in liquefied coal range in size from less than 0.05 ..mu.. to greater than 1 ..mu... The specific resistance of filter cakes varies as an inverse function of the number average particle size. THF insoluble solids from SYNTHOIL product oil, H-Coal vacuum still bottoms and SYNTHOIL centrifuge cake had number average particle sizes of 0.067, 0.071, and 0.147 ..mu.., respectively. When filtered from tetralin at 177/sup 0/C, the specific resistances were 0.7 x 10/sup 12/, 0.6 x 10/sup 12/, and 0.31 x 10/sup 12/ m/kg, respectively. At temperatures below 200/sup 0/C, the H-Coal filter cake compressibility was 0.36. The specific filtration resistance is temperature dependent above 200/sup 0/C, being from 50 to 100 percent higher at 232/sup 0/C than at 177/sup 0/C. Surface tension and reduced viscosity data for oils, resins, and asphaltenes in tetralin indicate intermolecular association and colloid micellization. At asphaltene and preasphaltene concentrations about 15 percent, micelle formation is significant. The micelles interact with porous media through which theymore » flow to give an increase in cake resistance of 40 to 100 percent, depending on the size of the micelles in relation to the size of the flow passages. Resins act to peptize the micelles, which limits their size.« less" @default.
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- W8575670 date "1977-09-01" @default.
- W8575670 modified "2023-09-27" @default.
- W8575670 title "Studies on the separation of coal extract from solid residue in liquefied coal" @default.
- W8575670 hasPublicationYear "1977" @default.
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