Mineral oils: processes and products – By treatment of solid mineral – e.g. – coal liquefaction – etc. – Including contact of feed with liquid produced in the...
Patent
1985-09-19
1987-05-12
Caldarola, Glenn
Mineral oils: processes and products
By treatment of solid mineral, e.g., coal liquefaction, etc.
Including contact of feed with liquid produced in the...
208424, 208429, 208434, 208952, C10G 2100, C10G 2114, C10G 2920
Patent
active
046647880
ABSTRACT:
A multi-stage coal liquefaction method in which coal is slurried with a primary light solvent, such as toluene, hexane and/or cyclohexane, and a process-derived primary heavy solvent. The coal-primary solvent slurry is treated under coal-liquefying conditions to form a first feed solution containing coal liquefaction products. The first feed solution is treated by a multi-stage supercritical solvent extraction procedure. The final heavy phase produced by this procedure is mixed with a secondary solvent, such as pentane, to produce a second feed mixture, which is treated in a second multi-stage supercritical solvent extraction procedure. Heavy phases recovered from the separate stages of both solvent extraction procedures are blended to provide a recycled primary heavy solvent.
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Gir Srikant
Rhodes Donald E.
Addison William G.
Caldarola Glenn
Kerr-McGee Corporation
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