Mineral oils: processes and products – Products and compositions – Lubricating oils
Patent
1978-05-26
1980-02-19
Levine, Herbert
Mineral oils: processes and products
Products and compositions
Lubricating oils
208 8LE, 260705, 4236585, C10G 104, B01D 1102
Patent
active
041893760
ABSTRACT:
A method is disclosed for solvent-extracting an extractable component from a mixture including the extractable component and subdivided solids, comprising: (a) maintaining a vertically extending bed comprising the solids in an extraction zone and introducing the mixture into an upper portion of the bed; (b) introducing a vaporizable liquid solvent into the upper portion of the bed; (c) providing a substantially continuous gaseous phase in contact with a lower portion of the bed; (d) maintaining a substantially continuous liquid phase comprising the solvent in contact with the upper portion of the bed above the gaseous phase, the liquid phase and gaseous phase having an interface at a vertically intermediate level, extracting the extractable component from the mixture by passing the solvent through the upper portion of the bed, and removing a liquid stream including the solvent and the extractable component from the extraction zone; (e) preventing the liquid phase from flowing downwardly through the lower portion of the bed by maintaining the gaseous phase at a pressure sufficient to support the liquid phase thereon, and vaporizing liquid adhering to solids in the lower portion of the bed; and (f) removing the solids from the lower portion of the bed.
REFERENCES:
patent: 2965557 (1960-12-01), Price
patent: 3475318 (1969-10-01), Gable et al.
patent: 3875046 (1975-04-01), Rosenbloom
Chevron Research Company
Davies R. H.
Levine Herbert
Newell D. A.
Reese W. D.
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