Cleaning and liquid contact with solids – Processes – Including regeneration – purification – recovery or separation...
Patent
1978-06-30
1980-06-03
Fisher, Richard V.
Cleaning and liquid contact with solids
Processes
Including regeneration, purification, recovery or separation...
134 22R, 134 26, 134 34, 134 40, 210 73W, B08B 308, B08B 310, B08B 908
Patent
active
042060010
ABSTRACT:
A method is described for cleaning nonsettling oil-solid mixtures from the bottom of catalytic cracking rundown tanks wherein a solvent of particular specifications is introduced in the rundown tank and circulated around, in and through the non-settling oil solids with an angularly adjustable pump. After the floating oil-solid mixture has been separated by the solvent, the solvent and liquid are removed from the tank, separated and recycled to process streams. The remaining settled solid sediments may then be washed with an aqueous solution circulated in the tank with the adjustable pump to water-wash additional oils from the solid sediments, and the aqueous solution and oils carried therewith are removed from the tank and separated. The remaining solid materials are then vacuumed from the tank or water-washed from the tank to complete the cleaning process initiated totally from outside of the tank.
REFERENCES:
patent: 2715594 (1955-08-01), Garrison
patent: 3536529 (1970-10-01), Fiocco
patent: 3600296 (1971-08-01), Rieve
patent: 3716480 (1973-02-01), Finley et al.
patent: 4014780 (1977-03-01), McCoy
Knowlton Harold E.
Petrick Raymond A.
Chevron Research Company
Fisher Richard V.
Freeland, Jr. R. L.
Wasson G. W.
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