Raymond H Petrick

US Patent:

42060010, Jun 3, 1980

Filed:

Jun 30, 1978

Appl. No.:

5/920917

Inventors:

Harold E. Knowlton - Moraga CA
Raymond A. Petrick - Ocean Springs MS

Assignee:

Chevron Research Company - San Francisco CA

International Classification:

B08B 308
B08B 310
B08B 908

US Classification:

134 12

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.