C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/58
C10G 11/00 (2006.01) C10G 1/04 (2006.01)
Patent
CA 1127577
S P E C I F I C A T I O N TO ALL WHOM IT MAY CONCERN: BE IT KNOWN that we, HAROLD E. KNOWLTON and RAYMOND A. PETRICK, citizens of the United States of America and residents, respectively, of Moraga, County of Contra Costa, State of California, and Ocean Springs, County of Jackson, State of Mississippi, have invented new and useful improvements in CLEANING METHOD FOR REFINING PROCESS RUNDOWN TANK of which the following is a specification: ABSTRACT OF THE DISCLOSURE 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 pumping means. After the floating oil-solid mixture has been separated by the sol- vent, the solvent and liquid are removed from the tank, separated and recycled to process streams. The remaining settled solid sedi- ments may then be washed with an aqueous solution circulated in the tank with the adjustable pumping means to water-wash addi- tional 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 totally from outside of the tank. -1-
329889
Knowlton Harold E.
Petrick Raymond A.
Chevron Research And Technology Company
Smart & Biggar
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