Process for the recovery of oil from waste oil sludges

Details Process for the recovery of oil from waste oil sludges Process for the recovery of oil from waste oil sludges

C - Chemistry, Metallurgy

10

G

C10G 17/00 (2006.01) C10G 31/00 (2006.01) C10G 31/10 (2006.01) C10G 33/06 (2006.01) C10G 53/02 (2006.01) C10M 175/00 (2006.01)

Patent

CA 2092926

2092926 9204424 PCTABS00011 Commercially valuable oil is recovered from refinery-produced, Resource Conservation and Recovery Act classified, hazardous waste oil sludges by a series of volatilizing and condensing steps (which may vary depending on the oil, water, and solids content of the sludge) resulting in the production of nonhazardous water and solid waste by products. A pumpable, low viscosity, high oil- and/or water-contentsludge (10) is first centrifuged (14) to separate free oil and water (16), while the thick waste oil sludge, centrifuge solids, or other sludges low in oil and/or water content are heated in a volatizer (24) to volatilize the contained water and oil. Dry, friable, deoiled solids are recycled with the oily sludge feed to prevent material agglomeration and heat exchanger fouling. Oil and water vapor from the high-temperature volatilization apparatus is recycled as an indirect heat source to the low-temperature volatilization apparatus. The volatilized oil and water are condensed and combined with the oil and water centrate, and the oil and water are essentially separated as by gravity in a settler. The separated oil is again centrifuged to remove any entrained water and solids. The nearly oil free, nonhazardous waste water and nonhazardous, deoiled solids can be disposed of in a conventional manner, and the commercially valuable recovered oil is suitable for further refinery processing.

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