Process for recovery of oil from waste oil sludges
Patent
·
OSTI ID:6126719
This patent describes a process for the recovery of oil, useful for further processing as refinery feed stock, from waste oil sludge containing oil, water and at least 5% by weight solids, and from which the oil and water cannot be separated by mechanical means. It comprises: heating the sludge at a temperature sufficient to volatilize the oil and water in the sludge, and recovering solids free of oil and water, the solids being classified nonhazardous by EPA toxicity test procedure, condensing the oil and water; centrifuging the resulting condensate to separate oil from water and any entrained solids, recovering oil from the centrifuging for further refinery processing, and recovering water from the centrifuging whereby the water is sufficiently clean for further treatment in a conventional water treatment facility to lower the Chemical Oxygen Demand to an acceptable limit.
- Assignee:
- NOV; NOV-91-017099; EDB-92-010099
- Patent Number(s):
- A; US 4990237
- Application Number:
- PPN: US 7-313240
- OSTI ID:
- 6126719
- Country of Publication:
- United States
- Language:
- English
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