Solvent extraction process for rerefining used lubricating oil
In accordance with the present invention, a process is provided for removing impurities from heavy and light lube oil fractions that have been obtained from waste lubricating oil. The impurities in the light lube oil fraction are removed utilizing tetrahydrofurfuryl alcohol in an extraction column (10). An oilrich raffinate has the solvent removed therefrom by steam distillation and stripping at reduced pressure in a distillation tower (20). The heavy lube oil fraction is purified in a manner similar to the purification of the light lube oil fraction. The finished heavy and light lube oil may then be subjected to further treatment, such as polishing steps or additives may be blended into the lube oil product depending on the desired use.
- Assignee:
- Delta Central Refining Inc
- Patent Number(s):
- US 4302325
- OSTI ID:
- 5958774
- Country of Publication:
- United States
- Language:
- English
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Method of rerefining used lubricating oil
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Related Subjects
020800* -- Petroleum-- Waste Management
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
EXTRACTION
IMPURITIES
LUBRICANTS
LUBRICATING OILS
MANAGEMENT
OILS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PROCESSING
RECYCLING
SEPARATION PROCESSES
SOLVENT EXTRACTION
WASTE MANAGEMENT
WASTE OILS
WASTE PROCESSING