Process for preparing lubricating oil from used waste lubricating oil

Patent · Tue Feb 14 04:00:00 EST 1978

OSTI ID:6924427

Whisman, M L; Reynolds, J W; Goetzinger, J W; Cotton, F O

A re-refining process is described by which high-quality finished lubricating oils are prepared from used waste lubricating and crankcase oils. The used oils are stripped of water and low-boiling contaminants by vacuum distillation and then dissolved in a solvent of 1-butanol, 2-propanol, and methylethyl ketone, which precipitates a sludge containing most of the solid and liquid contaminants, unspent additives, and oxidation products present in the used oil. After separating the purified oil-solvent mixture from the sludge and recovering the solvent for recycling, the purified oil is preferably fractional vacuum-distilled, forming lubricating oil distillate fractions which are then decolorized and deodorized to prepare blending stocks. The blending stocks are blended to obtain a lubricating oil base of appropriate viscosity before being mixed with an appropriate additive package to form the finished lubricating oil product.

• Assignee: Dept. of Energy
• Patent Number(s): US 4073719
• OSTI ID: 6924427
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020800* -- Petroleum-- Waste Management
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
ALCOHOLS
BUTANOLS
CORROSION PRODUCTS
DISTILLATION
DRYING
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
KETONES
LOW PRESSURE
LUBRICANTS
LUBRICATING OILS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
PRODUCTION
PROPANOLS
RECOVERY
RECYCLING
REMOVAL
SEPARATION PROCESSES
SOLVENTS
WASTE OILS
WATER