Process for preparing lubricating oil from used waste lubricating oil
- Bartlesville, OK
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.
- Research Organization:
- BETC/ERDA
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4073719
- OSTI ID:
- 863012
- Country of Publication:
- United States
- Language:
- English
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1-butanol
2-propanol
additive
additives
appropriate
base
blended
blending
containing
contaminants
crankcase
decolorized
deodorized
described
dissolved
distillate
distillate fraction
distillate fractions
distillation
finished
form
forming
fractional
fractions
high-quality
ketone
liquid
liquid contaminants
low-boiling
lubricating
lubricating oil
lubricating oils
methylethyl
mixed
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oil
oil product
oil-solvent
oils
oxidation
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oxidation products
package
precipitates
preferably
prepare
prepared
preparing
process
product
products
purified
re-refining
recovering
recycling
refining process
separating
sludge
solid
solvent
solvent mixture
stocks
stripped
unspent
vacuum
vacuum distillation
vacuum-distilled
viscosity
waste
waste lubricating
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