Process for preparing lubricating oil from used waste...

Details Process for preparing lubricating oil from used waste... Process for preparing lubricating oil from used waste...

C - Chemistry, Metallurgy

10

G

196/200

C10G 21/16 (2006.01) C10M 175/00 (2006.01)

Patent

CA 1100078

ABSTRACT OF THE DISCLOSURE A re-refining process is described by which high-quality finished lubricating oils are prepared from used waste lubri- cating 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 additves, and oxidation products present in the used oil. After sepa- rating 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. Advan- tages of the process include recovery of a higher percentage of waste oil, the formation of a by-product sludge that is essentially neutral and thus more environmentally compatible than are the sludges resulting from most other recovery pro- cesses, and reduced destruction of the diaromatic and poly- aromatic polar materials which impart natural lubricity and oxidation resistance to the oils. - 1 -

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