Reclaiming used lubricating oils

Details Reclaiming used lubricating oils Reclaiming used lubricating oils

C - Chemistry, Metallurgy

10

M

196/202

C10M 175/00 (2006.01) F02B 3/06 (2006.01)

Patent

CA 1142121

28234 Abstract of the Disclosure A process for the reclaiming of used lubricating oils, particu- larly mixtures containing used oil from diesel engine crank cases, is pro- vided to facilitate the separation of an oil phase from residual product in the production of an intermediate low-ash oil or a high-grade lube oil stock which method comprises: (a) contacting the used oil with an aqueous ammonium salt treating agent in the presence of a polyhydroxy compound, (b) removing a major portion of water, and (c) separating the oil phase from the resultant residual product. Optionally, (d) recovering the low- ash product of step (c) for use as a fuel oil, in grease formulations, or in the preparation of lubricating oil formulations. Optionally, the low- ash product of step (d) is (e) subjected to hydrotreating and thereafter (f) stripped.

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