De-ashing lubricating oils

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 19/02 (2006.01) C10G 29/00 (2006.01) C10M 175/00 (2006.01)

Patent

CA 1144100

DE-ASHNG LUBRICATING OILS Abstract of the Disclosure A process for the production of an essentially ash-free oil stock from a lubricating oil containing ash-forming components comprising (a) contacting said lubricating oil with an aqueous ammonium salt treating agent; (b) removing a major portion of the water from the mixture resulting from combining said aqueous solution and said lubricating oil; (c) heating at least a portion of the product resulting from step (b) at a temperature in the range of about 320° to about 420°C for a period of time sufficient to decompose at least a portion of any ammonium salts of sulfonic acid and dialkyldithiophosphoric acid that are contained therein; (d) cooling the product from step (c) to a temperature in the range of about 150° to about 180°C; and (e) separating the solids from the product of step (d), optionally with subsequent hydrotreating and stripping of the oil thus obtained.

358068

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