Low temperature performance lubricating oil detergents and...

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 169/04 (2006.01) C10M 129/10 (2006.01) C10M 129/50 (2006.01)

Patent

CA 2706346

A carboxylate detergent prepared by the process comprising (a) alkylating a hydroxyaromatic compound with at least one normal alpha olefin having from about 12 to about 30 carbon atoms per molecule that has been isomerized to obtain an isomerized alpha olefin having 15-98 wt% branching and a residual alpha olefin content of between from about 0.1 to about 30 wt%, thereby producing an alkylated hydroxyaromatic compound; (b) neutralizing the resulting alkylated hydroxyaromatic compound with an alkali metal base; (c) carbonating the alkali metal salt from step (b) with carbon dioxide; (d) acidifying the salt produced in step (c); and (e) overbasing the resulting alkylated hydroxyaromatic carboxylic acid.

L'invention concerne un détergent carboxylate préparé par le procédé consistant à (a) alkyler un composé hydroxyaromatique avec au moins une alpha-oléfine normale ayant d'environ 12 à environ 30 atomes de carbone par molécule qui a été isomérisée pour obtenir une alpha-oléfine isomérisée ayant 15-98 % en poids de ramification et une teneur en alpha-oléfine résiduelle comprise entre environ 0,1 et environ 30 % en poids, ce qui permet ainsi de produire un composé hydroxyaromatique alkylé; neutraliser le composé hydroxyaromatique alkylé ainsi obtenu avec une base de métal alcalin; (c) carbonater le sel de métal alcalin provenant de l'étape (b) avec du dioxyde de carbone; (d) acidifier le sel produit dans l'étape (c); et (e) basifier en excès l'acide carboxylique hydroxyaromatique alkylé ainsi obtenu.

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