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AssigneeTotal Raffinage Marketing
InventorsValérie Doyen, Denis Lancon, Jean-Marie Bourmaud, Florence Bredon
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The present invention for a two-stroke marine engine, which can be used with both high-sulphur content fuel oils and low-sulphur content fuel oils. It relates to a cylinder lubricant having a BN determined according to the standard ASTM D-2896 greater than or equal to 40 milligrams of potash per gram of lubricant, comprising a lubricant base stock for marine engines and at least one overbased detergent based on alkali metals or alkaline-earth metals, characterized in that it also contains a quantity of 0.01% to 10% preferably 0.1% to 2% by weight relative to the total weight of the lubricant, of one or more (A) compounds chosen from the primary, secondary or tertiary monoalcohols the alkyl or alkylene chain of which is saturated or unsaturated, linear or branched and comprises at least 12 carbon atoms. This lubricant has a sufficient neutralization capacity vis-à-vis the sulphuric acid formed during the combustion of high-sulphur fuel oils, while limiting the formation of deposits during the use of low-sulphur fuel oils.
A cylinder lubricant having a BN determined according to the standard ASTM D-2896 greater than or equal to 40 milligrams of potash per gram of lubricant, comprising a lubricant base stock for marine engines and at least one overbased detergent based on alkali metals or alkaline-earth metals, wherein it also contains a quantity of 0.01% to 10% by weight relative to the total weight of the lubricant, of one or more (A) compounds chosen from the primary, secondary or tertiary monoalcohols the alkyl or alkylene chain of which is saturated or unsaturated, linear or branched and comprises at least 12 carbon atoms.
A use comprising choosing one or more compounds from the primary, secondary or tertiary monoalcohols the alkyl or alkylene chain of which is saturated or unsaturated, linear or branched and comprises at least 12 carbon atoms, as surfactants in a cylinder lubricant having a BN, measured by the standard ASTM D-2896, greater than or equal to 40 milligrams of potash per gram of lubricant, in order to improve the effectiveness of said cylinder lubricant vis-à-vis the rate of neutralization of the sulphuric acid formed during the combustion of any type of fuel oils the sulphur content of which is less than 4.5% m/m in a two-stroke marine engine.
A concentrate rate of additives for a cylinder lubricant comprising a BN determined according to the standard ASTM D-2896 greater than or equal to 40 milligrams of potash per gram of lubricant, said concentrate comprising from 0.05% to 20%, preferably from 0.5% to 15%, by weight relative to the total weight of the additive concentrate, of one or more (A) compounds chosen from the primary, secondary or tertiary monoalcohols the alkyl or alkylene chain of which is saturated or unsaturated, linear or branched and comprises at least 12 carbon atoms.
A concentrate of additives for a cylinder lubricant comprising a BN determined according to the standard ASTM D-2896 greater than or equal to 40 milligrams of potash per gram of lubricant, said concentrate comprising from 15% to 80% by weight relative to the total weight of the additive concentrate, of one or more (A) compounds chosen from the primary, secondary or tertiary monoalcohols the alkyl or alkylene chain of which is saturated or unsaturated, linear or branched and comprises at least 12 carbon atoms.
Dependencies are inferred from the claim text.