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US 2016/0237371 A1Published application
Low Sulfur Marine Distillate Fuel Trunk Piston Engine Oil Composition
AssigneeChevron Oronite Technology B.V.
InventorWilhelmus Petrus Antonie Van Houten
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Abstract
The present invention generally relates to a trunk piston engine oil composition designed for use with low sulfur distillate fuel where the lubricating oil has a low base number but is capable of providing oxidative stability, viscosity increase control, and improved detergency performance. The present invention also generally relates to a method for lubricating a trunk piston engine and a method for operating a trunk piston engine using said trunk piston engine oil composition.
Claims20
A low sulfur marine distillate fuel trunk piston diesel engine lubricating oil composition comprising:
- (a) a major amount of a Group II base oil;
- (b) a detergent composition comprising:
- (i) a medium overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C20 or greater, and wherein the TBN of the medium overbased detergent on an actives basis is from about 100 to 300 mg KOH/g;
- (ii) a high overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C20 or greater, and wherein the TBN of the high overbased detergent on an actives basis is greater than about 300 mg KOH/g;
- and
- (iii) a non-overbased sulfurized alkylphenate detergent which is substantially free of polyol promoter oxidation products;
- and which is prepared by the process comprising:
- contacting an alkylphenol having at least one alkyl substituent from 6 to 36 carbon atoms with sulfur, in the presence of a promoter acid selected from the group of alkanoic acids having 1 through 3 carbon atoms, mixtures of the alkanoic acids, alkaline earth metal salts of the alkanoic acids and mixtures thereof, and at least a stoichiometric amount of a calcium base sufficient to neutralize the alkylphenol and the promoter at a temperature of from about 130° C. to about 250° C. under reactive conditions in the absence of a polyol promoter or an alkanol having 1 to 5 carbon atoms for a sufficient period of time to react essentially all of the sulfur thereby yielding a calcium sulfurized alkylphenate essentially free of elemental sulfur,
- wherein the ratio of weight % medium overbased detergent (i) to weight % high overbased detergent (ii) is from about 0.1:1 to 10:1;
- wherein the TBN of the composition is less than 30 mg KOH/g;
- and
- wherein the composition does not contain an overbased detergent comprising a salt of an alkyl-substituted hydroxybenzoic acid having at least 50 mole % of alkyl groups that are C14-C18.
9 more elements
A method for operating a trunk piston engine comprising:
- (a) fueling the engine with a low sulfur marine distillate fuel, and
- (b) lubricating the engine with a lubricating oil composition comprising:
- (1) a major amount of a Group II base oil;
- (2) a detergent composition comprising:
- (i) a medium overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C20 or greater, and wherein the TBN of the medium overbased detergent on an actives basis is from about 100 to 300 mg KOH/g;
- (ii) a high overbased detergent comprising an overbased salt of a linear alkyl-substituted hydroxybenzoic acid, wherein at least 90 mole % of the alkyl groups are C20 or greater, and wherein the TBN of the high overbased detergent on an actives basis is greater than about 300 mg KOH/g;
- and
- (iii) a non-overbased sulfurized alkylphenate detergent which is substantially free of polyol promoter oxidation products;
- and which is prepared by the process comprising:
- contacting an alkylphenol having at least one alkyl substituent from 6 to 36 carbon atoms with sulfur, in the presence of a promoter acid selected from the group of alkanoic acids having 1 through 3 carbon atoms, mixtures of the alkanoic acids, alkaline earth metal salts of the alkanoic acids and mixtures thereof, and at least a stoichiometric amount of a calcium base sufficient to neutralize the alkylphenol and the promoter at a temperature of from about 130° C. to about 250° C. under reactive conditions in the absence of a polyol promoter or an alkanol having 1 to 5 carbon atoms for a sufficient period of time to react essentially all of the sulfur thereby yielding a calcium sulfurized alkylphenate essentially free of elemental sulfur,
- wherein the ratio of weight % medium overbased detergent (i) to weight % high overbased detergent (ii) is from about 0.1:1 to 10:1;
- wherein the TBN of the composition is less than 30 mg KOH/g;
- and
- wherein the composition does not contain an overbased detergent comprising a salt of an alkyl-substituted hydroxybenzoic acid having at least 50 mole % of alkyl groups that are C14-C18.
11 more elements
Dependencies are inferred from the claim text.