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Marine engine lubrication

A technology of engine and lubricating oil composition, which is applied in the direction of lubricating composition, additives, petroleum industry, etc., and can solve the problems of unresolved heavy fuel oil, etc.

Inactive Publication Date: 2012-02-29
INFINEUM INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it does not address the presence of heavy fuel oil in the composition

Method used

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  • Marine engine lubrication
  • Marine engine lubrication
  • Marine engine lubrication

Examples

Experimental program
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Effect test

Embodiment

[0113] The invention is illustrated by, but by no means limited to, the following examples.

[0114] components

[0115] Use the following components:

[0116] Component (A):

[0117] (A1) Calcium salicylate detergent having a TBN of 350 (alkalinity index of 2 or greater; degree of carbonation of 80% or greater)

[0118] (A2) Calcium salicylate detergent having a TBN of 225 (alkalinity index of 2 or more; degree of carbonation of less than 80%)

[0119] (A3) TBN is a calcium salicylate detergent of 65 (alkalinity index is less than 2; degree of carbonation is less than 80%)

[0120] Component (B):

[0121] Polyisobutylene succinic anhydride (“PIBSA”) derived from polyisobutylene having a number average molecular weight of 950 (72% active ingredient)

[0122] Base Oil II: API Group II 600R base stock from Chevron

[0123] Base Oil III: API Group III base oil known as XHV 182

[0124] Base Oil IV(1): API Group IV base oil known as DURASYN82

[0125] Base Oil IV(2): API G...

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Abstract

Trunk piston marine engine lubrication, when the engine is fueled by heavy fuel oil, is effected by a composition comprising a major amount of an oil of lubricating viscosity containing at least 50 mass % of a basestock containing greater than or equal to 90% saturates and less than or equal to 0.03% sulphur or a mixture thereof, and respective minor amounts of an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent other than such a detergent having a basicity index of less than two and a degree of carbonation of 80% or greater and at least 1 mass % of a hydrocarbyl-substituted carboxylic acid, anhydride, ester or amide thereof. Asphaltene precipitation in the lubricant, caused by the presence of contaminant heavy fuel oil, is prevented or inhibited.

Description

field of invention [0001] The present invention relates to a trunk piston marine engine lubricating composition for medium speed four-stroke compression ignition (diesel) marine engines and the lubrication of such engines. Background of the invention [0002] Marine trunk piston engines typically run off-shore using heavy fuel oil ("HFO"). Heavy fuel oil is the heaviest fraction of petroleum distillates and contains a complex mixture of molecules including up to 15% asphaltenes, defined as being insoluble in excess aliphatic hydrocarbons such as heptane but soluble in aromatic solvents (such as toluene) in the fraction of petroleum distillates. Asphaltene can enter the engine lubricant as a pollutant via cylinders or fuel pumps and injectors, and asphaltene can then precipitate as "black paint" or "black sludge" in the engine. The presence of such carbonaceous deposits on the piston surface can act as an insulating layer, which can lead to the formation of cracks which the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10N10/04C10N30/04C10N40/25
CPCC10M169/045C10M2203/10C10M2203/1006C10M2203/1025C10M2205/0285C10M2207/126C10M2207/127C10M2207/129C10M2207/262C10M2207/282C10M2215/08C10M2215/28C10M2219/089C10N2030/04C10N2040/252C10N2010/04C10N2020/02C10M141/12C10M169/04
Inventor T·加纳L·格雷戈里J·哈特利P·瓦斯
Owner INFINEUM INT LTD
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