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Low sulfur and low phosphorus lubricating oil composition

a phosphorus and lubricating oil technology, applied in the petroleum industry, lubricant compositions, additives, etc., can solve the problems of low cylinder liner wear level, phosphorus was expected to provide no wear protection whatsoever, so as to achieve the effect of low temperature fluidity of lubricating oil

Inactive Publication Date: 2007-05-17
CHEVRON ORONITE CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a low sulfur and low phosphorus lubricating oil composition that is suitable for use in internal combustion engines. The composition is free of zinc di-alkyl di-thiophosphates and contains no more than 0.1 weight percent sulfur and no more than 0.1 weight percent phosphorus. The composition also contains a dispersant, an anti-oxidant, and a detergent. The dispersant is preferably an ashless dispersant, such as alkenyl succinimides or succinamides, which can be further modified by reaction with, for example, boron or ethylene carbonate. The anti-oxidant can be an ester of thiodicarboxylic acid, a di-thiocarbamate, or a molybdenum compound. The detergent can be a borated dispersant or a combination of a borated dispersant and a non-borated dispersant. The composition has a low sulfated ash content and a low phosphorus content. The invention also provides a method for lubricating internal combustion engines with the low sulfur and low phosphorus lubricating oil composition.

Problems solved by technology

Some of these systems have proven to be sensitive to the combustion products of the fuel and lubricant used in the engine.
Lubricating oils with no phosphorus were expected to provide no wear protection whatsoever.
Wear measurements were performed with these experimental lubricating oils in a diesel engine and the results showed unexpectedly low cylinder liner wear levels.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0158] Comparative Formulation A and Test Formulation B contained two dispersants, two anti-oxidants, a low overbased and a high overbased sulfonate, a corrosion inhibitor and an anti-foaming agent. Base oil was used to make-up a 100 percent of each of Comparative Formulation A and Test Formulation B.

[0159] The anti-wear performance of Test Formulation B was compared with Comparative Formulation A which contained zinc di-alkyl di-thiophosphate in addition to the other components given above. The degree of wear control with Test Formulation B was determined as a reduction in cylinder liner wear compared with Comparative Formulation A.

[0160] Comparative Formulation A and Test Formulation B are described in more detail in Table II below. The amounts of the components in the lubricating oil formulations are given in Table II in weight percent active additive.

TABLE IIFormulation(weight %)ComponentComparative Formulation ATest formulation BBase OilBorated Dispersant1.01.0Non-borated5....

example 2

Cylinder Liner Wear Test

[0162] The anti-wear control of Test Formulation B was compared to Comparative Formulation A was evaluated as described below.

[0163] Wear measurements were performed in a Mack Diesel Engine, installed in an engine test laboratory. The engine stand configuration was in conformance to the Mack T-10 engine test procedure known as ASTM Test Method D-6987. In addition, the engine was equipped with radiated cylinder liners and a system to circulate the engine lubricant through an external reservoir. A detector was placed in the reservoir to count the gamma-rays from the oil being circulated past the detector. The increase in the gamma-ray count over a fixed period of time is a measure of the amount of metal weight loss from the radiated area, in this case the cylinder liner area around the top ring reversal point.

[0164] The data reported were measured wear at the end of the test. The results of the Cylinder Liner Wear Test are summarized in Table IV below.

TABL...

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Abstract

The present invention is directed to a low sulfur and low phosphorus lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity and (b) one or more dispersants (c) one or more anti-oxidants and (d) one or more detergents, wherein the lubricating oil composition is essentially free of zinc di-alkyl di-thiophosphates and contains no more than 0.1 weight percent sulfur and provided the lubricating oil composition does not contain alkylated and non-alkylated aromatic amines and tri-nuclear molybdenum compounds. The present invention is also directed to a low sulfur and low phosphorus lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a borated dispersant and a non-borated dispersant (c) a molybdenum anti-oxidant and a phenolic anti-oxidant and (d) a high overbased and a low overbased calcium sulfonate, wherein the lubricating oil composition is essentially free of zinc di-alkyl di-thiophosphates and contains no more than 0.1 weight percent sulfur and provided the lubricating oil composition does not contain alkylated and non-alkylated aromatic amines and tri-nuclear molybdenum compounds. The present invention is also directed to method for lubricating internal combustion engines, which comprises lubricating the engine with a low sulfur and low phosphorus lubricating oil compositions of the present invention.

Description

FIELD OF THE INVENTION [0001] The present invention is directed to a low sulfur and low phosphorus lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity and (b) one or more dispersants (c) one or more anti-oxidants and (d) one or more detergents, wherein the lubricating oil composition is essentially free of zinc di-alkyl di-thiophosphates and contains no more than 0.1 weight percent sulfur and provided the lubricating oil composition does not contain alkylated and non-alkylated aromatic amines and tri-nuclear molybdenum compounds. The present invention is also directed to a low sulfur and low phosphorus lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a borated dispersant and a non-borated dispersant (c) a molybdenum anti-oxidant and a phenolic anti-oxidant and (d) a high overbased and a low overbased calcium sulfonate, wherein the lubricating oil composition is essentially free of zinc di-alkyl di-thiophosphates ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M135/36
CPCC10M163/00C10M2207/026C10M2207/028C10M2215/28C10M2219/046C10M2219/068C10N2230/40C10N2230/42C10N2230/43C10N2240/102C10N2260/14C10N2030/40C10N2030/42C10N2030/43C10N2040/252C10N2060/14
Inventor VAN DAM, WILLEM
Owner CHEVRON ORONITE CO LLC
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