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Lubricating oil composition

a technology of lubricating oil and composition, applied in the direction of lubricant composition, liquid carbonaceous fuel, additives, etc., can solve the problems of sensitiveness and poisoning of oxidation catalysts, and achieve the effect of reducing catalyst poisoning

Inactive Publication Date: 2007-06-07
CHEVRON ORONITE CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] The present invention is directed to a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity (b) one or more lithium-containing detergents (c) one or more detergents other than a lithium-containing detergent (d) one or more anti-oxidants (e) one or more dispersants and (f) one or more anti-wear agents, wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium-containing detergents and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent. The present invention is also directed to a lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a lithium-containing detergent (c) a detergent other than a lithium-containing detergent (d) an amine-containing anti-oxidant (e) an ethylene carbonate treated dispersant and (f) a phosphorus-containing anti-wear agent, wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent. The present invention is also directed to a method for reducing catalyst poisoning in exhaust after treatment systems in internal combustion engines, which comprises operating the engine with the lubricating oil compositions of the present invention.

Problems solved by technology

Some of these systems have proven to be sensitive to the combustion products of the fuel and the lubricant used in the engine.
Lubricating oils with low phosphorus were expected to provide some wear protection, but they were also expected to poison the oxidation catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0099] Comparative Formulation A and Test Formulation B contained an amine-containing anti-oxidant, an ethylene carbonate treated dispersant, a phosphorus-containing anti-wear agent, a viscosity index improver and an anti-foaming agent. Comparative Formulation A also contained a calcium medium overbased sulfurized phenate and Test Formulation B contained a lithium medium overbased sulfurized phenate. Base oil was used to make-up a 100 percent of each of Comparative Formulation A and Test Formulation B.

[0100] The reduction in catalyst poisoning using Test Formulation B containing a lithium medium overbased sulfurized phenate in addition to the other components given above was compared with Comparative Formulation A which contained a calcium medium overbased sulfurized phenate in addition to the other components given above.

[0101] 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 form...

example 2

Catalyst Poisoning

[0103] Reduction in catalyst poisoning in exhaust after treatment systems was determined for Test Formulation B was compared to Comparative Formulation A as described below.

[0104] Catalyst poisoning was determined using a Honda E5 generator set that is equipped with a 0.3 liter, 2-cylinder, OHC engine. The catalyst core was under-sized the engine valve guides were removed to accelerate aging of the catalyst. The catalyst core was placed far enough down stream to prevent sintering. After aging of the catalyst, the core was measured for conversion efficiency and for deposited additive metals using the synthetic gas reactor.

[0105] The gas reactor was operated under three different conditions, lean, rich and perturbated. The perturbated condition most closely simulates the environment of the engine by alternating the gas mixture between lean and rich conditions. The experiment consisted of measurement of conversion efficiency of hydrocarbons, carbon monoxide and nit...

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Abstract

The present invention is directed to a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity (b) one or more lithium-containing detergents (c) one or more detergents other than a lithium-containing detergent (d) one or more anti-oxidants (e) one or more dispersants and (f) one or more anti-wear agents, wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium-containing detergents and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent. The present invention is also directed to a lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a lithium-containing detergent (c) a detergent other than a lithium-containing detergent (d) an amine-containing anti-oxidant (e) an ethylene carbonate treated dispersant and (f) a phosphorus-containing anti-wear agent, wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent. The present invention is also directed to method for reducing catalyst poisoning in exhaust after treatment systems in internal combustion engines, which comprises operating the engine with the lubricating oil compositions of the present invention.

Description

FIELD OF THE INVENTION [0001] The present invention is directed to a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity (b) one or more lithium-containing detergents (c) one or more detergents other than a lithium-containing detergent (d) one or more anti-oxidants (e) one or more dispersants and (f) one or more anti-wear agents, wherein the lubricating oil composition contains no more than 0.1 weight percent of lithium-containing detergents and no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a calcium-containing detergent. The present invention is also directed to a lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a lithium-containing detergent (c) a detergent other than a lithium-containing detergent (d) an amine-containing anti-oxidant (e) an ethylene carbonate treated dispersant and (f) a phosphorus-containing anti-wear agent, wherein the lubricating ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L1/22
CPCC10M163/00C10M2207/028C10M2207/26C10M2207/262C10M2219/087C10N2210/01C10N2210/02C10N2230/42C10N2230/43C10N2240/10C10M2215/064C10M2215/28C10M2223/045C10N2010/02C10N2010/04C10N2030/43C10N2030/42C10N2040/25
Inventor BOFFA, ALEXANDER B.MONTEZ, ALFREDO
Owner CHEVRON ORONITE CO LLC
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