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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: 2007-06-21
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 lubricating oil composition that reduces catalyst poisoning in exhaust after treatment systems in internal combustion engines. The composition contains no more than 0.12 weight percent phosphorus and does not contain a di-alkyl carboxylate detergent. It also includes a mixture of potassium and calcium overbased detergents, one or more anti-oxidants, one or more derivatized succinimide dispersants, and one or more anti-wear agents. The ratio of potassium to calcium overbased detergent is preferably between about 0.5:1.0 to about 10:1.0. The concentration of potassium in the potassium overbased detergent is preferably between about 1.0 weight percent to about 10.0 weight percent based on the total weight of the potassium overbased detergent. The concentration of calcium in the calcium overbased detergent is preferably between about 1.0 weight percent to about 15.0 weight percent based on the total weight of the calcium overbased detergent. The phosphorus content of the lubricating oil composition is preferably between about 0.03 weight percent to about 0.12 weight percent based on the total weight of the lubricating oil composition. The medium overbased metal detergents that can be used in the lubricating oil composition include medium overbased alkylaryl sulfonates, mono-alkyl carboxylate / salicylates, sulfurized salicylates, or Mannich condensation products of alkylphenols, aldehydes, and amines.

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

[0113] Comparative Formulations A-C and Test Formulation D contained an amine-containing anti-oxidant, an ethylene carbonate treated succinimide 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, Comparative Formulation B contained a calcium overbased alkylaryl sulfonate, Comparative Formulation C contained a magnesium overbased alkylaryl sulfonate and Test Formulation D contained a mixture of a potassium medium overbased mono-alkyl carboxylate and a calcium overbased alkylaryl sulfonate in a ratio of 3.5 to 1.0. Base oil was used to make-up a 100 percent of each of Comparative Formulations A-C and Test Formulation D.

[0114] The reduction in catalyst poisoning using Test Formulation D containing a potassium medium overbased mono-alkyl carboxylate and an calcium medium overbased alkylaryl sulfonate in addition to the other components given ab...

example 2

Catalyst Poisoning

[0116] Reduction in catalyst poisoning in exhaust after treatment systems was determined for Test Formulation B was compared to Comparative Formulation A as described below.

[0117] 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.

[0118] 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) a mixture of a potassium overbased detergent and a calcium overbased detergent (c) one or more anti-oxidants (d) one or more derivatized succinimide dispersants and (e) one or more anti-wear agents, wherein the lubricating oil composition contains no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate. The present invention is also directed to a lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a mixture of a potassium overbased mono-alkyl carboxylate and a calcium overbased alkylaryl sulfonate (c) an amine-containing anti-oxidant (d) an ethylene carbonate treated succinimide dispersant and (e) a phosphorus-containing anti-wear agent, wherein the lubricating oil composition contains no more than 0.1 weight percent of potassium and no more than 0.12 weight percent phosphorus and provided the lubricating oil composition does not contain a di-alkyl carboxylate. 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) a mixture of a potassium overbased detergents and a calcium overbased detergent (c) one or more anti-oxidants (d) one or more derivatized succinimide dispersants and (e) one or more anti-wear agents, wherein the lubricating oil composition contains no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate detergent. The present invention is also directed to a lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a mixture of a potassium overbased mono-alkyl carboxylate and a calcium overbased alkylaryl sulfonate (c) one or more anti-oxidants (d) an ethylene carbonate treated succinimide dispersant and (e) one or more anti-wear agents, wherein the lubricating oil composition contains no more than 0.12 weight percent phosphoru...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L1/22
CPCC10M163/00C10M2207/26C10N2210/01C10N2210/02C10N2230/38C10N2230/42C10N2240/10C10M2219/046C10M2215/064C10M2223/045C10M2215/28C10N2010/02C10N2010/04C10N2040/25C10N2030/38C10N2030/42
Inventor BOFFA, ALEXANDER B.MONTEZ, ALFREDO
Owner CHEVRON ORONITE CO LLC
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