Method of operating internal combustion engine by introducing antioxidant into combustion chamber

• US 20050115146A1
• Filed: 03/28/2003
• Published: 06/02/2005
• Est. Priority Date: 04/23/2002
• Status: Abandoned Application

• Current Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Original Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Inventors: Macduff, Malcolm G. J., Arters, David C., Jackson, Mitchell M, Mackney, Derek W.
• Application Number:
  US10/511,003
• Publication Number:
  US 20050115146A1
• Time in Patent Office: Days
• US Class Current: 44/450
• CPC Class Codes: C10L 1/14 Organic compounds
• CPC Class Codes: C10L 1/143 mixtures of organic macromolecular compounds with organic non-macromolecular compounds
• CPC Class Codes: C10L 1/1832 mono-hydroxy C10L1/1802, C10L1/1805, C10L1/1808, C10L1/1811, C10L1/1814, C10L1/1817, C10L1/1828 take precedence
• CPC Class Codes: C10L 1/1835 having at least two hydroxy substituted non condensed benzene rings C10L1/1802, C10L1/1805, C10L1/1808, C10L1/1811, C10L1/1814, C10L1/1817, C10L1/1828 take precedence
• CPC Class Codes: C10L 1/19 Esters ester radical containing compounds; ester ethers; carbonic acid esters C10L1/1802, C10L1/1805, C10L1/1808, C10L1/1811, C10L1/1814, C10L1/1817 take precedence
• CPC Class Codes: C10L 1/1981 Condensation polymers of aldehydes or ketones
• CPC Class Codes: C10L 1/223 having at least one amino group bound to an aromatic carbon atom C10L1/221, C10L1/2227 take precedence
• CPC Class Codes: C10L 10/00 Use of additives to fuels or fires for particular purposes additives for liquid carbonaceous fuels characterised by their chemical nature C10L1/10; using binders for briquetting solid fuels C10L5/10; using additives to improve the combustion of solid fuels C10L9/10
• CPC Class Codes: C10L 10/02 for reducing smoke development
• CPC Class Codes: C10L 10/08 for improving lubricity; for reducing wear

Abstract

In a method of operating an internal combustion engine, an antioxidant composition is introduced into a combustion chamber of the engine. The antioxidant composition contains (A) a sterically hindered phenol; (B) an alkylene or alkylidene coupled sterically hindered phenol oligomer; (C) a secondary aromatic amine; (D) a reaction product of a hydrocarbyl-substituted hydroxy-containing aromatic compound, an aldehyde, and a carboxyl-substituted phenol; or (E) a mixture thereof. The method improves the performance of a lubricating oil of the engine.

Claims

1. A method of operating an internal combustion engine, comprising:

introducing an antioxidant composition comprising

(A) a sterically hindered phenol;

(B) an alkylene or alkylidene coupled sterically hindered phenol oligomer;

(C) a secondary aromatic amine;

(D) a reaction product of a hydrocarbyl-substituted hydroxy-containing aromatic compound, an aldehyde, and a carboxyl-substituted phenol;

or

(E) a mixture thereof into a combustion chamber of the engine during the operation of the engine.

2. The method of claim 1 wherein the antioxidant composition is essentially free of sulfur and phosphorus.

3. The method of claim 1 wherein the antioxidant composition is introduced into the combustion chamber by injection from a dosing system or as a component of a fuel composition.

4. The method of claim 3 wherein the antioxidant composition is present in the fuel composition at 0.1 to 40,000 ppm by weight.

5. The method of claim 1 wherein the antioxidant composition (A) is a phenol having two or more alkyl substituents that contain 1 to 24 carbon atoms and that occupy the 2-position and 6-position of the phenolic ring.

6. The method of claim 1 wherein the antioxidant composition (B) is a methylene coupled phenol oligomer containing two or more phenolic rings wherein each phenolic ring is occupied at the 2-, 4- and 6-positions by an alkyl or arylalkyl group.

7. The method of claim 1 wherein the antioxidant composition (C) is a diarylamine containing one or more alkyl substituents wherein each substituent contains up to 16 carbon atoms.

8. The method of claim 1 wherein the antioxidant composition (D) is the reaction product of an alkylphenol, formaldehyde, and salicylic acid.

9. The method of claim 1 wherein the antioxidant further comprises one or more fuel additives.

10. A method of improving the performance of a lubricating oil of an internal combustion engine by operating the engine according to the method of claim 1.

11. The method of claim 10 wherein the engine is a compression-ignited engine or spark-ignited direct injection engine having an exhaust gas recirculation system.

12. The method of claim 10 wherein the engine is a compression-ignited or spark-ignited engine having an exhaust treatment device, and the lubricating oil has at least one of the properties selected from the group consisting of a phosphorus content below 0.1% by weight, a sulfur content below 0.5% by weight, and a sulfated ash content below 1.5% by weight.

13. The method of claim 10 wherein the engine is installed on a motor vehicle and has a recommended drain interval for the lubricating oil of the engine of greater than 6,000 miles.

14. The method of claim 10 wherein the engine is a stationary engine having a recommended drain interval for the lubricating oil of the engine of greater than 150 operational hours.

15. The method of claim 10 wherein the engine is a compression-ignited or spark-ignited engine having an exhaust treatment device, and a fuel of a fuel composition used to fuel the engine has a sulfur content below 80 ppm by weight.