Engine oil formulations for biodiesel fuels

Patent metadata

Field	Value
Publication number	US-9540586-B2
Application number	US-201013378728-A
Country	US
Kind code	B2
Filing date	Jun 22, 2010
Priority date	Jun 26, 2009
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Oxidative degradation may be reduced in a lubricant composition which contains an oil of lubricating viscosity and at least about 1 percent by weight of a C1-C3 alkyl ester of a carboxylic acid of about 12 to about 24 carbon atoms, by including within the lubricant composition a sulfonate detergent in an amount sufficient to provide at least about 0.2 percent by weight sulfonate soap to the lubricant composition, wherein the weight ratio of sulfonate soap to phenate soap in the lubricant composition is at least about 0.35:1.

First claim

What is claimed is:

1. A method of reducing oxidative degradation of a lubricant composition which contains a mineral oil of lubricating viscosity and at least about 1 percent by weight of a C1-C4 alkyl ester of a carboxylic acid of about 12 to about 24 carbon atoms, comprising including within said lubricant composition
about 0.8 to about 2 percent by weight of one or more calcium or magnesium sulfonate detergents
said calcium or magnesium sulfonate detergents comprising at least one calcium or magnesium sulfonate detergent having a TBN of about 100 to less than 200, in an amount to deliver at least about 0.2 percent by weight sulfonate soap to the lubricant composition
and optionally at least one overbased sulfonate detergent having a TBN of 300 to about 750;
such that the total amount of sulfonate soap in the lubricant composition from all such sulfonate detergents is an amount sufficient to provide 0.5 to 2 percent by weight sulfonate soap to the lubricant composition,
along with a phenate detergent, wherein the weight ratio of sulfonate soap to phenate soap in the lubricant composition is at least about 0.7:1 and up to about 1.5:1,
said lubricant composition further comprising a succinimide dispersant.

2. The method of claim 1 wherein the presence of the C1-C4 alkyl ester of a carboxylic acid of about 12 to about 24 carbon atoms arises from dilution of the lubricant composition by a liquid fuel.

3. The method of claim 1 wherein the total amount of detergent soap in the lubricant composition is at least 1.0 percent by weight.

4. A method for lubricating a sump-lubricated internal combustion engine fueled by a liquid fuel which comprises a C1-C4 alkyl ester of a carboxylic acid of about 12 to about 24 carbon atoms, comprising supplying to the sump a lubricant comprising a mineral oil of lubricating viscosity and about 0.8 to about 2 percent by weight of one or more calcium or magnesium sulfonate detergents,
said calcium or magnesium sulfonate detergents comprising at least one calcium or magnesium sulfonate detergent having a TBN of about 100 to less than 200, in an amount to deliver at least about 0.2 percent by weight sulfonate soap to the lubricant composition
and optionally at least one overbased sulfonate detergent having a TBN of 300 to about 750;
such that the total amount of sulfonate soap in the lubricant composition from all such sulfonate detergents is an amount sufficient to provide 0.5 to 2 percent by weight sulfonate soap to the lubricant composition,
along with a phenate detergent, wherein the weight ratio of sulfonate soap to phenate soap in the lubricant composition is at least about 0.7:1 and up to about 1.5:1,
said lubricant composition further comprising a succinimide dispersant.

5. The method of claim 1 wherein the alkyl ester comprises a methyl ester of a fatty acid derived from an animal or vegetable source.

6. The method of claim 4 wherein the liquid fuel comprises at least about 2 percent by weight of the alkyl ester.

7. The method of claim 4 wherein a portion of the alkyl ester has accumulated in the lubricant.

8. The method of claim 4 wherein the liquid fuel further comprises a middle distillate fuel.

9. The method of claim 1 wherein the sulfonate detergent comprises an overbased calcium sulfonate detergent.

10. The method of claim 1 wherein the lubricant comprises about 1 to about 10 weight percent of the succinimide dispersant.

11. A lubricant composition comprising
(a) a mineral oil of lubricating viscosity;
(b) at least about 1 percent by weight of a C1-C4 alkyl ester of a carboxylic acid of about 12 to about 24 carbon atoms; and
(c) about 0.8 to about 2 percent by weight of one or more calcium or magnesium sulfonate detergents, said calcium or magnesium sulfonate detergents comprising at least one calcium or magnesium sulfonate detergent having a TBN of about 100 to less than 200, in an amount to deliver at least about 0.2 percent by weight sulfonate soap to the lubricant composition
and optionally at least one overbased sulfonate detergent having a TBN of 300 to about 750;
such that the total amount of sulfonate soap in the lubricant composition from all such sulfonate detergents is in an amount sufficient to provide 0.5 to 2 percent by weight sulfonate soap to the lubricant composition,
(d) a phenate detergent

wherein the weight ratio of sulfonate soap to phenate soap in the lubricant composition is at least about 0.7:1 and up to about 1.5:1, and
(e) a succinimide dispersant.

12. The lubricant of claim 11 wherein the presence of the alkyl ester arises from dilution of the lubricant by a liquid fuel.

13. The lubricant of claim 11 wherein the alkyl ester comprises a methyl ester of a fatty acid derived from an animal or vegetable source.

14. The lubricant of claim 11 wherein the sulfonate detergent comprises an overbased calcium sulfonate.

15. The lubricant of claim 11 comprising about 1 to about 10 weight percent of the succinimide dispersant.

16. The lubricant of claim 14 further comprising a sodium or magnesium sulfonate detergent.

17. The lubricant composition of claim 11 wherein the alkyl ester comprises a methyl ester of a fatty acid derived from an animal or vegetable source, the sulfonate detergent comprises an overbased calcium sulfonate, and wherein the lubricant composition comprises about 1 to about 10 weight percent of the succinimide dispersant.

18. The lubricant composition of claim 11 wherein the weight ratio of sulfonate soap to phenate soap in the lubricant composition is about 1.2:1 to about 1.5:1.

Assignees

• Jones Craig
• Adamczewska Jola Z
• Davies Mark C
• Lubrizol Corp

Inventors

• Jones Craig
• Adamczewska Jola Z
• Davies Mark C

Classifications

• C10N2030/78

  Fuel contamination · CPC title

• C10N2030/52

  Base number [TBN] · CPC title

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10N2010/02

  Groups 1 or 11 · CPC title

• C10N2040/252

  Diesel engines · CPC title