Composition and method for preventing or reducing engine knock and pre-ignition in high compression spark ignition engines

Patent metadata

Field	Value
Publication number	US-2016348028-A1
Application number	US-201615161718-A
Country	US
Kind code	A1
Filing date	May 23, 2016
Priority date	May 28, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A lubricant composition for high compression spark ignition engines that contains at least one bismuth-containing compound (e.g., a bismuth salt of a carboxylic acid). A method for preventing or reducing engine knock and pre-ignition in an engine lubricated with a formulated oil. The formulated oil has a composition including at least one bismuth-containing compound (e.g., a bismuth salt of a carboxylic acid). A fuel composition for high compression spark ignition engines that contains at least one bismuth-containing compound (e.g., a bismuth salt of a carboxylic acid). A method for preventing or reducing engine knock and pre-ignition in an engine by using a fuel additive composition in a gasoline fuel composition. The fuel additive composition contains at least one bismuth-containing compound (e.g., a bismuth salt of a carboxylic acid). The lubricating oils of this disclosure are useful as passenger vehicle engine oil (PVEO) products.

First claim

What is claimed is:

1 . A method for preventing or reducing engine knock or pre-ignition in a high compression spark ignition engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising from 0.1 to 10 mass % of at least one bismuth-containing compound, based on the total weight of the lubricating oil.

2 . The method of claim 1 wherein the at least one bismuth-containing compound comprises a bismuth salt of an aliphatic carboxylic acid, a bismuth salt of a cycloaliphatic carboxylic acid, a bismuth salt of an aromatic carboxylic acid, a bismuth carbamate, a bismuth phosphate, a bismuth salicylate, a bismuth sulfonate, a bismuth phenate, or mixtures thereof.

3 . The method of claim 1 wherein the at least one bismuth-containing compound comprises a bismuth salt of a substituted or unsubstituted, saturated or unsaturated, monocarboxylic acid or polycarboxylic acid, or mixtures thereof.

4 . The method of claim 2 wherein the aliphatic carboxylic acid is selected from the group consisting of methanoic acid, ethanoic acid, propanoic acid, butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic acid, icosanoic acid, and mixtures thereof.

5 . The method of claim 2 wherein the cycloaliphatic carboxylic acid is selected from the group consisting of a monocyclic carboxylic acid, a bicyclic carboxylic acid, a tricyclic carboxylic acid, a tetracyclic carboxylic acid, and mixtures thereof.

6 . The method of claim 2 wherein the aromatic carboxylic acid is selected from the group consisting of benzoic acid, salicylic acid, phenyl alkanoic acid, a multi-ring aromatic acid, and mixtures thereof.

7 . The method of claim 1 wherein the at least one bismuth-containing compound is selected from the group consisting of bismuth neododecanoate, bismuth naphthenate, and mixtures thereof.

8 . The method of claim 1 wherein at least one bismuth-containing compound is present in an amount sufficient to provide from 50 to 4000 parts per million (ppm) of bismuth in the lubricating oil.

9 . The method of claim 1 wherein at least one bismuth-containing compound is present in an amount sufficient to provide from 200 to 2000 parts per million (ppm) of bismuth in the lubricating oil.

10 . The method of claim 1 wherein the lubricating oil further comprises from 80 to 99 mass % of at least one branched hydrocarbon having greater than 20 carbon atoms and having at least 25% of the carbons in the form of methyl groups.

11 . The method of claim 10 wherein the at least one branched hydrocarbon comprises at least one poly(branched alkene) or at least one branched alkane or at least one branched alkene.

12 . The method of claim 11 wherein the at least one poly(branched alkene) is derived from a C4 to C20 branched alkene, a C20 to C54 branched alkene, polyisobutene, hydrogenated polyisobutene, or squalene.

13 . The method of claim 11 wherein the at least one branched alkane comprises a C20 to C54 branched alkane or isoeicosane.

14 . The method of claim 1 wherein the lubricating oil comprises a Group I, Group II, Group III, Group IV, Group V base oil, or mixtures thereof.

15 . The method of claim 1 wherein the lubricating oil further comprises one or more of a detergent, dispersant, antiwear agent, viscosity index improver, antioxidant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, anti-rust additive, and friction modifier.

16 . The method of claim 1 wherein the lubricating oil, when 5% of which is added to isooctane, maintains at least 80% of the isooctane ignition or combustion delays, using the equipment and test conditions as determined by ASTM D7668.

17 . The method of claim 1 wherein the high compression spark ignition engine has a compression ratio of at least 13.

18 . The method of claim 1 wherein the high compression spark ignition engine has a compression ratio of at least 15.

19 . The method of claim 1 wherein the high compression spark ignition engine is a super-charged engine or a turbo-charged engine.

20 . The method of claim 1 wherein the lubricating oil is used with a gasoline fuel with Research Octane Number (RON) or Motor Octane Number (MON) higher than 95.

21 . The method of claim 1 wherein the lubricating oil is used with a gasoline fuel comprising essentially isooctane.

22 . The method of claim 1 wherein the pre-ignition is low speed pre-ignition (LSPI).

23 . A method for preventing or reducing engine knock or pre-ignition in a high compression spark ignition engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising, based on the total weight of the lubricating oil, from 0.1 to 10 mass % of at least one bismuth-containing compound, and from 80 to 99 mass % of at least one branched hydrocarbon having greater than 20 carbon atoms and having at least 25% of the carbons in the form of methyl groups.

24 . The method of claim 23 wherein the at least one bismuth-containing compound comprises a bismuth salt of an aliphatic carboxylic acid, a bismuth salt of a cycloaliphatic carboxylic acid, a bismuth salt of an aromatic carboxylic acid, a bismuth carbamate, a bismuth phosphate, a bismuth salicylate, a bismuth sulfonate, a bismuth phenate, or mixtures thereof.

25 . A method for preventing or reducing engine knock or pre-ignition in a high compression spark ignition engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component; and at least one bismuth-containing compound, as a minor component.

26 . The method of claim 25 wherein the at least one bismuth-containing compound comprises a bismuth salt of an aliphatic carboxylic acid, a bismuth salt of a cycloaliphatic carboxylic acid, a bismuth salt of an aromatic carboxylic acid, a bismuth carbamate, a bismuth phosphate, a bismuth salicylate, a bismuth sulfonate, a bismuth phenate, or mixtures thereof.

27 . A lubricating engine oil for high compression spark ignition engine having a composition comprising from 0.1 to 10 mass % of at least one bismuth-containing compound.

28 . The lubricating engine oil of claim 27 wherein the at least one bismuth-containing compound comprises a bismuth salt of an aliphatic carboxylic acid, a bismuth salt of a cycloaliphatic carboxylic acid, a bismuth salt of an aromatic carboxylic acid, a bismuth carbamate, a bismuth phosphate, a bismuth salicylate, a bismuth sulfonate, a bismuth phenate, or mixtures thereof.

29 . The lubricating engine oil of claim 27 wherein at least one bismuth-containing compound is present in an amount sufficient to provide from 50 to 4000 parts per million (ppm) of bismuth in the lubricating oil.

30 . The lubricating engine oil of claim 27 wherein at least one bismuth-containing compound is present in an amount sufficient to provide from 200 to 2000 parts per million (ppm) of bismuth in the lubricating oil.

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Gao Jason Z
• Choi Eugine
• Boland Matthew W
• Salvi Luca

Classifications

• C10M2207/142

  polycarboxylic · CPC title

• C10M2207/127

  polycarboxylic · CPC title

• C10M137/10

  Thio derivatives · CPC title

• C10M135/18

  thiocarbamic type, e.g. containing the groups [IMAGE cpc-sch-C10M-1027.gif] · CPC title

• C10M129/46

  cycloaliphatic · CPC title