Lubricating oil for a diesel powered engine and method of operating a diesel powered engine
AssigneeShell Oil Company
InventorsRaymond Edward Paggi, Joseph Michael Russo, Kay Colapret, James Robert Macias, Krishna Rangraj Kaushik
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Abstract
A lubricating oil composition useful for a diesel-powered engine is provided that reduces NOx emissions level produced from a diesel-powered engine. The lubricating oil comprises a base oil and at least one oil-dispersible source of HNCO such as isocyanates. A method of operating the diesel powered engine using the lubricating oil is also provided.
Claims49
A lubricating oil composition useful for diesel engine comprising:
- a base oil;
- and
- at least one oil-dispersible source of HNCO in an amount effective to reduce NOx emission from a diesel engine compared to a lubricating oil without the source of HNCO.
A lubricating oil composition useful for diesel engine comprising:
- a base oil;
- and at least one isocyanate having sufficient volatility to degas from the lubricating oil composition under normal engine operating conditions in an amount effective to reduce NOx emission from a diesel engine compared to a lubricating oil without the isocyanate.
A method of operating a diesel engine comprising:
- introducing into the diesel engine a lubricating oil composition;
- and
- operating the engine,
- wherein the lubricating oil composition comprises a base oil;
- and at least one oil-dispersible source of HNCO in an amount effective to reduce NOx emission from a diesel engine compared to a lubricating oil without the source of HNCO.
A method of operating a diesel engine comprising:
- an engine body;
- a combustion chamber formed in the engine body for containing a mixture of fuel and air;
- a plurality of cylinders formed in the engine body;
- and a respective piston mounted in each of said plurality of cylinders for reciprocal movement through successive exhaust and intake strokes, each respective piston defining a combustion chamber for containing a mixture of fuel and air the method comprising:
- introducing, into the combustion chamber, diesel fuel and air;
- delivering a lubricating oil composition to said cylinders;
- compressing the diesel fuel in the combustion chamber to ignition with the piston thereby generating an exhaust gas containing NOx;
- wherein the lubricating oil composition comprises a base oil and at least one oil-dispersible source of HNCO.
A lubricating oil composition useful for diesel engine comprising:
- a base oil;
- and
- at least one isocyanate, represented by the formula:
- R—(N═C═O)x
- wherein R is a hydrocarbyl group having 4 to 30 carbon atoms, and x is an integer of 1 to 4, present in amount of at least about 0.1% by weight to about 5% weight based on the lubricating oil composition.
A method of operating a diesel engine comprising:
- an engine body;
- a combustion chamber formed in the engine body for containing a mixture of fuel and air;
- a plurality of cylinders formed in the engine body;
- and a respective piston mounted in each of said plurality of cylinders for reciprocal movement through successive exhaust and intake strokes, each respective piston defining a combustion chamber for containing a mixture of fuel and air the method comprising:
- introducing, into the combustion chamber, diesel fuel and air;
- delivering a lubricating oil composition to the cylinders;
- compressing the diesel fuel in the combustion chamber to ignition with the piston thereby producing an exhaust gas;
- wherein the lubricating oil composition comprises a base oil and at least one isocyanate, represented by the formula:
- R—(N═C═O)x
- wherein R is a hydrocarbyl group having 4 to 30 carbon atoms, and x is an integer of 1 to 4, present in amount of at least about 0.1% by weight to about 5% weight based on the lubricating oil composition.
Dependencies are inferred from the claim text.