High viscosity overbased sulfonate detergent and marine cylinder oils containing same
AssigneeCrompton Corporation
InventorsRonald J. Muir, Theo I. Eliades, Leonard Matthews
Life of this patent
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Abstract
An overbased calcium sulfonate detergent having a high viscosity is characterized by forming a clear solution in lubricating oil, having a TBN of about 400 or more, and having a viscosity of at least 180 mm2/s at 100° C. The high viscosity of the detergent allows for reduction in expensive high viscosity oil components of marine cylinder oils while maintaining selected TBN and viscosity parameters in the finished oil.
Claims32
An overbased calcium sulfonate detergent, the detergent forming a clear solution in lubricating oil, having a TBN of about 400 or more, and having a viscosity of at least 180 mm2/s at 100° C.
A process for preparing a high viscosity overbased calcium sulfonate comprising the steps of:
- providing a sulfonic acid to a reactor,
- adding a lime reactant to the reactor for neutralization and overbasing;
- adding a lower aliphatic C1 to C4 alcohol and a hydrocarbon solvent, to form a process mixture in the reactor,
- carbonating the process mixture by injecting carbon dioxide into the reactor,
- adding an oil to the process mixture to form a product mixture,
- clarifying the product mixture by removing any solids,
- removing water and any remaining hydrocarbons from the product mixture after clarification, and
- isolating an overbased calcium sulfonate having a TBN of at least 400, wherein,
- during carbonation the exotherm of the reaction is maintained at a temperature between 27° and 57° C.
A marine cylinder oil composition comprising a mixture of at least two oils, a first of said two oils having a viscosity at least 170 mm2/s at 40° C. higher than a second oil, and an overbased detergent component, the composition having a TBN of 50-90 and being substantially free of viscosity index improvers, and the detergent component comprising an overbased calcium sulfonate having a viscosity of at least 180 mm2/s at 100° C. and a TBN of about 400 or more.
A marine cylinder oil comprising
- a low viscosity oil present in an amount of about 40 to about 45 wt. % based on a total amount of said marine cylinder oil;
- a high viscosity oil, said high viscosity oil having a viscosity at least 170 mm2/s at 40° C. greater than said low viscosity oil present in an amount of about 32 to about 39 wt. % based on a total amount of said marine cylinder oil;
- and
- a high viscosity overbased calcium sulfonate detergent having a viscosity of about 260 mm2/s at 100° C. present in an amount of about 8 to about 9 wt. % based on a total amount of said marine cylinder oil, said high viscosity overbased sulfonate detergent having a TBN of more than 400,
- wherein a total base number of said marine cylinder oil is about 50 to about 90 and said marine cylinder oil is substantially free of viscosity index improvers.
A marine cylinder oil comprising
- a low viscosity oil present in an amount of about 40 to about 45 wt. % based on a total amount of said marine cylinder oil;
- a high viscosity oil, said high viscosity oil having a viscosity at least 170 mm2/s at 40° C. greater than said low viscosity oil present in an amount of about 32 to about 39 wt. % based on a total amount of said marine cylinder oil;
- a high viscosity overbased calcium sulfonate detergent having a viscosity of about 314 mm2/s at 100° C. present in an amount of about 8 to about 9 wt. % based on a total amount of said marine cylinder oil, said high viscosity overbased sulfonate detergent having a TBN of more than 400,
- wherein a total base number of said marine cylinder oil is about 50 to about 90 and said marine cylinder oil is substantially free of viscosity index improvers.
Dependencies are inferred from the claim text.