Method of removing hydroperoxides from lubricating oils using sodium hydroxide and a metal thiophosphate
AssigneeExxon Research & Engineering Co.
InventorsHarold Shaub, Darrell W. Brownawell, Arthur DiBenedetto
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Abstract
NaOH can be used to remove hydroperoxides from a lubricating oil provided the oil contains a metal thiophosphate. This extends the useful life of the oil and the equipment being lubricated. In a preferred embodiment, the NaOH is immobilized within the lubrication system of an internal combustion engine.
Claims14
In a method of decomposing hydroperoxides present in a lubricating oil which comprises contacting the lubricating oil with a heterogenous hydroperoxide decomposer for a period of time sufficient to cause a reduction in the amount of hydroperoxides present in the oil, the hydroperoxide decomposer being immobilized when contacting the oil so as not to pass into the oil, the improvement which comprises adding a metal thiophosphate to the oil when the hydroperoxide decomposer is NaOH to obtain the reduction in hydroperoxides.
Dependencies are inferred from the claim text.