Back to results
US 8,452,548 B2Granted
Base oil low temperature property classification model
AssigneeExxonMobil Research and Engineering Company
InventorsRonald M. Gould, Eugine Choi
Life of this patent
Estimating the term…
Abstract
In one embodiment a method to determine at least one low temperature property of the lubricant oil is disclosed. This method comprises obtaining a base stock, generating a DSC curve of wax versus temperature using a heating curve for the base stock, correlating the heating curve of the base stock with a MRV for a formulated oil, and determining the MRV of the lubricant oil from the correlation of the base stock to the MRV of the corresponding desired base oil.
Claims2
A method to determine at least one low temperature property of a lubricant oil comprising
- a. obtaining a base stock;
- b. generating a Differential Scanning Calorimetry (DSC) curve using a Differential Scanning Calorimeter of wax melting versus temperature and wax crystallization versus temperature for the base stock;
- c. converting the DSC curve of wax melting versus temperature to a wax amount versus temperature curve using the heats of fusion of the waxes contained in the base stock;
- d, calculating total wax level between two temperatures by integrating the wax amount versus temperature curve between the two temperatures;
- e. determining a Mini-Rotary Viscometer (MRV) value of a finished lubricant oil blended from the base stock using a predetermined empirical correlation of total wax level versus MRV;
- and
- f. using the determined MRV value to determine whether or not the corresponding fully formulated lubricant oil will pass MRV yield stress and apparent viscosity specifications.
4 more elements
Dependencies are inferred from the claim text.