Patent ID: 8452548
Filing Date: 2013-05-28
Classification: G01N

Abstract:
1. 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.