Abstract
Special techniques were used to analyse lube oils: these include low-temperature and pressurized differential scanning calorimetric (DSC) analysis, and modified thermogravimetric analysis (TG) furnace for lube oil density determination. DSC analysis shows that lube oils contain crystallizable (waxy) and non-crystallizable components (non-waxy). The non-waxy part of the oil displays a glass transition ( i.e. −90 to −61°C), which is unaffected by the waxy phase, but is affected by lube oil boiling range. The wax present in lube oils displays a broad dissolution temperature range ( i.e. −68 to +44°C), which is dependent on wax composition, and is thus affected by the boiling range and crude oil source. DSC wax crystallization temperatures are shown to correlate with ASTM cloud and pour points. It is also shown that DSC analysis could be used to study oil oxidation. From the literature it is apparent that thermal analysis can be used to characterize petroleum based materials such as asphalts, lube oils, fuel oils, greases and waxes.
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