Abstract
A detailed chemical composition analysis of group II type lubricant oil has been accomplished by high-resolution gas chromatography (HRGC) and comprehensive two-dimensional gas chromatography (GCxGC). The major advantage of these techniques is the ability to obtain the detailed fingerprint of major paraffin components. To achieve the superior low-temperature property in lubricant oil via dewaxing processes, it is critical to monitor the change of key components (paraffins) in order to understand the effect of paraffins on the low-temperature property of base oil and the mechanism of each dewaxing process as well as the effectiveness of each process. Comprehensive two-dimensional gas chromatography (GCxGC) provides a better separation between the paraffins and naphthenes in the lubricant oil. Based on the quantitative analysis of GCxGC results, a formula has been developed to correlate the paraffin chemical composition to one of the low-temperature property, viscosity measured by a mini-rotary viscometer (...
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