Abstract
1H and 13C NMR spectroscopy of vacuum distillates (lubricating oil fractions) and the solvent treated oils of them were carried out to investigate their average molecular structures. The aromaticity derived from 1H NMR using Brown-Ladner's equation (faH) was estimated to be lower than that derived directly from 13C NMR (faC). It was pointed out that the assumption that Brown-Ladner's parameters (x and y) 2.0 was not suitable in this case; and instead a value, 2.06-2.22 was obtained. In the aliphatic region of the 13C NMR spectra, several characteristic peaks assignable to-(CH2)n- n_??_6(29.7ppm)and CH3-(CH2)n-n_??_3(14.1ppm) and others can be observed. Using the relative intensities of these peaks and average structural parameters, average structural models of the solvent treated oils were proposed. The models well demonstrate the characteristics of the lubricating oil refining process.
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