Estimating Methyl/Methylene Groups in Asphaltene and Other Fractions of Asphalt

摘要

Infrared is the most widely used analytical method for interpreting the structure of petroleum fractions. In this study, IR spectra of standard normal nonade-cane were used to get e for methyl and methylene groups. A linear relationship was obtained by plotting the peak intensities at 2,954, 2,926, 2,854, 1,466, and 1,376 cm~(-1) against different amounts of N-nonadecane. The R~2 obtained for most of the plots was in the range of 0.988-0.997. The Beer-Lambert's law was used for the first time to quantitatively estimate the weight percent of methylene and methyl groups present in the different fractions of asphalt.