No.1 アスファルテン分子サイズの拡散係数に基づく評価(構造,重質油,その他)

概要

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The molecular properties of asphaltenes have been the subject of uncertainty in the literature; especially the molecular architecture is still a matter of debate. Some literature reports provide evidence that the contrast of petroleum asphaltenes versus coal asphaltenes is useful for understanding the governing principles of asphaltene identity. Here, fluorescence correlation spectroscopy has been employed to measure the diffusion constants of asphaltenes and along with the heaviest resin fractions derived from the distillation resid from coal liquefaction fluids. These are compared with the same measurements on petroleum asphaltenes. In addition, ^<13>C NMR is performed on these samples to correlate molecular properties with diffusion constants. These results confirm that the molecular sizes of these coal-derived asphaltenes are much smaller than virgin petroleum asphaltenes. In addition, There is a molecular continuum from lighter to heavier fractions in these materials. The small size of coal asphaltenes is correlated with a small alkane carbon constraints for understanding asphaltene molecular architecture.
2010-09-21