51.タールサンドビチューメンの熱分解特性

概要

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Thermal decomposition characteristics of distillates in bitumen are discussed on the basis of conversion and chemical structure changes. A bitumen sample was separated into four distillatites and vacuum by distillation. Each distillate and vacuum residue were heat-treated at 693K under nitrogen of 10MPa. Conversion of the heavy component (450℃+) into the light one (450℃-) was calculated with the chemical structure changes based on thermogravimetric analysis, elemental analysis and ^1H-, ^<13>C-NMR. Aromatic ring size of unit structure in distillates and residue is small and structural differences among them are in the paraffinic structures which consist of alkyl side chains and paraffinic bridges connecting the unit structures. For heavy fraction, cleavage of paraffinic bridge occurs in the initial stage of reaction, resulting in the decrease in average molecular weight. On the other hand, in the later stage of reaction, the release of low molecular weight hydrocarbons from alkyl side chains mainly occurs and, therefore remarkable change of average molecular weight is not observed.
一般社団法人日本エネルギー学会の論文
1997-10-30