核磁共振谱法估计重油和沥青中芳环分布

在假设不同环数芳环上取代度或取代基数相等的基础上，由Ｈ－ＮＭＲ数据，推导出芳环分布计算式。采用模型混合物验证不同环数芳环质子类型谱带归属然后估计出四种Ａｌｂｅｒｔａ沥青质芳环分布。结果表明，不同取代基数的假设，不会引起芳环分布估计的较大误差；Ａｌｂｅｒｔａ沥青质稠环环芳烃含量不高，与传统对沥青质中稠环芳烃含量估计相关甚大。

Estimation of Aromatic Ring Distribution for Heavy Oils and Bitumens by NMR

Based on the assumption of equal degree of substitution or equal number ofsubstituents on aromatic ring,the aromatic ring distribution of heavy oils and bitumens is es-timated by NMR proton spectra on the aromatics with the different ring number.Band as-signments of aromatic protons are checked with model mixtures. In this way the aromaticring distributions of four Alberta asphaltenes are estimated. The results show that the effectof the assumption above-mentioned on the error of the ring distribution estimate is insignifi-cant,and the content of aromatic condensed rings of Alberta asphaltenes is not high,whichis different from the traditional estimates.