Abstract

In the present study, a scientific challenge of determination of various structural parameters of asphaltenes of medium heavy, heavy, and light crude oils is overcome by different spectroscopy techniques. Fourier Transform Infrared spectroscopy methods revealed indexing information besides clarification of different functional groups of asphaltenes. Analysis of Raman spectra of asphaltenes exhibited a higher average molecular size and more complicated chemical structures for the light crude oil asphaltenes compared to the ones from the heavy and medium heavy oils. Clarification of such chemical structures reveals why asphaltene molecules form aggregates leading to precipitation in particular when the percentage of asphaltenes is closer to and less than 1 wt % as in the case of light crude oils.

中文翻译：

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原油沥青质的分子光谱分析

摘要

在本研究中，通过不同的光谱技术克服了确定中等重，重和轻原油的沥青质各种结构参数的科学挑战。傅立叶变换红外光谱法除了阐明了沥青质的不同官能团外，还揭示了索引信息。沥青质的拉曼光谱分析显示，与重质和中质重油相比，轻质原油沥青质的平均分子尺寸更高，化学结构更复杂。对这种化学结构的澄清揭示了为什么沥青质分子形成聚集体而导致沉淀的原因，特别是当沥青质的百分比接近和小于1 wt％时（如在轻质原油的情况下）。