沥青质在模拟石油系统中聚集的起始点和动力学:用动态光散射和超微显微镜研究

IF 1.1 4区 工程技术 Q3 CHEMISTRY, ORGANIC
V. N. Kuryakov
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引用次数: 0

摘要

本文报道了加入庚烷作为沉淀剂的0.1 g/L沥青质溶液在甲苯中的稳定性阈值的测定。为此,采用了超显微以及动态和静态光散射方法。以前从未使用超微显微镜来确定石油系统的稳定性阈值。利用上述实验方法,确定了所测沥青质溶液的沥青质聚集起始点,并揭示了超过稳定性阈值后平均聚集粒径的时间依赖性趋势。研究结果表明,超显微技术可以快速确定这类模拟油气系统的起始点,并且比动态或静态光散射具有更高的灵敏度;具体来说,它可以检测到较低浓度的沥青质聚集体。在起始点上方的单个、大量的庚烷加成导致了扩散受限的聚集。相比之下,逐渐滴定超过稳定阈值导致一个较慢的过程,其中平均骨料尺寸随时间线性增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Onset Points and Kinetics of Asphaltene Aggregation in Model Petroleum Systems: Investigation Using Dynamic Light Scattering and Ultramicroscopy

Onset Points and Kinetics of Asphaltene Aggregation in Model Petroleum Systems: Investigation Using Dynamic Light Scattering and Ultramicroscopy

Onset Points and Kinetics of Asphaltene Aggregation in Model Petroleum Systems: Investigation Using Dynamic Light Scattering and Ultramicroscopy

This paper reports on the determination of a stability threshold for an 0.1 g/L asphaltene solution in toluene with the addition of heptane as a precipitant. For this purpose, ultramicroscopy as well as dynamic and static light scattering methods were employed. Ultramicroscopy has never previously been used to determine stability thresholds in petroleum systems. Using the abovementioned experimental methods, an asphaltene aggregation onset point was identified for the tested asphaltene solution, and a time-dependent trend in mean aggregate size was revealed once the stability threshold was exceeded. The study results show that ultramicroscopy enables rapid onset point determination in model petroleum systems of this type and provides higher sensitivity than dynamic or static light scattering; specifically, it can detect lower concentrations of asphaltene aggregates. A single, bulk addition of heptane above the onset point resulted in diffusion-limited aggregation. In contrast, gradual titration past the stability threshold led to a slower process in which the mean aggregate size increased linearly with time.

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来源期刊
Petroleum Chemistry
Petroleum Chemistry 工程技术-工程:化工
CiteScore
2.50
自引率
21.40%
发文量
102
审稿时长
6-12 weeks
期刊介绍: Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas. Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.
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