沥青质和树脂的结构组织及重油低极性组分的组成,Energy & Fuels

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沥青质和树脂的结构组织及重油低极性组分的组成
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-06-22 , DOI: 10.1021/acs.energyfuels.3c01048
Elena Yu. Kovalenko ₁ , Tatiana A. Sagachenko ₁ , Kirill A. Cherednichenko ₂ , Natalya N. Gerasimova ₁ , Tatiana V. Cheshkova ₁ , Raisa S. Min ₁

Affiliation

给出了 Ashalchinskoye (I) 和 Nurlatskoye (II) 油田（俄罗斯鞑靼斯坦共和国）重油的树脂、沥青质和低极性组分的比较特征。这些石油的主岩年龄（分别为二叠纪和泥盆纪）及其成分和杂原子的含量不同。X射线相分析以及扫描和透射电子显微镜表明，与油I的光滑表面沥青质相比，油II的沥青质具有疏松、多孔的表面和较小尺寸的纳米聚集体的特征。由于烷基侧链构型，纳米聚集体形成无序的缠结结构，这使得芳香片层难以堆叠。油II的沥青质纳米团聚体的晶粒小于油I的沥青质纳米团聚体的晶粒。¹ H NMR 光谱使得可以确定，由于环烷芳族系统中芳族和环烷烃循环含量的增加，重油 I 的树脂和沥青质的平均分子的总体尺寸较大。油 II 的树脂-沥青质组分结构的一个特点是侧链中有更多的烷基取代基。根据气相色谱-质谱 (GC-MS) 分析，所研究的低极性组分具有一组相似的饱和烃（正构烷烃、单环烷烃和多环烷烃），但所鉴定的芳香烃和杂有机化合物。油 II 的低极性成分的一个特点是存在更广泛的n-烷基和苯烷基取代的苯以及其组成中的氮和氧有机化合物。

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Structural Organization of Asphaltenes and Resins and Composition of Low Polar Components of Heavy Oils

Comparative characteristics of resins, asphaltenes, and low polar components of heavy oils from the Ashalchinskoye (I) and Nurlatskoye (II) oil fields (Republic of Tatarstan, Russia) are given. These oils differ in the age of host rocks (Permian and Devonian, respectively) and the content of their components and heteroatoms. An X-ray phase analysis and scanning and transmission electron microscopy reveal that, in contrast to smooth surface asphaltenes of oil I, asphaltenes of oil II are characterized by a loose and porous surface and smaller sizes of nanoaggregates. Nanoaggregates form a disorderly tangled structure because of the alkyl side-chain configuration, which makes it difficult to stack aromatic sheets. The crystallites of nanoaggregates of asphaltenes of oil II are smaller than the crystallites of nanoaggregates of asphaltenes of oil I. The application of the method of structural-group analysis based on the use of the measured indicators of the elemental composition, average molecular weights, and the results of ¹H NMR spectroscopy made it possible to establish that overall sizes of mean molecules of resins and asphaltenes of heavy oil I are larger due to the increased content of aromatic and naphthenic cycles in the naphthenoaromatic system. A feature of the structure of the resin–asphaltene components of oil II is a greater number of alkyl substituents in the side chains. According to gas chromatography–mass spectrometry (GC–MS) analysis, the low polar components under study are characterized by a similar set of saturated hydrocarbons (n-alkanes, mono-, and polycycloalkanes) but differ in the composition of identified aromatic hydrocarbons and heteroorganic compounds. A feature of the low polar components of oil II is the presence of a wider range of n-alkyl- and phenylalkyl-substituted benzenes and nitrogen- and oxygen-organic compounds in their composition.

更新日期：2023-06-22

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