Investigating the Influence of n-Heptane versus n-Nonane upon the Extraction of Asphaltenes.
Investigating the Influence of n-Heptane versus n-Nonane upon the Extraction of Asphaltenes.
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DOI：
10.1021/acs.energyfuels.2c01168
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发表时间：
2022-08-18
期刊：
影响因子：
5.3
通讯作者：
Barrow, Mark P.
中科院分区：
文献类型：
--
作者：
Alostad, Latifa K.;Lozano, Diana Catalina Palacio;Gannon, Benedict;Downham, Rory P.;Jones, Hugh E.;Barrow, Mark P.
沥青质的组成之所以引起人们的关注，是因为它们给工业带来了挑战，而且其高度复杂性，包括一系列杂原子含量、分子量、双键当量 (DBE) 和结构基序。众所周知，它们聚集超过临界浓度，阻碍上游和下游过程。沥青质是通过溶解度来定义的，因为它们不溶于轻质链烷烃（例如正庚烷），但可溶于芳香族溶剂（例如甲苯）。如今，人们正在投入巨大的努力来表征沥青质，以揭示其结构特征，从而有利于石油工业和环境可持续性。傅里叶变换离子回旋共振质谱 (FT-ICR MS) 提供具有无与伦比的质量分辨率和质量精度的分子水平分析，这对于表征固有复杂的原油及其沥青质馏分至关重要。本研究的目的是阐明和比较两种石油样品的沥青质馏分的组成特征，通过两种方法进行分馏：使用正庚烷（典型做法）和正壬烷（用于测试使用较高分子量烷烃的萃取）。结果强调，溶剂的选择确实会影响不同物种的可及性，因此改变了所观察到的提取沥青质的分子分布。正庚烷提供了不同杂原子类别的更广泛贡献和观察到的组分的更大碳数范围； DBE 分布与碳数分布不同，其中使用正壬烷生产的提取物显示较低 DBE 物种的存在率较高。
The composition of asphaltenes is of interest due to the challenges they pose for industry and their high complexity, encompassing a range of heteroatom contents, molecular weights, double bond equivalents (DBEs), and structural motifs. They are well-known for aggregating above critical concentrations, hindering the upstream and downstream processes. Asphaltenes are defined by solubility, as they are insoluble in light paraffins such as n-heptane and soluble in aromatic solvents such as toluene. Today, enormous efforts are being invested into the characterization of asphaltenes to shed light into their structural profiles to benefit the petroleum industry and environmental sustainability. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) provides molecular level analysis with unparalleled mass resolving power and mass accuracy, which is vital for the characterization of inherently complex crude oils and their asphaltene fractions. The aim of this research is to elucidate and compare the compositional profiles of asphaltene fractions of two petroleum samples, fractioned through two approaches: using n-heptane, as is typical practice, and n-nonane, for the purpose of testing extraction using higher molecular weight alkanes. The results highlight that the choice of solvents does indeed influence the accessibility of different species and therefore changes the observed molecular profiles of the extracted asphaltenes. n-Heptane afforded broader contributions of different heteroatomic classes and greater carbon number ranges of the observed components; the DBE distribution vs carbon number profiles were different, where the extracts produced using n-nonane displayed a greater prevalence of lower DBE species.
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DOI：
10.1109/tvcg.2014.2346248
发表时间：
2014-12
影响因子：
5.2
作者：
Lex A;Gehlenborg N;Strobelt H;Vuillemot R;Pfister H
通讯作者：
Pfister H
影响因子：
5.3
作者：
Alvarez-Ramirez, Fernando;Ruiz-Morales, Yosadara
通讯作者：
Ruiz-Morales, Yosadara
影响因子：
5.3
作者：
Chacon-Patino, Martha L.;Rowland, Steven M.;Rodgers, Ryan P.
通讯作者：
Rodgers, Ryan P.
影响因子：
7.4
作者：
DICKIE, JP;YEN, TF
通讯作者：
YEN, TF
影响因子：
5.3
作者：
Park, Jun Woo;Cho, Yunju;Lee, Ki Bong
通讯作者：
Lee, Ki Bong