Rapid hydrocarbon group-type semi-quantification in crude oils by comprehensive two-dimensional gas chromatography
Rapid hydrocarbon group-type semi-quantification in crude oils by comprehensive two-dimensional gas chromatography
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DOI：
10.1016/j.fuel.2018.02.009
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发表时间：
2018-05-15
期刊：
影响因子：
7.4
通讯作者：
Azevedo, Debora A.
中科院分区：
文献类型：
--
作者：
Coutinho, Dayane M.;Franca, Daniela;Azevedo, Debora A.
石油是世界上使用的主要能源。石油行业在试图定量和定性地了解原油的化学成分方面面临着挑战。具体和复杂技术的应用允许详细描述并提供从勘探到生产、运输和原油精炼的重要信息。采用全二维气相色谱-飞行时间质谱仪(GCxGC-TOFMS)对12个不同API比重的原油样品进行了分析，旨在利用提取离子色谱图(EIC)和总离子色谱图(TIC)对烃类进行检测、鉴定和半定量。使用极性/非极性色谱柱可以更好地分离碳氢化合物类别，从而能够对碳氢化合物类别进行鉴定和半定量。因此，对正构烷烃、异构烷烃、烷基环己烷、烷基环戊烷、烷基十烷烃、烷基萘、烷基菲和烷基-9H-荧烯等系列化合物进行了表征。在本研究中，提出了一种使用TIC进行数据评估的半量化方法。综合评价在一次分析中提供了每个样品的色谱指纹，然后对碳氢化合物类别进行了半定量。油样提供了完全不同的碳氢化合物类别数据，即使在提供相似的API重力值时也是如此。半定量化合物主要为支链烷烃和正构烷烃，且大多数样品中支链烷烃的浓度高于正构烷烃。这些结果为石化行业提供了有价值的信息。GCxGC-TOFMS用于形态和基团类型的半定量，只需一滴油滴，无需分馏或净化步骤。
Petroleum is the main source of energy used in the world. The oil industry faces challenges in trying to understand the chemical composition of crude oils, quantitatively and qualitatively. The application of specific and sophisticated techniques allows a detailed characterization and provides important information that impacts from the exploration to production, transportation, and crude oil refining. A set of twelve crude oil samples with different API gravity were analyzed via comprehensive two-dimensional (2D) gas chromatography coupled to time-of-flight mass spectrometry (GCxGC-TOFMS) aimed at the detection, identification and semi-quantification of hydrocarbon classes using extracted ion chromatogram (EIC) and total ion chromatogram (TIC). The use of the polar/non-polar column configuration provided better separation between the hydrocarbon classes which allowed the identification and semi-quantification of the same. Therefore, series of n- and iso-alkanes, alkyl-cyclohexanes, alkyl-cyclopentanes, alkyl-decalines, alkyl-naphthalenes, alkyl-phenanthrenes and alkyl-9H-fluorenes were characterized. In the present study, a semi-quantification approach to data assessment using TIC is proposed. Comprehensive evaluation provided the chromatographic fingerprint of each sample in a single analysis followed by the semi-quantification of the hydrocarbon classes. The oil samples presented completely different hydrocarbon class data, even when presenting similar API gravity values. Branched alkanes and n-alkanes were the major semi-quantified compounds, and branched alkane concentrations were higher than n-alkanes in the majority of samples. These results afford valuable information for the petrochemical industry. GCxGC-TOFMS was applied for speciation and group-type semi-quantification using a single oil drop without a fractionation or clean up step.