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Toward Separation and Characterization of Asphaltene Acid and Base Fractions
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-08-31 , DOI: 10.1021/acs.energyfuels.1c01999
Kheira Gharbi 1 , Chahrazed Benamara 1 , Khaled Benyounes 2 , Malcolm A. Kelland 3
Affiliation  

Chemical inhibition of asphaltene deposition is considered a cost-effective way to prevent the harsh consequences of asphaltene instability in the produced crude. Thus, a careful screening of asphaltene inhibitors is crucial for an efficient prevention. However, the characteristics of asphaltenes such as their acid–base properties will influence the selection of an asphaltene inhibitor and the inhibition mechanism. Therefore, improved knowledge on asphaltene acidic and basic fractions is important. In this work, the separation of asphaltenes into acid, base, neutral, and amphoteric fractions was performed. Among the existing techniques to fractionate asphaltenes, the method of Ramljack was adopted and applied on a light oil extracted asphaltene. However, this oil was sampled from one of the wells in the Hassi Messaoud field in Algeria that experienced a recurring deposition of asphaltenes. The results of asphaltene fractionation reveal that the half composition of this heavy part of crude oil is active functions gathered acid and base components. However, the main contribution is reported to the neutral fraction. The characterization results of infrared and elementary analyses show that both active fractions are aromatic and polar. Moreover, the acid fraction contains in its structure carboxylic acids, phenols, sulfoxide groups, and aliphatic chains, while the structure of the base fraction contains amines, sulfoxide groups, and aliphatic chains.

中文翻译:

沥青质酸和碱馏分的分离和表征

沥青质沉积的化学抑制被认为是防止生产的原油中沥青质不稳定性造成的严重后果的一种经济有效的方法。因此,仔细筛选沥青质抑制剂对于有效预防至关重要。然而,沥青质的酸碱特性等特性会影响沥青质抑制剂的选择和抑制机制。因此,提高关于沥青质酸性和碱性馏分的知识很重要。在这项工作中,将沥青质分离成酸、碱、中性和两性馏分。在现有的沥青质分馏技术中,采用Ramljack法对轻油提取的沥青质进行了应用。然而,这种油是从阿尔及利亚 Hassi Messaoud 油田的一口井中取样的,该油田经历了反复的沥青质沉积。沥青质分馏结果表明,该重质原油的一半成分是酸性和碱性成分聚集的活性功能。然而,主要贡献报告给中性部分。红外和元素分析表征结果表明,两种活性馏分均具有芳香性和极性。此外,酸馏分在其结构中包含羧酸、酚、亚砜基团和脂肪链,而碱馏分的结构包含胺、亚砜基团和脂肪链。沥青质分馏结果表明,该重质原油的一半成分是活性功能集聚酸碱成分。然而,主要贡献报告给中性部分。红外和元素分析表征结果表明,两种活性馏分均具有芳香性和极性。此外,酸馏分在其结构中包含羧酸、酚、亚砜基团和脂肪链,而碱馏分的结构包含胺、亚砜基团和脂肪链。沥青质分馏结果表明,该重质原油的一半成分是酸性和碱性成分聚集的活性功能。然而,主要贡献报告给中性部分。红外和元素分析表征结果表明,两种活性馏分均具有芳香性和极性。此外,酸馏分在其结构中包含羧酸、酚、亚砜基团和脂肪链,而碱馏分的结构包含胺、亚砜基团和脂肪链。
更新日期:2021-09-16
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