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Macrostructural Parameters of Asphaltene Nanoaggregates in Natural Asphaltite and in Its Supercritical Water Conversion Products
Petroleum Chemistry ( IF 1.4 ) Pub Date : 2021-07-07 , DOI: 10.1134/s0965544121070069
V. R. Antipenko 1 , O. N. Fedyaeva 2 , A. A. Vostrikov 2
Affiliation  

Abstract

The XRD-based study investigates the macrostructural parameters of asphaltenes isolated from natural sulfur-rich asphaltite and from liquid conversion products of this asphaltite. The conversion was carried out in a supercritical water flow at 400°C and 30 MPa both in the absence and in the presence of aluminum and zinc additives. The XRD data demonstrate a decrease in the stack thickness (Lc) and in the number of aromatic sheets (M) in asphaltenes isolated from the conversion products compared to the initial asphaltite. On the other hand, the aromaticity (far) and the average aromatic sheet diameter (La) increase by a factor of nearly three; a significant rise is also observed in the proportion of stacked carbon atoms (φa). In the presence of metal additives, the differences are more pronounced. This is because the oxidation of zinc and aluminum in supercritical water, accompanied by heat release, increases the local temperature of the reactants and generates active hydrogen that prevents radical fragments from recombination.



中文翻译:

天然沥青石及其超临界水转化产物中沥青质纳米聚集体的宏观结构参数

摘要

基于 XRD 的研究调查了从天然富硫沥青岩和这种沥青岩的液体转化产物中分离出来的沥青质的宏观结构参数。在不存在和存在铝和锌添加剂的情况下,在 400°C 和 30 MPa 的超临界水流中进行转化。XRD 数据表明,与初始沥青岩相比,从转化产物中分离出的沥青质中的堆积厚度 ( L c ) 和芳香层数 (M) 减少。另一方面,芳香度 ( f ar ) 和平均芳香片直径 ( L a) 增加近三倍;还观察到堆叠碳原子的比例(φ a)显着增加。在金属添加剂的存在下,差异更加明显。这是因为锌和铝在超临界水中氧化,伴随着放热,提高了反应物的局部温度并产生活性氢,防止自由基碎片复合。

更新日期:2021-07-07
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