Changes in asphaltene surface topography with thermal treatment

被引:28
作者
AlHumaidan, Faisal S. [1 ]
Rana, Mohan S. [1 ]
Tanoli, Nusrat J. [1 ]
Lababidi, Haitham M. S. [2 ]
Al-Najdi, Noura A. [1 ]
机构
[1] Kuwait Inst Sci Res, Petr Res Ctr, POB 24885, Safat 13109, Kuwait
[2] Kuwait Univ, Coll Engn & Petr, Chem Engn Dept, POB 5969, Safat 13060, Kuwait
关键词
Asphaltene; SEM; TEM; EDS; Topography; Thermal cracking; VACUUM RESIDUE; PETROLEUM ASPHALTENES; CRACKING BEHAVIOR; CRUDE OILS; HEAVY OILS; KINETICS; NMR; HYDROCONVERSION; DEACTIVATION; TECHNOLOGIES;
D O I
10.1016/j.arabjc.2020.03.016
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The impact of thermal cracking reaction on asphaltene structure and morphology has been investigated by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The structural and morphological changes at a microscopic level were monitored by comparing the parent asphaltenes from different vacuum residues (VRs) to their corresponding thermally treated asphaltenes, obtained from the by-product pitch after thermal treatment. The SEM analysis indicated that the asphaltene aggregates extracted from atmospheric residues have smooth and rough surfaces with agglomerate particles and bright inclusions. The SEM images of asphaltene aggregates that are extracted from the pitch samples after mild cracking demonstrated cleavage fracture morphology with obvious reduction in inclusions sizes and intensities. The TEM analysis, on the other hand, indicated that the asphaltenes from residual oils have tangled structures, with edges similar to a cauliflower. The tangled structure is mainly credited to the alkyl side-chains that impede the aromatic sheets from stacking. At mild cracking (400 degrees C), the asphaltene began to exhibit well-ordered layer structures near the edges due to the rupture of the alkyl side-chains. However, the tangled structure has been preserved in the interior of the sample. As the reaction severity increases (415 degrees C), the stacking of aromatic sheets became more evident even in the sample interior. At the most severe cracking condition (430 degrees C), an obvious reduction in the cluster diameter has been observed, which mainly resulted from the reduction in the number of aromatic sheets per stack. (C) 2020 The Author(s). Published by Elsevier B.V. on behalf of King Saud University.
引用
收藏
页码:5377 / 5389
页数:13
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