Catalytic pyrolysis of Arab Heavy residue and effects on the chemistry of asphaltene
Catalytic pyrolysis of Arab Heavy residue and effects on the chemistry of asphaltene
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DOI：
10.1016/j.jaap.2010.09.006
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发表时间：
2010-11
影响因子：
6
通讯作者：
M. Siddiqui
中科院分区：
文献类型：
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作者：
M. Siddiqui
为了了解沥青质结构在热解过程中的变化，在小型固定床反应器中使用FCC催化剂、ZSM-5沸石、加氢裂化催化剂（HC-1）和加氢处理催化剂（NiMo）对阿拉伯重质常压渣油进行水热反应。四种不同催化剂对渣油裂解反应的影响表明，渣油裂解反应受催化剂类型的影响。本研究中使用的所有四种催化剂都有利于实现加氢裂化选择性，并且被发现可以有效地将大沥青质分子转化为较小的部分。采用红外光谱、核磁共振和高压凝胶渗透色谱技术对沥青质进行了详细的分析。这些分析表明，渣油和沥青质的平均分子量分布在热解反应后降低，表明较大分子的断裂。核磁共振结果表明，除ZSM-5催化剂外，所有反应所得沥青质中芳烃碳和芳烃质子含量均有所增加。红外光谱分析表明，渣油热解后沥青质的化学性质发生了明显的变化。进行热解反应并保持以下反应条件：反应时间：1小时，温度400 ° C，进料量（阿拉伯重质渣油）：10 g，催化剂量：进料的5%（0.5 g）和氢气压力：900 - 1300 psi。这项工作产生的组成数据将提高沥青质结构的理解，这将是非常有价值的改进炼油实践，地球化学研究和评估沥青的性能。
In an attempt to understand the changes in asphaltene structure during pyrolysis, hydrothermal reactions were performed on Arab Heavy atmospheric residue using FCC catalyst, ZSM-5 zeolite, hydrocracking catalyst (HC-1) and hydroprocessing (NiMo) catalyst in a bench-scale fixed bed reactor. The effect of four different catalysts on pyrolysis reactions showed that the cracking of residue is affected by catalyst type. All four catalysts used in this study are good for achieving hydrocracking selectivity and were found to be effective in conversion of large asphaltene molecules into smaller moieties. Detailed analyses of asphaltenes were carried out using IR, NMR and HP-GPC techniques. These analyses indicated that the mean molecular weight distribution of residue and asphaltenes decreased after pyrolysis reactions indicating the breaking up of larger molecules. The NMR showed the increase of aromatics carbon and aromatic proton contents in asphaltene obtained from all reactions except when using ZSM-5 catalyst. IR analysis showed that there were significant changes in the chemistry of asphaltenes after the pyrolysis of residue. The pyrolysis reactions were performed and the following reaction conditions were maintained; reaction time: 1h, temperature 400°C, feed amount (Arab Heavy residue): 10g, catalyst amount: 5% of feed (0.5g) and hydrogen gas pressure: 900–1300psi. The compositional data generated by this work will enhance the understanding of asphaltene structure that will be of great value in improved refining practices, geochemical studies and in assessing performance properties of asphalt.