A plausible reaction pathway of asphaltene under ultrasound
A plausible reaction pathway of asphaltene under ultrasound
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DOI：
10.1016/s0378-3820(01)00194-1
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发表时间：
2001-10-05
影响因子：
7.5
通讯作者：
Yen, TF
中科院分区：
文献类型：
--
作者：
Dunn, K;Yen, TF
在较早的报告[Energy Fuels，7（1993）111]中，提出了在室温和环境压力下通过化学辅助超声方法进行重油精炼过程的潜在益处。具体地，在空化和添加的表面活性剂的作用下，在15分钟内从原始沥青，35%的沥青质转化为瓦斯油和树脂馏分。目前的调查是一个持续的努力，以提供更多的信息，这种转换过程中，特别是研究水在超声转换过程中的作用。要回答的问题是：“在多大程度上，用于转化过程的氢的参与是水介质的结果？“为了追踪氢在水介质中的命运，选择氧化氘与水介质进行比较，选择硼氘化钠与硼氢化钠作为还原剂的来源进行比较。采用核磁共振（NMR）作为工具，实验结果初步得出，在超声波作用下，脱氢和裂解反应都发生了。还观察到，在不存在氢源的水介质的情况下，主要反应是脱氢，伴有轻微的裂化。只有在引入氢源后，裂化才显著增加。在反应路径图中沥青质环烷烃氢型的扩展处，同时发生裂解和脱氢反应。(C)2001爱思唯尔科技有限公司。保留所有权利。
In an earlier report [Energy Fuels, 7 (1993) 111], the potential benefits of a refining process for heavy oil through the chemical assisted ultrasound method at room temperature and ambient pressure were presented. Specifically, with the effects of cavitation and added surfactant, within 15 min from the original bitumen, 35% of asphaltene was converted into gas oil and resin fractions. The present investigation is a continuous effort to provide more information about this conversion process, particularly studying the role of water during the ultrasound conversion process. The question to be answered is: "To what degree is the participation of hydrogen, which was used for the conversion process, a result from the water medium?" In order to trace the fate of hydrogen in a water medium, deuterium oxide was chosen to compare with the water medium, and sodium borodeuteride was chosen to compare with sodium borohydride as a source of the reducing agent. Adopting nuclear magnetic resonance (NMR) as a tool, the results were tentatively concluded that both dehydrogenation and cracking reactions occurred under ultrasound. It was also observed, in the case of the water medium without the presence of hydrogen sources, that the principle reaction is dehydrogenation accompanied with minor cracking. The cracking increases considerably only after a hydrogen source is introduced. Simultaneous cracking and dehydrogenation are involved at the expanses of the naphthenic hydrogen type in asphaltene of the reaction pathway scheme. (C) 2001 Elsevier Science B.V. All rights reserved.