Mechanisms of Asphaltene Aggregation in Toluene and Heptane Mixtures
Mechanisms of Asphaltene Aggregation in Toluene and Heptane Mixtures
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甲苯和庚烷混合物中沥青质聚集的机理
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
R. Abedini
中科院分区：
文献类型：
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作者：
S. Ashoori;A. Abedini;Hadi Saboorian;Kh.Qorbani Nasheghi;R. Abedini
利用具有适当放大倍数的偏光显微镜研究了甲苯和庚烷混合物中胶体沥青质颗粒的聚集动力学性质。甲苯-庚烷混合物中沥青质的浓度从1克/升到8克/升不等。有两种与聚合过程相关的主要机制。这些机制是扩散限制聚集（DLA）和反应限制聚集（RLA）。每种机制都有其自身的特点，并且作用于沥青质浓度的有限值。当沥青质浓度低于临界胶束浓度（CMC）时，DLA机制占主导地位，而当浓度高于CMC时，在聚集过程的初始阶段，观察到RLA机制，然后该机制趋于DLA（交叉行为）。应当指出的是，溶液中沥青质的 CMC 约为 3 g/l。
The nature of aggregation kinetics of colloidal asphaltene particles in mixture of toluene and heptane was investigated by utilizing a polarizing microscope with appropriate magnification. The concentration of asphaltene in toluene-heptane mixture varied from 1 g/l to 8 g/l. There are two main mechanisms associated with the aggregation process. These mechanisms are diffusion limited aggregation (DLA) and reaction limited aggregation (RLA). Each mechanism has its own characteristics and acts on limited values of asphaltene concentration. At the asphaltene concentrations below the critical micelle concentration (CMC), the DLA mechanism is dominant, while at concentrations above the CMC, at the initial stage of aggregation process, the RLA mechanism is observed and then the mechanism tends toward DLA (crossover behavior). It should be noted that the CMC for asphaltene in the solution is around 3 g/l.