Modeling the kinetics of asphaltene flocculation in toluene–pentane systems for the case of sonicated crude oils
Modeling the kinetics of asphaltene flocculation in toluene–pentane systems for the case of sonicated crude oils
复制标题
在超声处理原油的情况下，模拟甲苯-戊烷系统中沥青质絮凝的动力学
DOI：
10.1016/j.scient.2012.12.018
复制
发表时间：
2013
期刊：
影响因子：
1.4
通讯作者：
M. Amani
中科院分区：
文献类型：
--
作者：
M. H. Rad;M. Tavakolian;I. Najafi;M. Ghazanfari;Vahid Taghikhani;M. Amani
这项工作涉及监测超声波对抑制的影响，以及甲苯-正烷烃体系中沥青质絮凝的可逆动力学模型，这在文献中很少报道。将原油样品暴露在超声波下，然后使用共焦显微镜研究了添加正烷烃引起的絮凝沥青质颗粒的胶体结构演变。观察证实，超声波辐射可以改变原油中沥青质絮凝的不可逆性。为了解释沥青质团聚集的动力学，使用了 Smoluchowski 模型，并预测了沥青质团随时间变化的尺寸分布。应用分形分析并确定了动力学模型的参数。动力学模型的回归参数值表明，对于声处理油，形成系数降低，而崩解系数没有显着变化。原因可能是超声处理可以防止鸡群聚集，而不是将它们分解成更小的鸡群。这可能是其对絮凝作用持续存在的原因。这项工作说明了 Smoluchowski 模型在整个可逆絮凝过程范围内预测超声波辐射影响下沥青质絮团动力学的成功应用。
This work is concerned with the monitoring of ultrasound effects on inhibition, as well as the reversible kinetics modeling of asphaltene flocculation in toluene-n-alkane systems, which has been rarely reported in the literature. A crude oil sample was exposed to ultrasound waves, and then the colloidal structural evolutions of flocculated asphaltene particles induced by addition of n-alkane were studied, using a confocal microscopy. Observations confirmed that radiation of ultrasound can change the irreversibility of asphaltene flocculation in crude oil. To interpret the kinetics of asphaltene flock aggregation, the Smoluchowski model was used, and the time dependent size distribution of asphaltene flocks was predicted. Fractal analysis was applied and the parameters of the kinetic model were determined. The values for the regressed parameters of the kinetic model show that for sonicated oil, the formation coefficient decreases, while the disintegration coefficient did not considerably change. The reason might be that sonication prevents flocks from aggregating rather than disintegrating them into smaller flocks. It might be the reason for its lingering effect on flocculation. This work illustrates the successful application of the Smoluchowski model for predicting the kinetics of asphaltene flocks under the influence of ultrasonic radiation for the entire range of reversible flocculation processes.