论文标题
溶剂诱导的沥青质沉淀中原代亚微米颗粒和较大聚集体的尺寸分布
Size distribution of primary submicron particles and larger aggregates in solvent induced asphaltene precipitation
论文作者
论文摘要
沥青质沉淀是石油工业中的一种关键相分离现象，尤其是在石质泡沫处理中，从油砂矿石中提取沥青。这项工作揭示了半径为0.2至0.4 um的颗粒的形成，该颗粒被定义为主要的亚微米颗粒（PSMP），这是由于沥青质溶液与我们实验中检查的23种类型的降水剂之间的扩散混合而无处不在。沥青质颗粒的产率和数量不仅受降水剂的hildebrand溶解性参数的影响，而且还受沥青质溶液和沉淀剂的扩散系数的影响。具有Hildebrand溶解性参数的人口平衡模型（PBM）已用于模拟粒度分布。数值预测与实验数据之间已经达成了良好的一致性。它表明胶体理论可以描述PSMP和较大聚集体的尺寸分布。因此，这项研究提供了有关依赖沉淀沥青质颗粒对沉淀剂组成和添加抑制剂的产量和尺寸分布的机制的新见解。控制沥青质产量和尺寸分布可以应用于烃类分离或沥青质沉淀的过程。
Asphaltene precipitation is a crucial phase separation phenomenon in the oil industry, especially in paraffinic froth treatment to extract bitumen from oil sands ores. This work reveals the formation of particles at 0.2 to 0.4 um in radius, defined as a primary sub-micron particle (PSMP), which is ubiquitous from diffusive mixing between asphaltene solution and any of 23 types of precipitants examined in our experiments. The yield and quantity of asphaltene particles are affected not only by the Hildebrand solubility parameter of the precipitants but also by the diffusion coefficients of the asphaltene solution and the precipitant. The Population Balance Model (PBM) with the Hildebrand solubility parameter has been used to model particle size distribution. Good agreement has been achieved between numerical predictions and the experimental data. It indicates that the colloid theory can describe the size distribution of PSMP and larger aggregates. Therefore, this study provides new insight into the mechanism for the dependence of yield and size distribution of the precipitated asphaltene particles on the composition of precipitants and adding inhibitors. Controlling of asphaltene yield and size distribution may be applied to the process of hydrocarbon separation or asphaltene precipitation prevention.
