Understanding the fluid phase behaviour of crude oil: Asphaltene precipitation
Understanding the fluid phase behaviour of crude oil: Asphaltene precipitation
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DOI：
10.1016/j.fluid.2011.01.024
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发表时间：
2011-07-15
影响因子：
2.6
通讯作者：
Haslam, Andrew J.
中科院分区：
文献类型：
--
作者：
Artola, Pierre-Arnaud;Pereira, Frances E.;Haslam, Andrew J.
我们从热力学角度给出了原油沥青质析出的简化但一致的图像，通过计算包含气泡曲线和沥青质析出边界的恒定组成p-T相图，说明了它与熟悉的气泡曲线的关系。利用统计关联流体理论（SAFT），我们表明降水边界的位置可以用一个包含相对较少分量的非常简单的流体模型来解释。我们的结果支持这样的观点，即沥青质沉淀的前驱体是由于流体中的脱混不稳定性而导致的液-液相分离。此外，这些系统的气泡曲线可以看作是两相（液-液）和三相（气-液-液）平衡区域之间的边界。(C) 2011 Elsevier B.V.版权所有
We present a simplified but consistent picture of asphaltene precipitation from crude oil from a thermodynamic perspective, illustrating its relationship to the familiar bubble curve via the calculation of constant-composition p-T phase diagrams that incorporate both the bubble curve and the asphaltene precipitation boundary. Using the statistical associating fluid theory (SAFT) we show that the position of the precipitation boundary can be explained using a very simple fluid model including relatively few components. Our results support the view that the precursor to asphaltene precipitation is a liquid-liquid phase separation due to a demixing instability in the fluid. Moreover, the bubble curve for these systems is seen to represent a boundary between regions of two-phase (liquid-liquid) and three-phase (vapour-liquid-liquid) equilibria. (C) 2011 Elsevier B.V. All rights reserved.