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Comparing the Coalescence Rate of Water-in-Oil Emulsions Stabilized with Asphaltenes and Asphaltene-like Molecules.
Langmuir ( IF 3.7 ) Pub Date : 2020-06-27 , DOI: 10.1021/acs.langmuir.0c00966 Zhuqing Zhang 1 , Jin Song 1 , Yu-Jiun Lin 1 , Xinglin Wang 1 , Sibani Lisa Biswal 1
Langmuir ( IF 3.7 ) Pub Date : 2020-06-27 , DOI: 10.1021/acs.langmuir.0c00966 Zhuqing Zhang 1 , Jin Song 1 , Yu-Jiun Lin 1 , Xinglin Wang 1 , Sibani Lisa Biswal 1
Affiliation
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Asphaltenes are a significant contributor to flow assurance problems related to crude oil production. Because of their polydispersity, model molecules such as coronene and violanthrone-79 (VO-79) have been used as mimics to represent the physiochemical properties of asphaltenes. This work aims to evaluate the emulsion-stabilization characteristics of fractionated asphaltenes and these two model molecules. Such evaluation is expected to better characterize the stabilizing mechanisms of asphaltenes on water-in-oil emulsions. The coalescence process of water-in-oil emulsion droplets is visualized using a microfluidic flow-focusing geometry. The rate of coalescence events is used as the parameter to assess emulsion stability. Interfacial tension (IFT) and oil/brine zeta potential are measured to help explain the differences in the rates of coalescence. VO-79 is found to be better at stabilizing emulsions as compared to coronene. Although VO-79 and asphaltenes have similar interfacial tension and oil/brine zeta potential values, the rate of coalescence differs significantly. This highlights the difficulty in using model molecules to mimic the transport dynamics of asphaltenes.
中文翻译：
比较用沥青质和类沥青质分子稳定的油包水乳液的聚结率。
沥青质是与原油生产有关的流量保证问题的重要因素。由于它们的多分散性，模型分子（例如co烯和violanthrone-79（VO-79））已被用作模拟物来代表沥青质的理化特性。这项工作旨在评估分馏的沥青质和这两个模型分子的乳液稳定特性。预期这种评估将更好地表征油包水乳液中沥青烯的稳定机理。油包水型乳剂小滴的聚结过程使用微流体流动聚焦几何图形进行可视化。聚结事件的速率用作评估乳液稳定性的参数。测量界面张力（IFT）和油/盐水Zeta电位有助于解释聚结速率的差异。已发现VO-79与二甲苯相比在稳定乳液方面更好。尽管VO-79和沥青质具有相似的界面张力和油/盐水Zeta电位值，但聚结速率却有很大差异。这突显了使用模型分子模拟沥青质传输动力学的困难。
更新日期：2020-07-14
中文翻译：
比较用沥青质和类沥青质分子稳定的油包水乳液的聚结率。
沥青质是与原油生产有关的流量保证问题的重要因素。由于它们的多分散性，模型分子（例如co烯和violanthrone-79（VO-79））已被用作模拟物来代表沥青质的理化特性。这项工作旨在评估分馏的沥青质和这两个模型分子的乳液稳定特性。预期这种评估将更好地表征油包水乳液中沥青烯的稳定机理。油包水型乳剂小滴的聚结过程使用微流体流动聚焦几何图形进行可视化。聚结事件的速率用作评估乳液稳定性的参数。测量界面张力（IFT）和油/盐水Zeta电位有助于解释聚结速率的差异。已发现VO-79与二甲苯相比在稳定乳液方面更好。尽管VO-79和沥青质具有相似的界面张力和油/盐水Zeta电位值，但聚结速率却有很大差异。这突显了使用模型分子模拟沥青质传输动力学的困难。
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