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首页> 外文期刊>RSC Advances >Interfacial tension and CO2 diffusion coefficients for a CO2 + water and n-decane system at pressures of 10 to 160 bar
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Interfacial tension and CO2 diffusion coefficients for a CO2 + water and n-decane system at pressures of 10 to 160 bar

机译：CO2 +水和N-癸烷系统的界面张力和CO2扩散系数在10至160巴的压力下

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摘要

The objective of this study is to address the influence of different CO2 phases and degrees of CO2 saturation on the interfacial tension and the diffusion of CO2 into a hydrocarbon drop. Axisymmetric drop shape analysis on a pendant drop was used to carry out experiments in a pressure range of 10 to 160 bar and temperatures of 25 degrees C, 35 degrees C, and 45 degrees C, thus covering the gaseous, liquid, and supercritical phases of CO2. A numerical model that estimates the diffusion coefficient of CO2 in the hydrocarbon was developed. The IFT between the carbonated water and the hydrocarbon increases with pressure in the gaseous phase of CO2 and decreases in the liquid and supercritical CO2 phases. Interestingly, when the pressure was increased above 120 bar, the IFT did not change (decrease); this indicates that above this pressure, complete miscibility may not be achieved for this system, as indicated by the stable IFT. From the results, it can be concluded that the maximum IFT, maximum density decrease, and minimum diffusion coefficient occurred at pressures near to and below the phase change pressure of CO2 (64 bar at 25 degrees C and 74 bar at 35 degrees C and 45 degrees C). Both CO2-water-hydrocarbon and CW-hydrocarbon systems show the same trends; however, there were significant differences in the CO2 mass transfer rate and the concentration gradient.
机译：该研究的目的是解决不同CO 2阶段的影响和CO2饱和度对界面张力的影响和CO2的扩散到烃滴。吊坠滴的轴对称下降形状分析用于在10至160巴的压力范围内进行实验，以及25摄氏度，35℃和45℃的温度，从而覆盖气态，液体和超临界阶段二氧化碳。开发了一种估计烃中CO2扩散系数的数值模型。碳酸水和烃之间的IFT在CO 2的气相中的压力下增加，并在液体和超临界CO 2相中减少。有趣的是，当压力增加120巴时，IFT没有变化（减少）;这表明在此压力方面，该系统可能无法实现完全的混溶性，如稳定的IFT所示。从结果中，可以得出结论，最大IFT，最大密度降低和最小扩散系数在CO 2的相变压靠近和低于CO 2的相变压（25摄氏度为35℃和45的74巴的压力下C）。二氧化碳 - 水 - 烃和CW - 碳氢化合物系统都表现出相同的趋势;然而，CO 2传质速率和浓度梯度存在显着差异。

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  • 来源
    《RSC Advances》 |2018年第67期|共12页
  • 作者

    Bagalkot Nikhil; Hamouda Aly A.;

  • 作者单位

    Univ Stavanger Dept Energy &

    Petr N-4036 Stavanger Norway;

    Univ Stavanger Dept Energy &

    Petr N-4036 Stavanger Norway;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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