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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 +水和正癸烷系统在10至160 bar压力下的界面张力和CO2扩散系数

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The objective of this study is to address the influence of different CO _(2) phases and degrees of CO _(2) saturation on the interfacial tension and the diffusion of CO _(2) 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 °C, 35 °C, and 45 °C, thus covering the gaseous, liquid, and supercritical phases of CO _(2) . A numerical model that estimates the diffusion coefficient of CO _(2) in the hydrocarbon was developed. The IFT between the carbonated water and the hydrocarbon increases with pressure in the gaseous phase of CO _(2) and decreases in the liquid and supercritical CO _(2) 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 CO _(2) (64 bar at 25 °C and 74 bar at 35 °C and 45 °C). Both CO _(2) –water–hydrocarbon and CW–hydrocarbon systems show the same trends; however, there were significant differences in the CO _(2) mass transfer rate and the concentration gradient.
机译：这项研究的目的是要解决不同的CO _（2）相和CO _（2）饱和度对界面张力和CO _（2）扩散到烃滴中的影响。使用悬垂液滴的轴对称液滴形状分析在10至160 bar的压力范围和25°C，35°C和45°C的温度下进行实验，从而涵盖了气相，液相和超临界相。 CO _（2）。建立了估算CO _（2）在碳氢化合物中扩散系数的数值模型。碳酸水和碳氢化合物之间的IFT在CO_（2）的气相中随压力增加而在液相和超临界CO_（2）相中减小。有趣的是，当压力增加到120 bar以上时，IFT并没有发生变化（下降）。这表明，在此压力之上，如稳定的IFT所示，该系统可能无法实现完全的混溶性。从结果可以得出结论，在接近或低于CO _（2）相变压力（25°C下为64 bar，35°C下为74 bar）的压力下，出现了最大IFT，最大密度降低和最小扩散系数。 °C和45°C）。 CO _（2）–水–碳氢化合物和CW–碳氢化合物系统都显示出相同的趋势。但是，CO _（2）传质速率和浓度梯度存在显着差异。

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