在不同的pH条件下,机械研究油吸附行为和CO2排放机制
Xinwang Song1, Yang Guo1, Yanchang Chen1
1Shandong Key Laboratory of Green Electricity & Hydrogen Science and Technology, School of Chemical Engineering, Shandong Institute of Petroleum and Chemical Technology, Dongying 257061, China.
Molecules (Basel, Switzerland)
|July 30, 2025
概括
这项研究揭示了pH值如何影响二氧化碳增强石油回收过程中石英上的原油成分吸附. 较高的pH值通过阴离子-π相互作用增加了芳香碳化合物的吸附,影响了油位效率.
科学领域:
- 石油工程是石油工程中的一个.
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 使用二氧化碳泛滥的增强石油回收 (EOR) 对碳化合物生产和碳封存至关重要.
- 在CO2-EOR期间,石英占主导地位的水库中,pH对界面相互作用的影响尚不清楚.
- 了解pH影响对于优化CO2-EOR策略在特定地质构成中的重要.
研究的目的:
- 用分子动力学 (MD) 模拟来研究石英表面上原油成分的pH依赖吸附.
- 为了阐明pH驱动的吸附变化对石英丰富的水库中二氧化碳排放机制的影响.
- 为在不同pH条件下优化CO2-EOR提供分子层面的见解.
主要方法:
- 采用分子动力学 (MD) 模拟来模拟石英表面上的原油成分吸附.
- 利用了三个石英表面模型,代表了基于电离度的不同pH环境 (pH 2-4,5-7和7-9).
- 在不同的pH条件下分析了吸附行为,扩散系数和界面相互作用.
主要成果:
- 石英上的芳香碳化合物吸附率随着pH值显著增加 (398至778千克/立方米从pH值2-4至7-9),而的吸附率则下降 (764至460千克/立方米).
- 增强的阴离子-π相互作用,通过Na+聚合在高pH负电荷的石英表面,驱动芳香吸附.
- 二氧化碳的排放遵循吸附-剥离-排放机制;更高的pH值减弱了油表面相互作用,增加了扩散,但更紧的芳香包装减缓了排放.
结论:
- 在石英储中,pH极大地影响了原油成分吸附和二氧化碳排放机制.
- 表面电荷和-π相互作用在pH调节的CO2-EOR过程中起着关键作用.
- 分子洞察力可以指导在不同的pH条件下优化CO2-EOR策略,用于不同pH条件下的富含石英的形成.
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