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关于CH4-CO2二元酸盐水合物的相位行为:与水相平衡

Hideki Tanaka^1,2, Masakazu Matsumoto², Takuma Yagasaki³

¹Toyota Physical and Chemical Research Institute, Nagakute 480-1192, Japan.

The Journal of chemical physics

|December 4, 2024

概括

这项研究使用统计力学量化了甲 (CH4) 和二氧化碳 (CO2) 在水合物中的可溶性. 研究结果揭示了客体成分和有限溶解度如何影响水合物相态度和解离温度.

科学领域:

热力学和物理化学热力学和物理化学
材料科学材料科学材料科学
地质化学地质化学

背景情况:

气体水合物,结晶固体捕获客分子,在储能和气候科学中至关重要.
了解与水合物共存的水相中的客溶性,对于预测它们的稳定性和行为至关重要.
酸盐的非固体测量性质显著影响了它们的相位平衡和核化过程.

研究的目的:

探索和量化甲 (CH4) 和/或二氧化碳 (CO2) 在水相与各自的水合物平衡中的可溶性.
研究有限客体溶解度对水合物阶段行为的影响,特别是CO2水合物的解离温度.
应用统计力学方法来模拟单元和二元CH4-CO2水合物的平衡条件.

主要方法:

利用基于双向分子间潜力的统计力学理论来计算水和水合物中的客体物种的化学潜力.
纳入了水合物的非固态测量性质进入相位行为和核化驱动力评估.
在评估CO2水合物的两相平衡时,考虑了有限的CO2在水中的可溶性.

主要成果:

该计算方法显示了较低的计算成本,同时覆盖了广泛的温度,压力和客体组成范围,包括二进制水合物.
发现有限的二氧化碳溶解度会导致二氧化碳水合物解离温度的小而系统的偏差.
观察到二氧化碳溶解度在含有水合物和不含水合物的情况下存在明显的温度依赖性,以及二进制水合物所涉及的各个阶段的客体成分的显著差异.

结论:

开发的统计力学方法准确地估计了水份平衡条件,考虑到非静态测量和有限的客体溶解度.
有限溶解度在水合物解离热力学中起着可测量的作用,特别是在CO2水合物中.
该研究提供了关于CH4-CO2二元酸盐复杂相位平衡的见解,突出了组成变化.

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