A Thermodynamic Model for Structure H Hydrates

9309595斯隆项目涉及在形成水合物的冰点附近，在中高压和高温下对含有水和碳氢化合物的体系进行相平衡研究。特别是，这个项目研究的是SH水合物。利用van der Waals和Platteeuw(1959)模型，提出了SH相平衡的统计热力学模型。在一个与模型开发平行的反馈模型中，该项目通过测量大分子的SH相平衡来研究这样的模型，这些大分子类似于碳氢化合物行业感兴趣的大分子(在上面的B和C项中)，但使用第二个较小的分子Xe，并且在冰点上方和下方使用CH4。研究人员计划使用该模型生成多相流体-水合物平衡的完整模型相图，类似于我们之前在其他水合物结构上所做的相图工作。该模型将根据相图的不寻常条件进行测试，例如，通过测量的SH+Si+气体+H2O+液体水合物相平衡的共存点进行测试，从而消除了多年实验研究的需要，类似于自1934年在管道中发现Si和SiI水合物以来所做的实验研究。***

9309595 Sloan This projects concerns phase equilibrium studies for systems containing water and hydrocarbons at intermediate and high pressures and temperatures in the vicinity of the ice point where hydrates are formed. In particular, this project investigates sH hydrates. A statistical thermodynamic model for sH phase equilibria using van der Waals' and Platteeuw's (1959) model is proposed. In a parallel, feedback model with model development , the project investigates such a model via sH phase equilibria measurements of large molecules like those of interest to the hydrocarbon industry (in Items B and C above) but with a second smaller molecule, Xe, and with CH4 both above and below the ice point. The investigators plan to use the model to generate an entire model phase diagram for multiphase fluid-hydrate equilibrium, via analogs to our previous phase diagram work on other hydrate structures. The model will be tested against unusual conditions of the phase diagram, for example with measured co-existence points of sH+sI+gas+H2O+liquid hydrate phase equilibria, obviating the need for many years of experimental research, analogous to that done on sI and sII hydrates since their 1934 discovery in pipelines. ***