Water solubility data in CO₂ are important for flow assurance and mitigation of corrosion issues during transportation in carbon capture, sequestration/storage and acid gas reinjection processes. Hydrate formation conditions, as well as solubility of CO₂ in water, have been well studied in the literature; however, there are relatively few studies for CO₂ liquid in equilibrium with a hydrate as a two-phase system. Moreover, there is a disparity between the various data regarding the pressure dependence of the water content of the CO₂ in this system. In this work, we report the water content in CO₂liquid at p = 7.893–50.91 MPa and T = 237.86–278.21 K, where the CO₂ phase is in equilibrium with only the pure type I hydrate. Our results support a very weak dependence on pressure, which can be expected with an equilibrium involving two relatively incompressible materials. In addition, new measurements are reported for the Lw-H-CO₂(g) and Lw-H-CO₂(l) phase boundaries for p = 1.262–15.596 MPa and T = 273.42–284.32 K using a 25 cm³ stirred autoclave cell. A full equilibrium model is described where the fluid phase was modeled using reference Helmholtz Equations of State for CO₂ and water, and the Sloan et al. (1987) model is used for the hydrate phase.

CO ₂中的水溶性数据对于确保碳捕集，封存/存储和酸性气体再注入过程中的运输过程中的流量保证和缓解腐蚀问题非常重要。在文献中已经对水合物的形成条件以及CO ₂在水中的溶解度进行了充分的研究。然而，关于CO ₂液体与水合物作为两相体系平衡的研究相对较少。此外，在该系统中，关于CO ₂的水含量的压力依赖性的各种数据之间存在差异。在这项工作中，我们报告了p = 7.893–50.91 MPa和T时CO ₂液体中的水分= 237.86–278.21 K，其中CO ₂相仅与纯I型水合物处于平衡状态。我们的结果支持非常弱的压力依赖性，这可以通过涉及两种相对不可压缩的材料的平衡来预期。此外，据报道，在25 cm ³搅拌下，p = 1.262–15.596 MPa和T = 273.42–284.32 K时，Lw-H-CO ₂（g）和Lw-H-CO ₂（l）相界的新测量值高压灭菌池。描述了一个完全平衡模型，其中使用参考Helmholtz CO ₂状态参考方程对流体相进行建模和水，还有斯隆（Sloan）等人。（1987）模型用于水合物相。