Thermodynamic Modeling of Dissociation Temperatures of Methane Hydrate in the Presence of PVCap

فاقد چكيده فارسي

In this work, methane hydrate dissociation conditions in the presence of PVCap are studied. A new hydrate model for structure I, SI, is proposed. Researchers found out that in the system containing PVCap as a kinetic inhibitor, large to small cavity ratio in hydrate lattice, L/S, are different from its theoretical value, i.e. 3/1. The new model has been developed on this concept when PVCap is present. It has been assumed that the number of small cavities to water molecules for methane hydrate in the presence of PVCap depend on PVCap concentration. Using the available experimental data of methane hydrate dissociation points, the parameters of the model have been optimized based on the minimization of error between the experimental and calculated hydrate dissociation points. In this way, PVCap acts as thermodynamic promoter. Comparison with experimental data reported in the literature indicates that the new model is fitted properly with the AAD of 0.10 K.