Prediction of carbon dioxide hydrate formation conditions in the presence of cyclopentane using the CPA equation of state

The main problem of using gas hydrates is their low rate of production. To alleviate thisproblem, addition of promoters is suggested by many researchers. Promoters can also increasethe volume of gas trapped in the hydrate lattice, improve the speed of its formation, and changethe equilibrium condition for hydrate formation, In fact hydrates can be formed at highertemperatures and lower pressures. In this study, the hydrate formation conditions for gas mixturesystem of carbon dioxide in the presence of cyclopentane are predicted. A thermodynamic modelbased on the Cubic-Plus-Association (CPA) equation of state is applied to perform the vapor–liquid–liquid (V–LHC–LW) three-phase flash calculation and the van der Waals-Platteeuw solidsolution theory is used to characterize hydrate phase. The results based on the CPA equation ofstate is better than the Peng-Robinson due to its association term [1]. The Results show that thecalculated values are in good agreement with the experimental data [2, 3, 4, 5].

کلیدواژه ها:

Gas Hydrate ، Promoter ، CPA ، Cyclopentane ، Three-Phase Flash