Modeling Hydrate Dissociation Curves in the Presence of Hydrate Inhibitors with a Modified CPA EoS
2019
Palma, André M. | Queimada, António J. | Coutinho, João A. P.
A modified CPA equation of state has been applied for the description of noninhibited hydrates. In this work, this model is applied to the description of dissociation curves of hydrates inhibited by six thermodynamic inhibitors (methanol, ethanol, MEG, DEG, TEG, and glycerol), while also focusing on promoting a correct simultaneous description of SLE and VLE between the inhibitors and water. The study concern some of the most well-known hydrate formers (methane, ethane, propane, CO₂, Xe, and H₂S) and mixtures of these gases. The maximum number of binary interaction parameters applied between water and the hydrate inhibitor is two, one for the physical term and one for association. A comparison between this approach and the hydrates model present on Multiflash is reported, revealing that the present approach, while less accurate than Multiflash is still able to correctly describe hydrate inhibition, VLE and LLE, while using a smaller number of parameters.
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