S Moradiyan - Faculty of Petroleum ,Gas and Petrochemical Engineering, Persian Gulf University, Bushehr, Iran
A.A Izadpanah - Institut de Recherche en Génie Chimique et Pétrolier (IRGCP), Paris Cedex, France
A.H Mohammadi - Discipline of Chemical Engineering, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban ۴۰۴۱, South Africa

There is a thermodynamic model to determine structure H (sH) hydrate stability conditions i.e the Klauda-Sandler model, which was typically used for water-immiscible or slightly soluble sH hydrate formers in the presence of various help gas. However, some sH clathrate hydrate formers are soluble in water such as ۱-methylpiperidine and ۲-methylpiperidine. In this study, the Klauda-Sandler model was used to model sH hydrate stability conditions for ۱-methylpiperidine and ۲-methylpiperidine with methane as a help gas. The Peng-Robinson equation of state is used for the calculation of the fugacity of the help gas.The aqueous phase behavior containing these components is modeled using the NRTL activity coefficient model. This model show errors of less than ۲% which shows that the Klauda-Sandler model result is in acceptable agreement with the experimental data. Nevertheless, AAD% for ۱-methylpiperidine is ۰.۰۰۵۶% while it is ۱.۲% for the other component that implies the accuracy of the Klauda-Sandler hydrate model for ۱-methylpiperidine.

Gas Hydrate, Clathrate Hydrate, Structure H (sH), Water-Soluble Hydrate Former, ۱-Methylpiperidine, ۲-Methylpiperidine