Thermodynamics and Kinetics Study of Gas Hydrates in Presence of Ionic Liquids

, M.Sc. Thesis Sharif University of Technology Sahraei, Vahab (Author) ; Ghotbi, Cyrus (Supervisor) ; Taghikhani, Vahid (Supervisor) ; Nazari, Khodadad (Supervisor)

Abstract

Gas hydrates are ice-like clathrate compounds. Methane, carbon dioxie and natural gas compounds can form gas hydrate and plug pipelines, in order to preventing of gas hydrate formation, inhibitors like electrolytes are added to the natural gas pipelines. In this work a model proposed to predict the hydrate formation conditions in presence of some inhibitors such as NaCl, KCl, NaBr, KBr, [BMIM][BF4] and [BMIM][Br]. So a new equation of state that can be applied to both electrolyte and associating solutions called GV-SAFT-MSA is developed. Two dialkylimidazolium ionic liquids [BMIM][BF4] and [BMIM][MS] have been investigated for their potential application as novel gas hydrate inhibitors. The...

Thermodynamic Modeling of Gas Hydrates Formation In The Presence of Ionic Liquids

, M.Sc. Thesis Sharif University of Technology Rabanimehr, Fayaze (Author) ; Taghikhani, Vahid (Supervisor) ; Ghotbi, Siroos (Supervisor) ; Forounchi, Massoud (Supervisor)

Abstract

Gas hydrates are ice-like clathrate compounds. Methane and carbon dioxide can form gas hydrate and plug pipelines, in order to preventing of gas hydrate formation, inhibitors like salts and alcohols are added to the natural gas pipelines. In this work a molecular thermodynamic model based on statistical mechanics, is employed to predict the hydrate formation conditions for carbon dioxide and methane in the presence of aqueous ionic liquid solutions. The statistical model of Van der Waals and Platteeuw mixed with Holder model is employed for hydrate phase. An equation of state applicable to the systems containing electrolyte developed by coupling the statistical associating fluid theory...

Experimental Study of Effect of Nano-graphen Oxide on Methane Hydrate Formation Rate and Storage Capacity

, M.Sc. Thesis Sharif University of Technology Montazeri, Vahab (Author) ; Baghalha, Morteza (Supervisor) ; Ramazani, Ahmad (Supervisor) ; Zarenezhad, Bahman (Co-Advisor)

Abstract

According to the importance of conversion and transmission of energy, and introduction of hydrate formation process as an alternative method, in this study, the nano-graphene oxide is used to increase the rate if methane gas hydrates formation. The experiments were performed at different concentrations of 30 to 70 ppm and the results were compared with pure water. The effect of temperature and pressure on hydrate formation at temperatures of 1 and 2˚C and pressures of 48 and 53 bar were studied. And it was found that nano-graphene oxide can be used to accelerate the methane hydrates formation. The effect of ultrasonic on methane hydrate formation has been studied that it was found that the...