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Effect of Ionic Liquids on the Process of Gas Hydrates Formation

Moradi, Mohammad Reza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41354 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Siroos; Taghikhani, Vahid; Ahmadi, Amir Naser
  7. Abstract:
  8. In this study thermodynamics and kinetics effects of two ionic liquids (ILs) on the formation and dissociation of methane and carbon dioxide hydrates were investigated. The ILs used in this study are 1-butyle-3-metylimidazolium tetrafluoroborate, [Bmim][BF4], and 1-butyle-3-metylimidazolium methyl sulfate, [Bmim][MS]. At the first step of experimental section, the tetrahydrofuran (THF) was used in atmospheric pressure. The structure of THF hydrate is similar to natural gas hydrate; therefore it is used as a model for studying the properties and investigation of inhibitors effects on gas hydrates. In order to consider the effects of foregoing ILs on the formation and dissociation of gas hydrates, several experiments were carried out in high pressure conditions. From thermodynamic point of view these ILs can inhibit methane and carbon dioxide hydrate formation at a given temperature by shifting the dissociation curve to the left hand side. Also it was observed that additives increase the induction time for methane hydrate as a kinetic inhibitor, while decrease the induction time for carbon dioxide hydrate as a kinetic promoter. After kinetic study of hydrate formation, in order to establish a kinetic model for gas hydrate formation, the mechanism based on several series of chemical reactions to predict the changes of pressure over time was used. The results showed that the model used in this work can predict the experimental data during the nucleation and growth with good accuracy
  9. Keywords:
  10. Inhibitor ; Promoter ; Kinetics Modeling ; Ionic Liquids ; Gas Hydrate

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