involving hydrate volume and composition Saheb Maghsoodloo, Baptiste - PowerPoint PPT Presentation

Non-equilibrium crystallization of mixed gas hydrates involving hydrate volume and composition Saheb Maghsoodloo, Baptiste Bouillot, Jean-Michel Herri Ecole des Mines de Saint-Etienne, SPIN, CNRS 5307, LGF, F-42023 Saint-Etienne, France

Introduction and Problematics What roles do clathrate hydrates play? When and how much (volume) do gas hydrates form?  Flow assurance  Energy resources  Gas separation  Water desalination Is thermodynamic equilibrium reached?  CO 2 capture and  Gas storage and sequestration transportation How does the rate of crystallization affect the final state? Thermodynamics and crystallization mechanisms of clathrate hydrates 2

Experimental section Materials Set-up Procedures P CH 4 -C 3 H 8 C 2 H 6 -C 3 H 8 1. Cryostat 2. Reactor 2L, 100bar Quick Slow 3. Windows 12 * 2cm 4. Gas bottles CO 2 -C 3 H 8 5. Agitator 6. Temperature sensors Pt 100 7. Sampling liquid 8. HPLC pump T 9. Granulometric sensors LASENTECH 10. Sampling gas ROLSI 11. Gas chromatograph 12. Air supply, He 13. Display pressure and temperature 14. Computer recording data 3

Results and Disscussion Hydrate Density Water Conversion +13% +32% 4

Modeling 198 Equilibrium pressure points for the mixtures involving propane Results of thermodynamic model for quick and slow crystallization vdW & Kihara Platteeuw Parameters Hydrate Equilibrium CO2-C3 Composition Pressure Slow 9,6 % 12,3 % ε Optimization a Quick 19,30 % 15,5 % σ Propane 𝜻 =195.0 σ =3.34 a=0.6502 5

Conclusion Pressure Different rate of Volume Quick crystallization Slow C 3 H 8 content Slow Less kinetic Thermodynamic crystallization effects equilibrium 6

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