Equilibrium conditions for clathrate hydrates formed from carbon dioxide or ethane in the presence of aqueous solutions of 1,4-dioxane and 1,3-dioxolane

2014 ◽  
Vol 384 ◽  
pp. 95-99 ◽  
Author(s):  
Tatsuo Maekawa
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solutions ◽  
Clathrate Hydrates ◽  
Equilibrium Conditions

scholarly journals Semi-clathrate hydrate phase stability conditions for methane + TetraButylAmmonium Bromide (TBAB)/TetraButylAmmonium Acetate (TBAA) + water system: Experimental measurements and thermodynamic modeling

2021 ◽  
Vol 76 ◽  
pp. 75
Author(s):  
Hamideh Irannezhad ◽  
Jafar Javanmardi ◽  
Ali Rasoolzadeh ◽  
Khayyam Mehrabi ◽  
Amir H. Mohammadi
Keyword(s):  
Phase Equilibrium ◽  
Aqueous Solutions ◽  
Mass Fraction ◽  
Tetrabutylammonium Bromide ◽  
Clathrate Hydrate ◽  
Clathrate Hydrates ◽  
Stability Conditions ◽  
Equilibrium Conditions ◽  
Hydrate Phase ◽  
Mass Fractions

One of the promising applications of clathrate/gas hydrates is the transport and storage of natural gas. Semi-clathrate hydrates have received more attention due to milder pressure/temperature stability conditions compared to ordinary clathrate hydrates. The most commonly reported semi-clathrate hydrates are formed from a combination of gas + water + quaternary ammonium salts. In this work, a total of 53 equilibrium data for semi-clathrate hydrates of methane + TetraButylAmmonium Bromide (TBAB)/TetraButylAmmonium Acetate (TBAA) aqueous solutions were experimentally measured. For TBAB, three concentrations including 0.0350, 0.0490, and 0.1500 mass fractions were used. For TBAA, a solution with a 0.0990 mass fraction was used. Additionally, the modified Chen–Guo model was applied to calculate the hydrate phase equilibrium conditions of methane + TBAB/TBAA aqueous solutions. The model can accurately calculate the aforementioned semi-clathrate hydrate phase equilibrium conditions with the Average Absolute Deviations ((AAD)T and (AAD)P) of 0.1 K and 0.08 MPa, respectively. The temperature increments for 0.0350, 0.0490, and 0.1500 mass fractions of TBAB are 7.7, 9.4, and 13.5 K, respectively. This value for 0.0990 mass fraction of TBAA is 6.2 K. Therefore, it is concluded that TBAB is a stronger hydrate promoter compared to TBAA.

Phase Equilibria of Methane and Carbon Dioxide Clathrate Hydrates in the Presence of Aqueous Solutions of Tributylmethylphosphonium Methylsulfate Ionic Liquid

2011 ◽  
Vol 56 (9) ◽  
pp. 3620-3629 ◽  
Author(s):  
Kaniki Tumba ◽  
Prashant Reddy ◽  
Paramespri Naidoo ◽  
Deresh Ramjugernath ◽  
Ali Eslamimanesh ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Aqueous Solutions ◽  
Phase Equilibria ◽  
Clathrate Hydrates
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