Equilibrium Data for Methane, Ethane, and Propane Incipient Hydrate Formation in Aqueous Solutions of Ethylene Glycol and Diethylene Glycol

Abstract

Equilibrium experimental data for methane, ethane, and propane incipient hydrate formation in the presence of diethylene glycol and that for propane in the presence of ethylene glycol were obtained. Fortysix experiments were performed in the temperature and pressure ranges (264 to 283) K and (0.181 to 4.5) MPa, respectively, using the pressure search method. The experimental data were compared with predictions made using a hydrate equilibrium calculation method. The average deviation between the experimental data and calculated values was found to be 4.91%.

Modeling Hydrate Dissociation Curves in the Presence of Hydrate Inhibitors with a Modified CPA EoS

“…wt % refers to weight percentage of inhibitor in aqueous solution. ○, Ng and Robinson; Δ, Robinson and Ng; ×, Mohammadi and Richon; ◊, Afzal et al; □, Mahmoodaghdam and Bishnoi; +, Mohammadi and Richon; *, Ross and Toczylkin; ∇, Haghighi et al…”

“…wt % refers to weight percentage of inhibitor in the aqueous phase. ○, Ng and Robinson; Δ, Mohammadi et al; □, Maekawa; ◊, Mahmoodaghdam and Bishnoi; ×, Afzal et al…”

Predicting Methane Hydrate Equilibrium Conditions in Ethylene Glycol and NaCl/KCl/CaCl2 Aqueous Solutions by Water Activity Measurement

“…10 equilibrium of methane hydrate in ethylene glycol and diethylene glycol solutions. 11 Haghighi et al 12 measured the equilibrium conditions of methane gas and natural gas hydrate in EG solutions. Although the experimental data are reliable, the measurements costs could not be ignored, and the results could not be applied to solutions of other compositions.…”

“…Before this, Masoudi et al measured the methane hydrate equilibrium conditions in NaCl/KCl and ethylene glycol (EG) aqueous solutions . Mahmoodaghdam and Bishnoi measured the equilibrium of methane hydrate in ethylene glycol and diethylene glycol solutions . Haghighi et al measured the equilibrium conditions of methane gas and natural gas hydrate in EG solutions.…”

Experimental study of separation of ammonia synthesis vent gas by hydrate formation

“…We studied the hydrate-forming conditions of methane in (NH 3 +H 2 O) system and found that the hydrate-forming pressure of methane is too high to be practically applicable. Tetrahydrofuran (THF) is miscible with water and could form structure II hydrate at a molar THF to H 2 O ratio of 1:17 (Mahmoodaghdam and Bishnoi, 2002). THF is proved to be a hydrate stabilizer (Hashimoto…”