Experimental study and thermodynamic modeling of clathrate hydrate stability conditions in carbon dioxide plus cyclopentane plus water system: Retrograde region

被引:8
|
作者
Raeisi, Maryam [1 ]
Mohammadifard, Mina [1 ]
Javanmardi, Jafar [1 ]
Nasrifar, Khashayar [2 ]
Mohammadi, Amir H. [3 ]
机构
[1] Shiraz Univ Technol, Dept Chem Petr & Gas Engn, Shiraz, Iran
[2] Sultan Qaboos Univ, Dept Petr & Chem Engn, Muscat, Oman
[3] Univ KwaZulu Natal, Sch Engn, Discipline Chem Engn, Howard Coll Campus,King George Ave 5, ZA-4041 Durban, South Africa
关键词
Gas hydrate; Carbon dioxide; Gibbs free energy minimization; Cyclopentane; Retrograde region; Thermodynamic model; EQUATION-OF-STATE; VAPOR-LIQUID-EQUILIBRIA; GAS HYDRATE; DISSOCIATION CONDITIONS; CO2; CAPTURE; ECONOMIC-EVALUATION; PHASE-EQUILIBRIA; METHANE; MIXTURES; PREDICTION;
D O I
10.1016/j.molliq.2019.112083
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, hydrate dissociation conditions for the carbon dioxide + cyclopentane + water system were measured. The pressure-search method at constant volume was employed to measure equilibrium conditions in the temperature range from 287.4-293.1 K and pressure range from 0.99-4.78 MPa. The results exhibit a retrograde behavior at pressures above 4 MPa for this system. Also, the experiments show that cyclopentane would significantly promote carbon dioxide hydrate stability conditions. In addition, based on the minimization of Gibbs free energy, a multiphase flash calculation was performed using the van der Waals and Platteeuw (vdW-P) solid solution theory along with the cubic plus association (CPA) equation of state to predict gas hydrate stability conditions. Modeling results are found in good agreement with the experimental data even in the retrograde region. (C) 2019 Published by Elsevier B.V.
引用
收藏
页数:9
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