Experimental and modelling studies on the effects of nanofluids (SiO2, Al2O3, and CuO) and surfactants (SDS and CTAB) on CH4 and CO2 clathrate hydrates formation

Pahlavanzadeh, Hassan; Khanlarkhani, Mehrdad; Rezaei, Sajjad; Mohammadi, Amir H.

doi:10.1016/j.fuel.2019.05.010

Cited by 66 publications

(46 citation statements)

References 56 publications

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“…Thus, the formation effect of hydrate will change accordingly. This was consistent with the observations of Pahlavanzadeh et al [38] and Partoon et al [39]. The minimum concentration of surfactant micelle formation is the critical micelle concentration (CMC).…”

Section: Macroscopic Experimentssupporting

confidence: 92%

“…Therefore, the 0.05 wt.% SDS concentration had the sh duction time, and the promotion effect of CO2 hydrate formation was the most As a result of the salt removal effect of hydrate growth, water in the solution w sumed for hydrate growth, which resulted in an increased concentration of SDS a NaCl is a thermodynamic inhibitor; therefore, a high concentration of SDS will als the formation of hydrates. Thus, the formation effect of hydrate will change acco This was consistent with the observations of Pahlavanzadeh et al [38] and Parto [39]. The minimum concentration of surfactant micelle formation is the critica concentration (CMC).…”

Section: Macroscopic Experimentssupporting

confidence: 86%

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Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate

et al. 2021

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Due to high efficiency and low cost, hydrate-based desalination is investigated as a pretreatment method for seawater desalination. To improve the formation rate of hydrates, the effect of sodium dodecyl sulfate (SDS) on CO2 hydrate formation from a 3.5 wt.% NaCl solution was measured at 275 K and 3 MPa. X-ray diffraction (XRD) and cryo-scanning electron microscopy (cryo-SEM) were used to measure the crystal structure and micromorphology of the formed hydrates. The results showed that the induction time of CO2 hydrate formation reduced from 32 to 2 min when SDS concentration increased from 0.01 to 0.05%, the hydrate conversion rate increased from 12.06 to 23.32%, and the remaining NaCl concentration increased from 3.997 to 4.515 wt.%. However, as the SDS concentration surpassed 0.05 wt.%, the induction time increased accompanied by a decrease in the hydrate conversion rate. XRD showed that the CO2 hydrate was a structure I hydrate, and SDS had no influence on the hydrate structure. However, cryo-SEM images revealed that SDS promoted the formation of hydrates by increasing the specific surface area of the formed hydrates and folds; rods and clusters could be found on the surface of the CO2 hydrate. Thus, the best SDS concentration for promoting CO2 hydrate formation was approximately 0.05 wt.%; desalination was most efficient at this concentration.

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Section: Macroscopic Experimentssupporting

confidence: 92%

Section: Macroscopic Experimentssupporting

confidence: 86%

Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate

et al. 2021

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“…They asserted that at low concentrations (0.1-0.2-0.3 wt.%), this additive acted as a kinetic promoter for the process. A similar trend was found in [32] with the addition of low concentrations of CuO (0.1-0.3-0.5 wt.%).…”

Section: Cusn12 Powdersupporting

confidence: 80%

Methane and Carbon Dioxide Hydrate Formation and Dissociation in Presence of a Pure Quartz Porous Framework Impregnated with CuSn12 Metallic Powder: An Experimental Report

et al. 2021

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Hydrate formation and dissociation processes were carried out in the presence of a pure quartz porous medium impregnated with a metallic powder made with a CuSn12 alloy. Experiments were firstly made in the absence of that powder; then, different concentrations were added to the porous medium: 4.23 wt.%, 18.01 wt.%, and 30.66 wt.%. Then, the hydrate dissociation values were compared with those present in the literature. The porous medium was found to act as an inhibitor in the presence of carbon dioxide, while it did not alter methane hydrate, whose formation proceeded similarly to the ideal trend. The addition of CuSn12 promoted the process significantly. In particular, in concentrations of up to 18.01 wt.%, CO2 hydrate formed at milder conditions until it moved below the ideal equilibrium curve. For methane, the addition of 30.66 wt.% of powder significantly reduced the pressure required to form hydrate, but in every case, dissociation values remained below the ideal equilibrium curve.

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“…Li et al (2006) suggested the SAFT in conjunction with the vdW-P to predict the behavior of single hydrates (C 1 -C 3 , and CO 2 ) in the presence of methanol and glycerol as hydrate inhibitors. However, CPA application for the vapor-liquid equilibria (VLE) (Folas et al 2006) and liquid-liquid equilibria (LLE) (Oliveira et al 2007) of natural gas hydrate composition has been investigated before 2007; Kontogeorgis et al (2007) were the first ones to combine CPA EoS with the vdW-P model and suggested reliable models for the phase behavior of water, alcohols, and natural gas components. Tavasoli et al (2016) investigated the influence of cyclic hydrocarbons (i.e., benzene and cyclohexane) on the methane and CO 2 hydrates.…”

Section: Resultsmentioning

confidence: 99%

An insight into the role of the association equations of states in gas hydrate modeling: a review

et al. 2020

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Encouraged by the wide spectrum of novel applications of gas hydrates, e.g., energy recovery, gas separation, gas storage, gas transportation, water desalination, and hydrogen hydrate as a green energy resource, as well as CO2 capturing, many scientists have focused their attention on investigating this important phenomenon. Of course, from an engineering viewpoint, the mathematical modeling of gas hydrates is of paramount importance, as anticipation of gas hydrate stability conditions is effective in the design and control of industrial processes. Overall, the thermodynamic modeling of gas hydrate can be tackled as an equilibration of three phases, i.e., liquid, gas, and solid hydrate. The inseparable component in all hydrate systems, water, is highly polar and non-ideal, necessitating the use of more advanced equation of states (EoSs) that take into account more intermolecular forces for thermodynamic modeling of these systems. Motivated by the ever-increasing number of publications on this topic, this study aims to review the application of associating EoSs for the thermodynamic modeling of gas hydrates. Three most important hydrate-based models available in the literature including the van der Waals–Platteeuw (vdW–P) model, Chen–Guo model, and Klauda–Sandler model coupled with CPA and SAFT EoSs were investigated and compared with cubic EoSs. It was concluded that the CPA and SAFT EoSs gave very accurate results for hydrate systems as they take into account the association interactions, which are very crucial in gas hydrate systems in which water, methanol, glycols, and other types of associating compounds are available. Moreover, it was concluded that the CPA EoS is easier to use than the SAFT-type EoSs and our suggestion for the gas hydrate systems is the CPA EoS.

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Experimental and modelling studies on the effects of nanofluids (SiO2, Al2O3, and CuO) and surfactants (SDS and CTAB) on CH4 and CO2 clathrate hydrates formation

Cited by 66 publications

References 56 publications

Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate

Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate

Methane and Carbon Dioxide Hydrate Formation and Dissociation in Presence of a Pure Quartz Porous Framework Impregnated with CuSn12 Metallic Powder: An Experimental Report

An insight into the role of the association equations of states in gas hydrate modeling: a review

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