Kinetic Study on the Process of Cyclopentane + Methane Hydrate Formation in NaCl Solution

Lv, Qiu-Nan; Song, Yongchen; Li, Xiao-Sen

doi:10.1021/acs.energyfuels.5b02634

Cited by 10 publications

(22 citation statements)

References 29 publications

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“…During further growth of the hydrate, the CO 2 gas diffused into the inside surface of the shell and water diffused to the outer surface of shell . More vigorous stirring could promote CO 2 gas dissolution and dispersion into the solution and enhance the mass transfer rate . According to Sloan, the collision of a hydrate particle with another water droplet could seed hydrate growth in the droplet.…”

Section: Resultsmentioning

confidence: 99%

“…Many researchers have studied the hydrate induction time for gases in pure water. ,,,, The main influencing factors are subcooling, driving force, memory effect, stirring rate, and gas composition. ,− However, hydrate formation in crude oil or in water-in-oil emulsion may not be the same as the process in pure water, as for example there will be differences in the heat and mass transfer. − So it is essential to study the hydrate induction time in water-in-oil emulsion.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Induction Time of Hydrate Formation in Water-in-Oil Emulsions

Zheng

Huang

Wang

et al. 2017

Ind. Eng. Chem. Res.

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Blockage of pipelines due to hydrate formation is a major problem for subsea flow assurance. Induction time for hydrate formation from the multiphase system within a pipeline is a critical parameter to determine whether hydrates may form at a given time. In this work, the induction time for hydrate formation in water-in-oil emulsions was investigated under different conditions. For this purpose, an autoclave with an online viscometer was designed and built. Based on the viscosity variation observed in the experiments during hydrate formation, a new avenue for defining induction time is proposed, which should be more convenient for determining the hydrate formation time in some pipelines. As hydrate formation in emulsions is more complicated than in pure water, the effects of several factors were considered in this study, including water cut of the emulsions, shear rate, driving force, and memory effect. Additionally, wax precipitation is also a common problem in subsea pipelines and can impact flow assurance when hydrate formation and wax precipitation both occur. Consequently, the effect of wax solid particles on hydrate formation was also considered in this work. The presence of wax particles is observed to impede hydrate formation. In this work, it is determined from induction time that the hydrate formation is initiated at the water–oil surface for water-in-oil emulsion. Moreover, the memory effect can shorten induction times of hydrate formation due to the remaining small CO2 bubbles at the surface of water droplets.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Induction Time of Hydrate Formation in Water-in-Oil Emulsions

Zheng

Huang

Wang

et al. 2017

Ind. Eng. Chem. Res.

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“…By comparison of three different cyclopentane derivatives on CO 2 hydrate formation examined by Hong et al, cyclopentane had a milder phase equilibrium condition in 3.5 wt % NaCl solution compared to cyclopentanone and cyclopentanol . The positive influence of cyclopentane on the rate of CH 4 hydrate in the presence of 3.5 wt % NaCl was shown by Lv and co-workers . The hydrate dissociation condition of (CO 2 + cyclopentane) in the electrolyte aqueous solution of NaCl (up to 20 wt %) was reported by Ngema et al They found that NaCl shifts the thermodynamic condition of hydrate formation to lower temperatures and higher pressures.…”

Section: Introductionmentioning

confidence: 83%

“…33 The positive influence of cyclopentane on the rate of CH 4 hydrate in the presence of 3.5 wt % NaCl was shown by Lv and co-workers. 34 The hydrate dissociation condition of (CO 2 + cyclopentane) in the electrolyte aqueous solution of NaCl (up to 20 wt %) was reported by Ngema et al 29 They found that NaCl shifts the thermodynamic condition of hydrate formation to lower temperatures and higher pressures. Lee et al revealed that the addition of 3.5 wt % NaCl hinders the capture of CO 2 into the hydrate phase.…”

Section: Introductionmentioning

confidence: 85%

Investigation of the Effect of NaCl on the Kinetics of R410a Hydrate Formation in the Presence and Absence of Cyclopentane with Potential Application in Hydrate-Based Desalination

Pahlavanzadeh

Javidani

Ganji³

et al. 2020

Ind. Eng. Chem. Res.

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Serious issues regarding the scarcity of freshwater encouraged researchers to work on various methods for seawater desalination. Hydrate-based desalination (HBD) is a novel method that has received investigators’ attention due to its outstanding properties. According to the literature, refrigerant hydrates have great potential to be employed in the HBD process because of their highly moderate phase equilibrium. The main purpose of the current study is to investigate the influence of different concentrations of NaCl (0, 1, 3.5, 5, and 8 wt %) on the major kinetic parameters of R410a refrigerant hydrate formation in the presence and absence of cyclopentane with the concentration of 0.5 mol % as a coformer. The experiments were performed in a stirred laboratory reactor at an initial temperature of 278.15 K and initial pressures of 0.9 and 1 MPa. The measurements of induction time and mole of gas consumption show that NaCl increases the induction time and decreases the amount of gas consumption. However, the addition of 0.5 mol % cyclopentane decreases the induction time slightly and increases the final amount of gas consumed. Besides, despite the fact that cyclopentane decreases the initial rate of gas uptake, it could promote the amount of gas consumption during hydrate formation. The results of the water-to-hydrate conversion ratio illustrated that NaCl with concentrations up to 5 wt % exhibits an insignificant decrease of water-to-hydrate conversion, while 8 wt % NaCl decreases this parameter down to 51.48%. Moreover, the positive effect of cyclopentane on the growth stage was revealed by determination of the apparent rate constant of hydrate growth. This study provides useful data for designing and understanding the HBD process via R410a hydrate formation.

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“…Cha et al suggested that cyclopentane–CO 2 and cyclohexane–CO 2 binary hydrate have mild hydrate formation temperature and fast formation kinetics than CO 2 simple hydrate. Chen et al measured the phase equilibrium data and dissociation enthalpies for cyclopentane + methane + water + NaCl systems and Lv et al studied the formation kinetics of the same systems. Also, Cai et al , investigated the thermodynamics and kinetics of a CP–methane binary hydrate in fresh water and brine solutions separately.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibrium of Cyclopentane + Carbon Dioxide Binary Hydrates in Aqueous Sodium Chloride Solutions

et al. 2017

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This work aims to report the cyclopentane(CP)-carbon dioxide binary sII hydrate phase equilibrium data in the presence of aqueous sodium chloride solutions at five different mass fractions (0.00, 0.035, 0.07, 0.10, 0.15 and 0.25) in the range of temperature from (269.8 to 292.4) K and pressure from (1.18 to 3.33) MPa. An isochoric pressure-search method is applied for the experimental measurements. The obtained equilibrium data of CO 2 hydrate in pure water are compared with those from the literature. The good agreement validates that our experimental apparatus and approach are well-established and reliable. It is indicated that the inhibiting effect of NaCl yields to the promotion effect of cyclopentane except for the case of 0.25 mass fraction of aqueous NaCl solution.

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Kinetic Study on the Process of Cyclopentane + Methane Hydrate Formation in NaCl Solution

Cited by 10 publications

References 29 publications

Induction Time of Hydrate Formation in Water-in-Oil Emulsions

Induction Time of Hydrate Formation in Water-in-Oil Emulsions

Investigation of the Effect of NaCl on the Kinetics of R410a Hydrate Formation in the Presence and Absence of Cyclopentane with Potential Application in Hydrate-Based Desalination

Phase Equilibrium of Cyclopentane + Carbon Dioxide Binary Hydrates in Aqueous Sodium Chloride Solutions

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