Insights into Kinetics of Methane Hydrate Formation in the Presence of Surfactants

Pandey, Jyoti Shanker; Daas, Yousef Jouljamal; Solms, Nicolas von

doi:10.3390/pr7090598

Cited by 27 publications

(42 citation statements)

References 32 publications

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“…During the memory run, different concentrations of SDS in solution are shown to eliminate the memory effect, reflected by lower T o values observed during the memory run at different CO 2 concentrations. SDS has shown similar behavior during the methane hydrate formation in the presence of SDS [25]. It is likely that a surfactant-based hydrate promoter eliminates memory effect during the nucleation, independent of the host molecule.…”

Section: Onset Temperature (T 0 ) and Sub Cooling (∆T Sub ) For Surfamentioning

confidence: 90%

“…The constant ramping method, with initial operating pressure 120 bar and temperature 25 • C, is selected to determine the onset of nucleation temperature (T o ). Methodology to calculate T o is discussed in our previous publication [25].…”

Section: Methodsmentioning

confidence: 99%

“…These P-T data are plotted against time to detect the flue gas hydrate formation in the presence of different solutions. Methodology to calculate the onset nucleation temperature, To, can be referred to other publications [25,26]. The rapid drop in pressure observed after To is the region of high growth where promoter concentration does not play a role.…”

Section: Methodsmentioning

confidence: 99%

“…The rocking cell is traditionally used to study the hydrate inhibitors to determine onset time and onset temperature, using constant temperature and constant ramping techniques. Recently, our group has demonstrated a successful experimental analysis for methane hydrate formation kinetics in the presence of SDS with rocking cells [25].…”

Section: Introductionmentioning

confidence: 99%

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Screening of Amino Acids and Surfactant as Hydrate Promoter for CO2 Capture from Flue Gas

2020

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In this study, the kinetics of flue gas hydrate formation in bulk water in the presence of selected amino acids and surfactants are investigated. Four amino acids (3000 ppm) are selected based on different hydropathy index. Constant-ramping and isothermal experiments at 120 bar pressure and 1 °C temperature are carried out to compare their hydrate promotion capabilities with surfactant sodium dodecyl sulfate (SDS) (500–3000 ppm) and water. Based on experimental results, we report the correlation between hydrate promotion capability of amino acids and their hydrophobicity. Hydrophobic amino acids show stronger flue gas hydrate promotion capability than water and hydrophilic amino acids. We discuss the controlling mechanisms to differentiate between promoters and inhibitors’ roles among the amino acids. Between 2000–3000 ppm concentrations, hydrophobic amino acids have near similar promotion capabilities as SDS. This research highlights the potential use of amino acids as promoters or inhibitors for various applications.

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Section: Onset Temperature (T 0 ) and Sub Cooling (∆T Sub ) For Surfamentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Screening of Amino Acids and Surfactant as Hydrate Promoter for CO2 Capture from Flue Gas

2020

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“…By depressurization method, gas hydrate of 1 m 3 causes decomposition and releases natural gas of 164 m 3 and water of 0.8 m 3 [1,2]. According to Omelchenko and Makogon [3], gas hydrate dissociation results in the formation of 45 × 10 6 m 3 water at the Messoyakha field.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Spontaneous Imbibition of Water into Hydrate Sediments Using Nuclear Magnetic Resonance Method

et al. 2020

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Field observations show that less than one percent of dissociation water can be produced during gas hydrate production, resulting from spontaneous water imbibition into matrix pores. What’s more, the hydrate sediments are easily dispersed in water, and it is difficult to carry out spontaneous imbibition experiments. At present, there is little research work on the imbibition capacity of hydrate sediments. In this paper, a new method of water imbibition is proposed for hydrate sediments, and nuclear magnetic resonance (NMR) technique is used to monitor water migration. The results show that as the imbibition time increases, the water is gradually imbibed into matrix pores. Water imbibition can cause dramatic changes in pore structure, such as microfracture initiation, fracture network generation and skeleton dispersion. When the imbibition time exceeds a critical value, many secondary pores (new large pores and micro-fractures) start to appear. When imbibition time exceeds the dispersion time, fracture networks are generated, eventually leading to dispersion of the sediment skeleton. The imbibition curves of hydrate sediments can be divided into two linear stages, which corresponds, respectively, to water imbibition of primary pores and secondary pores. The imbibition rate of secondary pores is significantly larger than that of primary pores, indicating that the generation of new fractures can greatly accelerate the imbibition rate. Research on the characteristics of water imbibition in hydrate sediments is important for optimizing hydrate production regime and increasing natural gas production.

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Doping amino acids with classical gas hydrate inhibitors to facilitate the hydrate inhibition effect at low dosages

2020

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The formation of gas hydrates in offshore subsea lines is a major flow assurance concern for the oil and gas industry. In this work, the thermodynamic hydrate inhibition (THI) effect of doping amino acids (AA) such as glycine (Gly), l‐alanine (Ala), and histidine (His) with classical gas hydrate inhibitors (CHI) such as methanol (Me), ethylene glycol (EG), and sodium chloride (NaCl) have been examined at diverse operating conditions. The experimental tests were carried out using rocking cell assembly [RC‐5] on pure methane gas at different pressure conditions (40–120 bars) using an equal ratio mixture (1:1) of AA and CHI at a low dosage (2 wt%). The computational three‐dimensional molecular models of AA and CHI were generated to examine electric charge distribution within these molecules and cognize the interaction mechanism between methane hydrates and AA. The experimental results indicate that Me and EG can synergize the THI effect of AA at a low dosage of 1 wt%. The AA doped with Me tend to provide better THI effect compared to AA doped with EG and NaCl. The experimental results also show that the doped AA Ala mixtures provide THI effect similar to pure CHI such as Me, EG, and NaCl at low dosage (2 wt%). © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Insights into Kinetics of Methane Hydrate Formation in the Presence of Surfactants

Cited by 27 publications

References 32 publications

Screening of Amino Acids and Surfactant as Hydrate Promoter for CO2 Capture from Flue Gas

Screening of Amino Acids and Surfactant as Hydrate Promoter for CO2 Capture from Flue Gas

Experimental Investigation of Spontaneous Imbibition of Water into Hydrate Sediments Using Nuclear Magnetic Resonance Method

Doping amino acids with classical gas hydrate inhibitors to facilitate the hydrate inhibition effect at low dosages

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