Universal correlation for gas hydrates suppression temperature of inhibited systems: I. Single salts

Hu, Yue; Lee, Bo Ram; Sum, Amadeu K.

doi:10.1002/aic.15846

Cited by 57 publications

(71 citation statements)

References 47 publications

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“…Note that Hu et al (2017) succeeded in using a quite similar equation to correlate suppression temperature of gas hydrate in single salt inhibited system, although they neglect ΔC p , and provide an equation for

Δ T / T_{0} T

( ΔT being the suppression temperature, T and T 0 being the equilibrium temperature with and without inhibitor, respectively) …”

Section: Resultsmentioning

confidence: 99%

Experimental measurement and thermodynamic modeling of cyclopentane hydrates with NaCl, KCl, CaCl₂, or NaCl‐KCl present

et al. 2018

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Consistent phase equilibrium data for cyclopentane hydrates in presence of salts are vitally important to many industries, with particular interest to the field of hydrate-based water separation via cyclopentane hydrate crystallization such as desalination. However, there are very little experimental equilibrium data, and no thermodynamic prediction tools. Hence, we set up a method to generate a great deal of much needed equilibrium data for cyclopentane hydrates in diverse saline solutions with a wide range of salt concentrations. Our method does furnish verified, reliable and accurate equilibrium data. Plus, three thermodynamic approaches are developed to predict equilibrium, and provide tools for simulations, by considering the kind of salt and concentrations. All three models are in very good accordance with experimental data. One method, using a new correlation between occupancy factor and water activity, might be the best way to obtain consistent, quick, and accurate dissociation temperatures of cyclopentane hydrate in brine.a Dh b2L w j T 0 ;P 0 5 Dl b2I w j T 0 ;P 0 -6011, where 6011 is the enthalpy of ice (J mol 21 ).

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Δ T / T_{0} T

( ΔT being the suppression temperature, T and T 0 being the equilibrium temperature with and without inhibitor, respectively) …”

Section: Resultsmentioning

confidence: 99%

Experimental measurement and thermodynamic modeling of cyclopentane hydrates with NaCl, KCl, CaCl₂, or NaCl‐KCl present

et al. 2018

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“…Hu et al 42,43 respectively. ΔH diss is the hydrate dissociation enthalpy, n the hydration number, and a w the water activity.…”

Section: Hu-lee-sum (Hls) Correlationmentioning

confidence: 99%

Implementing Cyclopentane Hydrates Phase Equilibrium Data and Simulations in Brine Solutions

Ho-Van

Bouillot

Douzet

et al. 2018

Ind. Eng. Chem. Res.

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Cyclopentane hydrates-based salt removal is considered to be a possible promising technology for desalination. In order to optimize such processes, phase equilibrium data of Cyclopentane Hydrates (CPH) in saline solutions are crucial. Lamentably, these data sets are still incomplete.Therefore, earlier we published a limited experimental and modeling study on CPH equilibrium with some salts present.This study extends experimental equilibrium to four more common brine systems: Na 2 SO 4 , MgCl 2 , MgCl 2 -NaCl, or MgCl 2 -NaCl-KCl at various salt concentrations. Importantly, four thermodynamic approaches: the Standard Freezing Point Depression equation based (SFPD), Hu-Lee-Sum (HLS) correlation, and the two van der Waals and Platteuw-based Kihara and Activity-Based Occupancy Correlation (ABOC) methods, are compared to this new set of experimental data. Results show that simulations agree adequately with measured data. Nonetheless, the ABOC method is the best model to reproduce rapid and consistent equilibrium data of CPH in brine, whatever the electrolytes involved.

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“…In the first paper part of this study, a universal correlation was introduced to predict the hydrate dissociation conditions for any single salt systems for sI hydrates. Natural gas, a hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes and noncombustible gases (e.g., carbon dioxide, nitrogen, hydrogen sulfide), naturally occurs in oil/gas production, and transportation.…”

Section: Introductionmentioning

confidence: 99%

“…Pure methane forms sI hydrates, while sII hydrates are typically formed for natural gas due to the presence of propane and butanes. Therefore, it is necessary to extend the developed correlation from our first article for the prediction of sII hydrate phase equilibrium. Furthermore, inorganic salts are thermodynamic hydrate inhibitors, shifting the hydrate dissociation conditions to lower temperature and higher pressure through strong electrostatic interactions between water and dissolved ions.…”

Section: Introductionmentioning

confidence: 99%

“…In our first paper, the existing correlations used to estimate the hydrate suppression temperature in brine systems were reviewed and assessed, including the correlations by McCain, Yousif and Young, Mohammadi and Tohidi, all of which can also be used for mixed salts systems. However, these correlations are all limited by pressure, salt species, and concentration.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Universal correlation for gas hydrates suppression temperature of inhibited systems: II. Mixed salts and structure type

Lee

Sum

2018

AIChE Journal

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The first paper of this study discussed the development of the Hu-Lee-Sum (HLS) correlation and demonstrated the generality and universality of the correlation to predict structure I hydrates suppression temperature for any single salt system. However, natural gas commonly forms structure II hydrates, and mixed salts naturally occur in oil and gas production. Therefore, reliable prediction of structure II hydrates suppression temperature in presence of mixed salts over a wide range of pressure is considerably important. The contribution for each salt in salt mixtures is accounted for in the effective mole fraction to extend the HLS correlation for mixed salts systems. Moreover, a parameter (a) is introduced to account for the effect of hydrate structure on the hydrate suppression temperature. Herein, the HLS correlation is further shown to be universal and reliable to predict the hydrate suppression temperature for more complicated systems for mixed gases and mixed salts. a In the remainder of the article, a particular reference will be cited abbreviated as: salt composition-reference-gas. For example: a-2-CO 2 corresponds to the carbon dioxide hydrate data with 3 wt % NaCl and 3 wt % KCl from Dholabhai et al., 1993. a In the remainder of the article, a particular reference will be cited abbreviated as: salt composition-reference-gas. For example, a-1-80C1/20CO 2 corresponds to the mixed gas (20 mol % carbon dioxide 1 80 mol % methane) hydrate data with 5 wt % NaCl from Bishnoi et al., 1996. b Gas composition will be abbreviated as NG.

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Universal correlation for gas hydrates suppression temperature of inhibited systems: I. Single salts

Cited by 57 publications

References 47 publications

Experimental measurement and thermodynamic modeling of cyclopentane hydrates with NaCl, KCl, CaCl₂, or NaCl‐KCl present

Experimental measurement and thermodynamic modeling of cyclopentane hydrates with NaCl, KCl, CaCl₂, or NaCl‐KCl present

Implementing Cyclopentane Hydrates Phase Equilibrium Data and Simulations in Brine Solutions

Universal correlation for gas hydrates suppression temperature of inhibited systems: II. Mixed salts and structure type

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Universal correlation for gas hydrates suppression temperature of inhibited systems: I. Single salts

Cited by 57 publications

References 47 publications

Experimental measurement and thermodynamic modeling of cyclopentane hydrates with NaCl, KCl, CaCl2, or NaCl‐KCl present

Experimental measurement and thermodynamic modeling of cyclopentane hydrates with NaCl, KCl, CaCl2, or NaCl‐KCl present

Implementing Cyclopentane Hydrates Phase Equilibrium Data and Simulations in Brine Solutions

Universal correlation for gas hydrates suppression temperature of inhibited systems: II. Mixed salts and structure type

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Experimental measurement and thermodynamic modeling of cyclopentane hydrates with NaCl, KCl, CaCl₂, or NaCl‐KCl present

Experimental measurement and thermodynamic modeling of cyclopentane hydrates with NaCl, KCl, CaCl₂, or NaCl‐KCl present