Influence of tetramethylammonium hydroxide on methane and carbon dioxide gas hydrate phase equilibrium conditions

Muhammad Saad Khan; Behzad Partoon; Cornelius B. Bavoh; Bhajan Lal; Nurhayati Bt Mellon

doi:10.1016/j.fluid.2017.02.011

Influence of tetramethylammonium hydroxide on methane and carbon dioxide gas hydrate phase equilibrium conditions

Muhammad Saad Khan, Behzad Partoon, Cornelius B. Bavoh, Bhajan Lal^*, Nurhayati Bt Mellon

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

118 Scopus citations

Abstract

In this experimental work, the phase boundaries of TMAOH + H₂O + CH₄ and TMAOH + H₂O + CO₂ hydrates are measured at different concentrations of aqueous TMAOH solution. The temperature-cycle (T-cycle) method is applied to measure the hydrate equilibrium temperature of TMAOH + H₂O + CH₄ and TMAOH + H₂O + CO₂ systems within the ranges of 3.5–8.0 MPa and 1.8–4.2 MPa, respectively. Results reveals that, TMAOH acts as a thermodynamic inhibitor for both gases. In the presence of 10 wt% of TMAOH, the inhibition effect appears to be very substantial for CO₂ with an average suppression temperature (ΔŦ) of 2.24 K. An ample inhibition influence is observed for CH₄ hydrate at 10 wt% with ΔŦ of 1.52 K. The inhibition effect of TMAOH is observed to increase with increasing TMAOH concentration. Confirmed via COSMO-RS analysis, the TMAOH inhibition effect is due to its hydrogen bonding affinity for water molecules. Furthermore, the calculated hydrate dissociation enthalpies in both systems revealed that TMAOH does not participate in the hydrate crystalline structure.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Fluid Phase Equilibria
Volume	440
DOIs	https://doi.org/10.1016/j.fluid.2017.02.011
State	Published - 25 May 2017
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

Ammonium based ionic liquids
COSMO-RS
Gas hydrate
Inhibitor
Phase equilibrium
TMAOH

ASJC Scopus subject areas

General Chemical Engineering
General Physics and Astronomy
Physical and Theoretical Chemistry

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@article{6000fa41b3d840679b9547af8fb23510,

title = "Influence of tetramethylammonium hydroxide on methane and carbon dioxide gas hydrate phase equilibrium conditions",

abstract = "In this experimental work, the phase boundaries of TMAOH + H2O + CH4 and TMAOH + H2O + CO2 hydrates are measured at different concentrations of aqueous TMAOH solution. The temperature-cycle (T-cycle) method is applied to measure the hydrate equilibrium temperature of TMAOH + H2O + CH4 and TMAOH + H2O + CO2 systems within the ranges of 3.5–8.0 MPa and 1.8–4.2 MPa, respectively. Results reveals that, TMAOH acts as a thermodynamic inhibitor for both gases. In the presence of 10 wt\% of TMAOH, the inhibition effect appears to be very substantial for CO2 with an average suppression temperature (ΔŦ) of 2.24 K. An ample inhibition influence is observed for CH4 hydrate at 10 wt\% with ΔŦ of 1.52 K. The inhibition effect of TMAOH is observed to increase with increasing TMAOH concentration. Confirmed via COSMO-RS analysis, the TMAOH inhibition effect is due to its hydrogen bonding affinity for water molecules. Furthermore, the calculated hydrate dissociation enthalpies in both systems revealed that TMAOH does not participate in the hydrate crystalline structure.",

keywords = "Ammonium based ionic liquids, COSMO-RS, Gas hydrate, Inhibitor, Phase equilibrium, TMAOH",

author = "Khan, \{Muhammad Saad\} and Behzad Partoon and Bavoh, \{Cornelius B.\} and Bhajan Lal and Mellon, \{Nurhayati Bt\}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

month = may,

day = "25",

doi = "10.1016/j.fluid.2017.02.011",

language = "English",

volume = "440",

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journal = "Fluid Phase Equilibria",

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TY - JOUR

T1 - Influence of tetramethylammonium hydroxide on methane and carbon dioxide gas hydrate phase equilibrium conditions

AU - Khan, Muhammad Saad

AU - Partoon, Behzad

AU - Bavoh, Cornelius B.

AU - Lal, Bhajan

AU - Mellon, Nurhayati Bt

PY - 2017/5/25

Y1 - 2017/5/25

N2 - In this experimental work, the phase boundaries of TMAOH + H2O + CH4 and TMAOH + H2O + CO2 hydrates are measured at different concentrations of aqueous TMAOH solution. The temperature-cycle (T-cycle) method is applied to measure the hydrate equilibrium temperature of TMAOH + H2O + CH4 and TMAOH + H2O + CO2 systems within the ranges of 3.5–8.0 MPa and 1.8–4.2 MPa, respectively. Results reveals that, TMAOH acts as a thermodynamic inhibitor for both gases. In the presence of 10 wt% of TMAOH, the inhibition effect appears to be very substantial for CO2 with an average suppression temperature (ΔŦ) of 2.24 K. An ample inhibition influence is observed for CH4 hydrate at 10 wt% with ΔŦ of 1.52 K. The inhibition effect of TMAOH is observed to increase with increasing TMAOH concentration. Confirmed via COSMO-RS analysis, the TMAOH inhibition effect is due to its hydrogen bonding affinity for water molecules. Furthermore, the calculated hydrate dissociation enthalpies in both systems revealed that TMAOH does not participate in the hydrate crystalline structure.

AB - In this experimental work, the phase boundaries of TMAOH + H2O + CH4 and TMAOH + H2O + CO2 hydrates are measured at different concentrations of aqueous TMAOH solution. The temperature-cycle (T-cycle) method is applied to measure the hydrate equilibrium temperature of TMAOH + H2O + CH4 and TMAOH + H2O + CO2 systems within the ranges of 3.5–8.0 MPa and 1.8–4.2 MPa, respectively. Results reveals that, TMAOH acts as a thermodynamic inhibitor for both gases. In the presence of 10 wt% of TMAOH, the inhibition effect appears to be very substantial for CO2 with an average suppression temperature (ΔŦ) of 2.24 K. An ample inhibition influence is observed for CH4 hydrate at 10 wt% with ΔŦ of 1.52 K. The inhibition effect of TMAOH is observed to increase with increasing TMAOH concentration. Confirmed via COSMO-RS analysis, the TMAOH inhibition effect is due to its hydrogen bonding affinity for water molecules. Furthermore, the calculated hydrate dissociation enthalpies in both systems revealed that TMAOH does not participate in the hydrate crystalline structure.

KW - Ammonium based ionic liquids

KW - COSMO-RS

KW - Gas hydrate

KW - Inhibitor

KW - Phase equilibrium

KW - TMAOH

UR - https://www.scopus.com/pages/publications/85014407463

U2 - 10.1016/j.fluid.2017.02.011

DO - 10.1016/j.fluid.2017.02.011

M3 - Article

AN - SCOPUS:85014407463

SN - 0378-3812

VL - 440

SP - 1

EP - 8

JO - Fluid Phase Equilibria

JF - Fluid Phase Equilibria

ER -

Influence of tetramethylammonium hydroxide on methane and carbon dioxide gas hydrate phase equilibrium conditions

Abstract

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Keywords

ASJC Scopus subject areas

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