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Thermodynamic Modeling Study on Phase Equilibrium of Gas Hydrate Systems for CO2 Capture

  • Ahmad Banafi
  • Mohamad Mohamadi-Baghmolaei
  • Abdollah Hajizadeh
  • Reza AzinEmail author
  • Amir Abbas Izadpanah
Article
  • 10 Downloads

Abstract

A thermodynamic model is introduced to describe equilibrium conditions of gas hydrates formed from mixtures of CO2, N2 and H2O. The model employs the van der Waals and Platteeuw (vdW–P) solid solution theory and a modified version of cubic-plus-association equation of state that uses the Peng–Robinson equation of state for physical interactions (PR–CPA) to describe hydrate and fluid phases, respectively. When not available elsewhere, the model parameters are determined as part of this work. Pure component parameters for N2 were calculated by fitting of the PR–CPA parameters to vapor pressures and saturated liquid densities. Moreover, solubility data for N2 in pure water are used to fit the binary interaction parameter for the N2–H2O system. Finally, Kihara cell potential parameters are obtained by regressing the model to the hydrate dissociation pressures of mixed hydrates. The model is validated with available experimental data in terms of equilibrium dissociation pressure and hydrate composition. Results reveal that the model is capable of describing equilibrium conditions with high accuracy. In addition to the equilibrium dissociation pressure, the model is able to predict hydrate compositions with satisfactory accuracy compared to other models, although such data were not utilized as reference data in the fitting procedure. Due to disparity amongst various data sets for the studied system, it is difficult to find unequivocally a model that perform better for all data sets. However, the introduced model shows more accurate results for most data sets and obtains satisfactory agreement in the rest. Additionally, the presented model predicts the structural transition boundary better than other similar models.

Keywords

Gas hydrates Carbon dioxide capture Thermodynamic modeling van der Waals–Platteeuw CPA 

List of Symbols

a

Attractive parameter of a cubic EoS

b

Co-volume parameter of a cubic EoS

g

Radial distribution function

kij

Binary interaction parameter

lij

Binary interaction parameter

P

Pressure

R

Universal ideal gas constant

T

Absolute temperature

v

Molar volume

Z

Compressibility factor

\(T^{\prime}_{c}\)

Rescaled critical temperature

\(P^{\prime}_{c}\)

Rescaled critical pressure

f

Fugacity of gas species

yj

The mole fraction of component j in the vapor phase

xi

The mole fraction of the component i in the liquid/vapor phase

\(X^{{A_{i} }}\)

The mole fraction of the molecule i not bonded at site A

\(w(r)_{m,j}\)

The spherical core cell potential of component j in a cavity of type m

r

The linear distance from the center of the cell

zm

The coordination number for the guest in a cavity of type m

Rm

The radius of cavity type m

Cm,j

The Langmuir coefficient of component j in a cavity of type m

kB

The Boltzmann constant

NDP

Number of data points

Yj

The composition of hydrate former j in the hydrate phase on a water-free basis

Greek symbols

\(\varepsilon^{{A_{i} B_{j} }}\)

Association energy between site A of molecule i and site B on molecule j

\(\beta^{{A_{i} B_{j} }}\)

Association volume between site A of molecule i and site B on molecule j

ω

Rescaled acentric factor

ρ

The molar density of the mixture

μ

The chemical potential

νm

The number of cavities of type m per water molecule in the unit cell

θm,j

The fractional occupancy of component j in a cavity of type m

\(\Delta^{{A_{i} B_{j} }}\)

Association strength

α

The activity of water in the non-ideal liquid phase

\(\Delta \mu \left( {T, P} \right)_{w}^{L}\)

Chemical potential difference for water between the meta-stable β-phase and liquid phase

\(\Delta \mu \left( {T_{0} , P_{0} } \right)_{w}^{\beta - L}\)

The chemical potential difference for water between the β-phase and liquid phase at reference temperature T0 and reference pressure P0

\(\Delta \mu \left( {T, P_{R} } \right)_{w}^{{L,{\text{ref}}}}\)

The chemical potential difference for water at temperature T and the dissociation pressure of the reference pressure PR

\(\Delta H\left( {T_{0} , P_{0} } \right)_{w}^{{\beta - {\text{ice}}}}\)

The differences in molar enthalpy for water between the meta-stable β-phase measured for the reference hydrate and ice

\(\Delta H\left( T \right)_{w}^{{{\text{ice}} - L}}\)

The differences in molar enthalpy for water between ice and liquid water

\(\Delta V_{w}^{{\beta - {\text{ice}}}}\)

The differences in molar volume for water between the β-phase measured for the reference hydrate and ice

\(\Delta V_{w}^{{{\text{ice}} - L}}\)

The differences in molar volume for water between ice and liquid water

\(\Delta C_{P}\)

The isobaric heat capacity difference for water from the reference temperature to the actual temperature

Superscripts

L

The liquid phase

H

The hydrate phase

V

The vapor phase

β

The meta-stable phase with the same structure of water in the hydrate as in the reference state

φj

The fugacity coefficient of component j in the vapor phase

Subscripts

c

Critical property

r

Reduced property

i

The component i

j

The component j

w

Water

0

The reference situation

Notes

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Authors and Affiliations

  1. 1.Iranian Gas Transmission CompanyBushehrIran
  2. 2.Department of Chemical Engineering, Faculty of Petroleum, Gas and Petrochemical EngineeringPersian Gulf UniversityBushehrIran
  3. 3.Department of Petroleum Engineering, Faculty of Petroleum, Gas and Petrochemical EngineeringPersian Gulf UniversityBushehrIran

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