TY - JOUR

T1 - Partial pressure of water vapor over gas hydrate

AU - Smirnov, Vyacheslav G.

AU - Manakov, Andrey Yu

N1 - Vyacheslav G. Smirnov, Andrey Yu. Manakov, Partial pressure of water vapor over gas hydrate, Journal of Molecular Liquids, Volume 458, 2026, 129807, ISSN 0167-7322, https://doi.org/10.1016/j.molliq.2026.129807. The work was supported by the Russian Science Foundation, Project No. 25-23-00157, https://rscf.ru/project/25-23-00157/

PY - 2026/9/15

Y1 - 2026/9/15

N2 - The equilibrium curve for gas, liquid water/ice and hydrate is usually plotted as the pressure of hydrate-forming substance versus temperature. Equilibria in the region of gas hydrate stability are less frequently studied. In the present work, the equilibrium of gas hydrate, water vapor and hydrate-forming gas is described by means of thermodynamic modeling. For the hydrate – gas equilibrium, an equation expressing water vapor pressure over hydrate as a function of gas pressure and temperature has been obtained. This equation is true within the whole gas hydrate stability region. This equation was used to calculate the pressure of water vapor in equilibrium with methane and carbon dioxide hydrates at the constant pressure of hydrate-forming gas over a broad temperature range within the stability region. Calculation results are compared with the known results on measured water vapor concentrations in the gas phase which is in equilibrium with hydrate. With the help of this equation, an attempt is made to describe the processes of hydrate formation from water sorbed by mesoporous substances. At present, there are only few experimental data on water vapor concentrations in the gas phase in equilibrium with hydrate. The equation obtained by us can be the basis for theoretical calculations of water vapor pressure, the dew point of hydrate, and the boundary of hydrate formation from bound water.

AB - The equilibrium curve for gas, liquid water/ice and hydrate is usually plotted as the pressure of hydrate-forming substance versus temperature. Equilibria in the region of gas hydrate stability are less frequently studied. In the present work, the equilibrium of gas hydrate, water vapor and hydrate-forming gas is described by means of thermodynamic modeling. For the hydrate – gas equilibrium, an equation expressing water vapor pressure over hydrate as a function of gas pressure and temperature has been obtained. This equation is true within the whole gas hydrate stability region. This equation was used to calculate the pressure of water vapor in equilibrium with methane and carbon dioxide hydrates at the constant pressure of hydrate-forming gas over a broad temperature range within the stability region. Calculation results are compared with the known results on measured water vapor concentrations in the gas phase which is in equilibrium with hydrate. With the help of this equation, an attempt is made to describe the processes of hydrate formation from water sorbed by mesoporous substances. At present, there are only few experimental data on water vapor concentrations in the gas phase in equilibrium with hydrate. The equation obtained by us can be the basis for theoretical calculations of water vapor pressure, the dew point of hydrate, and the boundary of hydrate formation from bound water.

KW - Carbon dioxide

KW - Gas hydrate

KW - Methane

KW - Phase equilibrium

KW - Sorbed water

KW - Water vapor

KW - газогидрат

KW - водяной пар

KW - сорбированная вода

KW - фазовое равновесие

KW - метан

KW - диоксид углерода

UR - https://www.mendeley.com/catalogue/d8bc61d1-a233-3e9b-9dda-5c37bf667679/

UR - https://www.scopus.com/pages/publications/105044833326

U2 - 10.1016/j.molliq.2026.129807

DO - 10.1016/j.molliq.2026.129807

M3 - Article

VL - 458

JO - Journal of Molecular Liquids

JF - Journal of Molecular Liquids

SN - 0167-7322

M1 - 129807

ER -