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research-article

Equilibrium and kinetic of water vapor adsorption on shale

[+] Author and Article Information
Shuo Duan

School of Mining and Geomatics, Hebei University of Engineering, Handan 056038, People's Republic of China
duans10@sina.com

Guodong Li

School of Mining and Geomatics, Hebei University of Engineering, Handan 056038, People's Republic of China
344073216@qq.com

1Corresponding author.

ASME doi:10.1115/1.4040530 History: Received January 25, 2018; Revised May 24, 2018

Abstract

Water vapor adsorption and desorption isotherms and kinetics studies on three Sichuan Basin shale samples, were performed at 298 K by an accurate gravimetric method. The adsorption equilibrium data were fitted using both Dent model and Modified Dent model to estimate the adsorption characteristic of water on the primary and secondary sites. The primary site adsorption restricted to a monolayer while the secondary site adsorption are associated with multilayer sorption. A positive correlation was found between clay mineral content and monolayer sorption content. The isosteric heats of sorption of water were determined from the equilibrium data and they decreased with the increase of adsorption amount. The adsorption/desorption hysteresis were studied with the pore structure. The kinetics of water vapor adsorption was studied with the unipore model and linear driving force mass transfer (LDF) model. The effective diffusivity and kinetic rate constant varied with the increase of relative pressure, which suggested diffusion of water vapor on shale correspond to a combination of adsorption on primary sites, adsorption on secondary sites, formation of water clusters and capillary condensation.

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