Abstract
A molecular-based approach for modelling mixtures adsorbed onto solid surfaces using the Statistical Associating Fluid Theory for Potentials of Variable Range (SAFT-VR) for three- and two-dimensional systems is presented in this work. The theory is used to describe the adsorption of binary mixtures of carbon dioxide, methane and nitrogen onto dry activated carbon, describing the overall adsorption phase diagram reported for these systems even at high pressures.
Highlights
The processes of adsorption and diffusion of fluids in porous media is of great interest in the chemical industry, with applications on environmental remediation being of specific concern (Patel et al 1972; Ruthven 1984; Yang 1987)
This approach has been applied to model adsorption isotherms for pure molecular fluids, such as methane, nitrogen, carbon dioxide, ethane, ethylene and propane, adsorbed onto activated carbon and silica gel (Martínez et al 2007; Jiménez et al 2008; Castro et al 2010), as well as asphaltenes adsorbed onto Berea sandstone, Bedford limestone and dolomite rock (Castro et al 2009)
We extend this study to the case of the adsorption of chain molecule fluids, following the SAFT-VR approach in 3D (Galindo et al 1998) and assuming that the monomer–monomer and monomer–wall interactions can be described via square-well potentials
Summary
The processes of adsorption and diffusion of fluids in porous media is of great interest in the chemical industry, with applications on environmental remediation being of specific concern (Patel et al 1972; Ruthven 1984; Yang 1987). We present the theory used to describe the adsorption of a mixture of fluids onto a uniform wall, assuming a 2D approximation within the SAFT-VR approach.
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