A New Simplified Local Density Model for Adsorption of Pure Gases and Binary Mixtures

• Published in: International journal of thermophysics Vol. 31; no. 11-12; pp. 2425 - 2439
• Main Authors: Hasanzadeh, M., Dehghani, M. R., Feyzi, F., Behzadi, B.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.12.2010
• Subjects: Adsorption; Binary mixtures; Carbon dioxide; Classical Mechanics; Condensed Matter Physics; Density; Ethane; Industrial Chemistry/Chemical Engineering; Mathematical models; Methane; Physical Chemistry; Physics; Physics and Astronomy; Simplified local density; Sutherland potential function; Adsorption; Activated carbon; Adsorbed natural gas
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1007/s10765-010-0827-4

Adsorption modeling is an important tool for process simulation and design. Many theoretical models have been developed to describe adsorption data for pure and multicomponent gases. The simplified local density (SLD) approach is a thermodynamic model that can be used with any equation of state and offers some predictive capability with adjustable parameters for modeling of slit-shaped pores. In previous studies, the SLD model has been utilized with the Lennard–Jones potential function for modeling of fluid–solid interactions. In this article, we have focused on application of the Sutherland potential function in an SLD–Peng–Robinson model. The advantages and disadvantages of using the new potential function for adsorption of methane, ethane, carbon dioxide, nitrogen, and three binary mixtures on two types of activated carbon are illustrated. The results have been compared with previous models. It is shown that the new SLD model can correlate adsorption data for different pressures and temperatures with minimum error.