Monte Carlo Simulation for Distribution Behavior of Benzene between Slit Pores and Supercritical CO2 at Infinite Dilution

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Tomoshige Nitta¹  Takeshiro Shigeta¹ 

[1] Dept. of Chemical Engineering, Faculty of Engineering Science, Osaka University

关键词: Adsorption;    Supercritical Fluid;    Monte Carlo Simulation;    Chromatography;    Distribution Coefficient;   

DOI  :  10.1252/jcej.29.516

来源: Maruzen Company Ltd

【 摘 要 】

References(17)Cited-By(4)The distribution coefficients of benzene between slit pores and supercritical carbon dioxide at infinite dilution are calculated by the Monte Carlo simulation method over a wide temperature range. The Lennard-Jones potential function is used for describing interactions between benzene, CO2, and graphitic carbon. The distribution coefficient, K2, which is defined as the ratio of the concentration of benzene in a pore to that in the fluid phase, is calculated from the residual chemical potentials of benzene, μ2res, for both phases by applying Widom’s test particle insertion method. Under the condition of the constant fluid density, the logarithm of K2 increases linearly with increasing reciprocal temperature, while it shows a maximum in the constant pressure condition. We observed a remarkable difference between the influence of density on μ2res: that is, μ2res in the fluid phase gets stabilized with an increase in fluid density due to the increase of number of CO2 molecules interacting with the benzene molecule, while μ2res in the pore becomes unstable with an increase in pore-phase density after the first monolayer near the wall has been occupied by CO2 molecules. The radial distribution functions of CO2 surrounding a benzene molecule in several pores of different slitwidths are displayed in three-dimensional graphics and they indicate how the benzene molecule and the surface walls influence the microstructure of CO2 in pores.

【 授权许可】

Unknown