New insights in the velocity dependency of the external mass transfer coefficient in 2D and 3D porous media for liquid chromatography

2012 ◽  
Vol 1227 ◽  
pp. 194-202 ◽  
Author(s):  
Sander Deridder ◽  
Gert Desmet
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Liquid Chromatography ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
External Mass Transfer ◽  
2D And 3D

scholarly journals Studies of the Dimensionless Mass-transfer Coefficient During the Adsorption of Basic and Acid Dyes on to Bagasse Pith

1994 ◽  
Vol 11 (2) ◽  
pp. 73-81 ◽  
Author(s):  
Mamdouh M. Nassar ◽  
Mohammed S. El-Geundi
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Particle Diameter ◽  
External Mass Transfer ◽  
Acid Dyes ◽  
Dimensionless Function ◽  
Bagasse Pith ◽  
System Variables

The influence of agitation, particle diameter and mass of adsorbent on the external mass-transfer coefficient is discussed. The computed values correlate with the dimensionless function Sh/Sc1/3. It has been found that Sh/Sc1/3 varies linearly with the variables studied and may be correlated with system variables via the equation Sh/Sc1/3 = A(variable)B.

scholarly journals Dynamic studies of nitrophenols sorption on perfil in a fixed-bed column

2008 ◽  
Vol 27 (2) ◽  
pp. 123 ◽  
Author(s):  
Zvezdelina Yaneva ◽  
Mirko Marinkovski ◽  
Liljana Markovska ◽  
Vera Meshko ◽  
Bogdana Koumanova
Keyword(s):  
Mass Transfer ◽  
Diffusion Coefficient ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Dispersion Coefficient ◽  
Fixed Bed ◽  
External Mass Transfer ◽  
Fixed Bed Column ◽  
Axial Dispersion Coefficient ◽  
Solid Diffusion

The adsorption of two substituted nitrophenols, namely 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP), from aqueous solutions onto perfil was studied using a fixed bed column. The theoretical solid diffusion control (SDC) model describing single solute adsorption in a fixed bed based on the Linear Driving Force (LDF) kinetic model was successfully applied to the investigated systems. The model parameters of solid diffusion coefficient, DS, axial dispersion coefficient, DL, and external mass transfer coefficient, kf, for the investigated systems were estimated by the means of a best fit approach. Some deviations were found between the predicted and the experimental data which reflect the fact that the assumptions of the model were not quite fulfilled for these experiments. It is necessary to adjust the values of the solid diffusion coefficient, the axial dispersion coefficient and the external mass transfer coefficient in order to obtain a satisfactory agreement between the simulated and the experimental breakthrough curves. A Biot number was used as an indicator for the intarparticle diffusion. The Biot number was found to decrease with the increase of bed depth, indicating that the film resistance increased or the intraparticle diffusion resistance decreased.

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