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Mass transfer coefficient

About: Mass transfer coefficient is a research topic. Over the lifetime, 7827 publications have been published within this topic receiving 168354 citations.


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TL;DR: In this paper, the experimental results of a previous study of the mass transfer kinetics of bovine serum albumin (BSA) in ion-exchange chromatography under nonlinear conditions are reevaluated.
Abstract: The experimental results of a previous study of the mass transfer kinetics of bovine serum albumin (BSA) in ion-exchange chromatography under nonlinear conditions are reevaluated. The analysis of the concentration dependence of the lumped mass-transfer rate coefficient (k{sub m,L}) provides information on the kinetics of axial dispersion, fluid-to-particle mass transfer, intraparticle mass transfer, and adsorption/desorption. The new analysis shows that the contribution of intraparticle mass transfer is the dominant one. Similar to k{sub m,L}, the surface diffusivity (D{sub s}) of BSA increases with increasing concentration. The linear concentration dependence of k{sub m,L} seems to originate in a similar dependence of D{sub s}. The use of a heterogeneous-surface model for the anion-exchange resin provides an explanation of the positive concentration dependence of D{sub s}. This work illustrates how frontal analysis data can be used for a detailed investigation of the kinetics of mass transfer between the phases of a chromatographic column, in addition to its conventional use in the determination of the thermodynamic characteristics of the phase equilibrium.

52 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of antifoam and scale-up on operation of bioreactors were experimentally investigated using two external loop air-lure reactors.
Abstract: Effects of antifoam and scale-up on operation of bioreactors were experimentally investigated using two external loop airlift reactors. The volumes of the small and large reactors were 55 and 700 l, respectively. The addition of minute quantities of silicone-based antifoam lead to reduction in both hydrodynamic and mass transfer characteristics of all reactors. New simple empirical correlations were found for the reactors design parameters: gas hold-up, liquid circulation velocity and volumetric mass transfer coefficient. No discernible relation of antifoam concentration with scale-up of airlift reactors was found for all the design parameters.

52 citations

Journal ArticleDOI
TL;DR: In this article, the authors derived expressions for entropy generation due to heat and mass transfer processes in a multi-component fluid and showed that the entropy contribution is zero unless the thermal diffusion and diffusion-thenno effects are explicitly included in the theory.

52 citations

Journal ArticleDOI
TL;DR: In this paper, a parametric study of carbon dioxide (CO 2 ) absorption performance into an aqueous solution of monoethanolamine (MEA) in the spray column was carried out experimentally over wide ranges of process conditions.

52 citations

Journal ArticleDOI
TL;DR: In this paper, mass transfer studies were done to evaluate the rate-limiting step in the adsorption of phenol from aqueous solution onto Lantana camara.
Abstract: Adsorption is one of the important treatment methods for the removal of pollutants from wastewater. The determination of rate controlling step in the process is important in the design of the process. Therefore, in the present work, mass transfer studies were done to evaluate the rate-limiting step in the adsorption of phenol from aqueous solution onto Lantana camara. Different mass transfer models were used to find the rate-limiting step and also to find the values of external mass transfer coefficient and diffusion coefficient. The Biot number was found to investigate the importance of external mass transfer to intraparticle diffusion. From the various models studied and the Biot numbers obtained, it was found that the adsorption on Lantana camara was controlled by film diffusion. The sensitivity analysis was performed to study the significance of the model parameters on the adsorption process.

52 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023110
2022240
2021245
2020205
2019207
2018252