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mass transfer mechanisms in fixed-bed adsorption of erythromycin

Frontiers of Chemical Science and Engineering 2008年第4期2卷 353-360页

作者： Ying SUN Jiawen ZHU Kui CHEN Sheng ZHU Jie XU Chemical Engineering Research Centre East China University of Science and TechnologyShanghai 200237China

The equilibrium and kinetic characteristics of the adsorption of erythromycin to Sepabeads SP825 were *** equilibrium data in a batch system was well described by a Langmuir *** separation performance was investigated in a fixed-bed system with respect to the adsorption superficial velocity,ionic strength and ph.A mathematical model was used to simulate the mass transfer mechanism,taking film mass transfer,pore diffusion and axial dispersion into *** model predictions were consistent with the experi-mental data and were consequently used to determine the mass transfer coefficients.

关键词： fixed-bed adsorption superficial velocity ionic strength erythromycin However investigations on the parameters governing the performance of this technology are still scarce.In the present work a polymeric and porous resin Sepabeads SP825 resin was used for its higher adsorption efficiency compared with the resins reported.The equilib-rium capacity of Sepabeads SP825 for EM in a batch system was established using a Langmuir isotherm.The effects of superficial velocity ionic strength and ph on the adsorption process were determined from the results of fixed bed experiments.and a model of the purification process was used to simulate the mass transfer mechanism which has taken film mass transfer pore diffusion and axial dispersion into account.The experimental adsorp-tion measurements were compared to the results calcu-lated from the model.The completion of these studies provide some essential parameters which are required in order to design a successful purification process and better understand the fundamentals of these process.

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