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LDF based parametric optimization to model fluidized bed adsorption of trichloroethylene on activated carbon particles

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Particuology 2022年第6期20卷 72-92页

作者： Shradha Nikam Debapriya Mandal Prasad Dabhade Homi Bhabha National Institute Mumbai 400094India Alkali Material and Metal Division Bhabha Atomic Research CentreMumbai 400085India

Trichloroethylene(TCE)is largely used in industries as a cleaning and degreasing solvent.TCE is a potential carcinogen and is known to cause organ damage when exposed to prolonged higher concentrations.Numerical simulation of fixed and fluidized bed adsorption of TCE can help in the development of efficient adsorption processes to prevent industrial workers in the vicinity from acute TCE exposure.In the present work,a parametric optimization based numerical experimentation algorithm is implemented by open-source computational solvers to model fixed and fluidized bed adsorption of trichloroethylene vapors on activated carbon.The algorithm optimizes four parameters pertaining to linear driving force(LDF)formulation of surface barrier and microporous diffusion.The optimized parameters were utilized to evaluateζ,a dimensionless number defined as the temporal and spatial average ratio of surface barrier diffusion resistance to microporous diffusion resistance.The average value ofζis 0.139 for fixed bed operation(u/u_(mf)=0.7),1.130 for fluidized bed operation(u/u_(mf)=1),4.436 for fluidized bed operation(u/u_(mf)=1.5)and 6.317 for fluidized bed operation(u/u_(mf)=2).Therefore,the dimensionless numberζmay serve to predict the extent of change in amount adsorbed per unit adsorbent mass with change in fluidization velocity.

关键词： Fluidization Adsorption linear driving force Parameter optimization Trichloroethylene Activated carbon

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A model for transient diffusion in bidisperse pore structures

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Petroleum Science 2019年第6期16卷 1455-1470页

作者： Wei Sun Sheng-Li Chen Ming-Ri Xu Ya-Qian Wei Ting-Ting Fan Bao-Li Ma Jin-Tao Guo State Key Laboratory of Heavy Oil Processing and Department of Chemical Engineering China University of PetroleumChangpingBeijing 102249People’s Republic of China Daqing Petrochemical Research Center CNPCDaqing 163741HeilongjiangChina

A bidisperse model for transient diffusion and adsorption processes in porous materials is presented in this paper.The mathematical model is solved by numerical methods based on finite elements combined with the linear driving force approximation.A criterion based on the model to identify the diffusion controlling mechanism(macropore diffusion,micropore diffusion,or both)is proposed.The effects of different adsorption isotherms(linear,Freundlich,or Langmuir)on the concentration profiles and on curves of fractional uptake versus time are investigated.In addition,the influences of model parameters concerning the pore networks on the fractional uptake are studied as well.

关键词： Transient diffusion Adsorption Bidisperse pores Macropore Micropore linear driving force

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