Abstract: Three adsorption rate models are derived for multicomponent adsorption systems under either
pore diffusion or surface diffusion control. The linear driving force (LDF) model is
obtained by assuming a parabolic intraparticle concentration profile. Models I and Ⅱ are
obtained from the parabolic concentration layer approximation. Examples are presented to
demonstrate the usage and accuracy of these models. It is shown that Model I is suitable
for batch adsorption calculations and Model Ⅱ provides a good approximation in fixed-bed
adsorption processes while the LDF model should not be used in batch adsorption and may be
considered acceptable in fixed-bed adsorption where the parameter Ti is relatively large.

Key words: adsorption rate, adsorption model, multicomponent adsorption

摘要： Three adsorption rate models are derived for multicomponent adsorption systems under either
pore diffusion or surface diffusion control. The linear driving force (LDF) model is
obtained by assuming a parabolic intraparticle concentration profile. Models I and Ⅱ are
obtained from the parabolic concentration layer approximation. Examples are presented to
demonstrate the usage and accuracy of these models. It is shown that Model I is suitable
for batch adsorption calculations and Model Ⅱ provides a good approximation in fixed-bed
adsorption processes while the LDF model should not be used in batch adsorption and may be
considered acceptable in fixed-bed adsorption where the parameter Ti is relatively large.

关键词: 吸附率;多组分吸附系统;吸附模式;相位传输平衡