Bisolute Adsorption onto Activated Carbon in a Fixed Bed: IAST (Ideal Adsorbed Solution Theory) vs. SIAST (Simplified Ideal Adsorbed Theory)

摘要

Numerical modeling of adsorption onto activated carbon can be a valuable tool in activated carbon adsorber design and operation; unfortunately, current predictive models often are restricted to certain system conditions and developmental assumptions. The homogeneous surface diffusion model (HSDM) was evaluated for its sensitivity to model parameters, and for the influence of ideal adsorbed solution theory (IAST) and simplified on HSDM model prediction accuracy. Two dynamic model parameters were found to have an impact on HSDM response: the intraparticle diffusion coefficient and the film transfer coefficient. Of these two parameters, the film transfer coefficient had the most significant impact on HSDM performance; indicating that care must be taken when determining the model parameter. Additionally, HSDM utilizing IAST afforded better prediction accuracy than HSDM utilizing simplified IAST.