Single effective diffusivities for dynamic adsorption in bidisperse adsorbents

✍ Scribed by Dong Hyun Kim

• Publisher: American Institute of Chemical Engineers
• Year: 1990
• Tongue: English
• Weight: 418 KB
• Volume: 36
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690360219

✦ Synopsis

To be realistic, diffusion in bidisperse porous structures is often considered in terms of macropore diffusion and micropore diffusion. In this approach the diffusivity and the mass balance are defined separately for each pore system. Ruckenstein et al. (1971) and many investigators (Haynes and Sarma, 1973;Hashimoto and Smith, 1973;Hashimoto et al., 1976;Raghavan and Ruthven, 1985) have used this approach to analyze dynamic diffusion and adsorption in biporous adsorbents, and proposed their respective mathematical models. Nevertheless, it is not uncommon to lump both macropore and micropore diffusion together and model the internal diffusion with a single effective diffusivity as if the pore size distribution is unimodal (Eberly