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Comment Separation Processes

Adsorption

By Chemical Engineering |

Successful adsorber design requires information about certain adsorbent properties, including: adsorbent densities and void fractions; isotherms or other equilibrium data; and data on mass-transfer kinetics and fixed-bed dynamics. Here, these adsorbent properties are explained, along with corresponding equations. Densities and void Fractions Three densities are relevant: bulk, particle and solid. There are four pertinent void fractions, three corresponding to the three densities, and one representing the overall void fraction in the bed of adsorbent (e). These terms are related in the following way: (1) Bulk density is the mass of adsorbent in a given volume. Particle density is the mass of adsorbent per volume occupied by the particle. Solid density is the mass of the adsorbent per volume occupied by the particle, but with the pores’ volume deducted. Equilibrium Data Adsorption-equilibrium data are usually gathered at a fixed temperature and plotted or tabulated as isotherms: adsorbent capacity (loading) versus fluid-phase concentration (or partial pressure, for gases and vapors). Below are three equilibrium equations for isotherm data. Henry’s Law: (2) Langmuir Isotherm: (3) Freundlich Isotherm: (4) Henry’s…
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