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External mass transfer and intraparticle diffusion limitations

4 EXTERNAL MASS TRANSFER AND INTRAPARTICLE DIFFUSION LIMITATIONS [Pg.437]

In a catalytic reactor, the fluid flows through the catalyst particles and may face a resistance caused by the concentration gradient between the bulk fluid and the external particle surface. This resistance (interparticle or external mass transfer limitation) must be added to intraparticle diffusion limitation. [Pg.437]

The external concentration Cao is known (it is the bulk concentration), but a concentration gradient ranging from Ca to Cas may exist within the thin film around the particle, Cas being concentration at the external surface of the particle or at the [Pg.437]

Curve n shows a lower concentration gradient outside the particle, compared to curve 1, but followed by a concentration gradient inside the pore due to the intraparticle diffusion limitation. On the other hand, curve III does not have influence of external limitations, representing the reaction rate in the presence of pore-diffusion resistance as shown in the following equation  [Pg.438]

The effectiveness factor depends on the Thiele modulus defined by Equation 18.13. [Pg.438]


Defining a new factor that comprises both external mass transfer and intraparticle diffusion limitations (Fogler, 2000) ... [Pg.439]




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Diffusion limit

Diffusion limitation

Diffusion limiting

Diffusion mass transfer

Diffusive limit

Diffusive transfer

External diffusion

External mass transfer

External mass transfer limitations

External transfer

Intraparticle

Intraparticle diffusion

Intraparticle diffusivity

Intraparticle mass transfer

Limiting diffusivity

Mass diffusion

Mass diffusivities

Mass diffusivity

Mass limit

Mass limitation

Mass transfer diffusive

Mass transfer diffusivity

Mass transfer limitation

Mass transfer limits

Transfers, limits

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