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Intraparticle forced convection

Large pore catalysts or supports are used in selective oxidations and enzyme immobilization.The effect of intraparticle forced convection should be addressed from two aspects ... [Pg.7]

Moreover a detailed account of the importance of intraparticle forced convection when measuring effective diffusivities and designing reactors has been presented.This includes the analysis of non-isothermal catalysts and simulation and operation of a fixed bed catalytic reactor. [Pg.31]

Nir,A. and L.Pismen.Simultaneous Intraparticle Forced Convection,Diffusion and Reaction in a Porous Catalyst.Chem.Eng. [Pg.34]

Rodrigues,A.,Ahn,B. and A.Zoulalian.Intraparticle Forced Convection Effect in Catalyst Diffusivity Measurements and Reactor Design. klChEJ 28(1982)541-546... [Pg.34]

The water is transported from the intraparticle phase to the interstitial gas phase. It is then further transported through the porous system of the bed towards the bed surface by means of forced convection. [Pg.134]

The pyrolysis gas (VOC, tar, etc) evolved in the intraparticle phase enters the interstitial gas phase (see Figure 42) from which it is transported by forced convection to the bed surface and out to the over-bed section. The pyrolysis gases are burnt in the... [Pg.134]

Considering the intraparticle, the convective and the diffusive mass transport mechanisms in the pores of the particles as separate mass transport mechanisms, each one characterized by its own individual and proper driving force, rather than as a convective flux augmented of a diffusive flux in the pores of the particles... [Pg.323]

Intraparticle convection can also occur in packed beds when the adsorbent particles have very large and well-connected pores. Although, in general, bulk flow through the pores of the adsorbent particles is only a small frac tion of the total flow, intraparticle convection can affec t the transport of veiy slowly diffusing species such as macromolecules. The driving force for convec tion, in this case, is the... [Pg.1510]

The classic Thiele-Damkohler theory accounts for these effects, but is restricted to isothermal behavior and intraparticle mass transfer only by diffusion. If the reaction is highly exothermic and the particle is a poor heat conductor, the temperature in the particle center may rise above that in the contacting fluid and cause the overall rate to be higher than in the absence of heat- and mass-transfer limitations. Moreover, gas-phase reactions with change in mole number cause forced inward or outward convection that assists or counteracts reactant penetration into the particle and so enhances or depresses the rate. [Pg.305]


See other pages where Intraparticle forced convection is mentioned: [Pg.188]    [Pg.188]    [Pg.994]    [Pg.7]    [Pg.188]    [Pg.188]    [Pg.994]    [Pg.7]    [Pg.19]    [Pg.1814]    [Pg.1806]   
See also in sourсe #XX -- [ Pg.7 ]




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