Packed-bed catalytic reactor

Whitaker, S, Local Thermal Equilibrium An Application to Packed Bed Catalytic Reactor Design, Chemical Engineering Science 41, 2029, 1986. 

Model for a Packed-Bed Catalytic Reactor with Periodic Reversal of... 

In the chemical process industries the designer will normally be concerned with the second type catalytic reactors. Industrial packed-bed catalytic reactors range in size from small tubes, a few centimetres diameter, to large diameter packed beds. Packed-bed reactors are used for gas and gas-liquid reactions. Heat-transfer rates in large diameter packed beds are poor and where high heat-transfer rates are required fluidised beds should be considered. 

Chapter 17 Heterogeneous Reactions—Introduction /369 Chapter 18 Solid Catalyzed Reactions /376 Chapter 19 The Packed Bed Catalytic Reactor /427... 

Reactant A at C o = 10 mol/m is to be passed through a packed bed catalytic reactor where it will decompose into either R or S. To maximize the formation of R and for 90% decomposition of A determine... 

Figure 7-6 Different size scales in a packed bed catalytic reactor. We must consider the position z in the bed, the flow around catalyst pellets, diffusion within pores of pellets, and adsorption and reaction on reaction sites. These span distance scales from meters to Angstroms.

Modeling of the packed bed catalytic reactor under adiabatic operation simply involves a slight modification of the boundary conditions for the catalyst and gas energy balances. A zero flux condition is needed at the outer reactor wall and can be obtained by setting the outer wall heat transfer coefficients /iws and /iwg (or corresponding Biot numbers) equal to zero. Simulations under adiabatic operation do not significantly alter any of the conclusions presented throughout this work and are often used for verification... 

For the special case of a packed bed catalytic reactor with plug flow, the equation is rewritten in terms of catalyst weight,... 

Tsotsis, A. Champagnie, A. Vasileiadis, S. Ziaka, Z. Minet, R. Packed Bed Catalytic Reactors Chemical Engineering Science 47(9) (1992) 2903-2908. 

Chapter 7, Reactor Design, discusses continuous and batch stirred-tank reactors and die packed-bed catalytic reactor, which are frequently used. Heat exchangers for stirred-tank reactors described are the simple jacket, simple jacket with a spiral baffle, simple jacket with agitation nozzles, partial pipe-coil jacket, dimple jacket, and the internal pipe coil. The amount of heat removed or added determines what jacket is selected. Other topics discussed are jacket pressure drop and mechanical considerations. Chapter 7 also describes methods for removing or adding heat in packed-bed catalytic reactors. Also considered are flow distribution methods to approach plug flow in packed beds. 

Example 7.3 Packed-Bed, Catalytic, Reactor Sizing Using Space Velocity... 

---