Dispersion reactor

Analytical solutions also are possible when T is constant and m = 0, V2, or 2. More complex chemical rate equations will require numerical solutions. Such rate equations are apphed to the sizing of plug flow, CSTR, and dispersion reactor models by Ramachandran and Chaud-hari (Three-Pha.se Chemical Reactors, Gordon and Breach, 1983). 

Equation 8-155 shows that the conversion in the dispersion reactor will always be less than that of the plug flow reactor (C >... 

Figure 1. Key elements of the TAP reactor (A) and high pressure fixed bed reactor (B) experimental systems. The TAP reactor schematic shows the heated valve manifold and reactor with the elevated pressure attachment located in the main high vacuum chamber. The fixed bed reactor shows the feed system, liquid vaporizer, oxygen disperser, reactor, and waste recovery system.

They determined the ratio of the dispersion reactor volume to the plug flow reactor volume necessary to accomplish the same degree of conversion for several values of the dimensionless dispersion parameter S)l/uL. Figure 11.10 summarizes their results. It is evident that for high... 

Solutions with other chemical rate equations are in P8.03.03, and some numerical cases in P8.03.04-P8.03.06. Such rate equations can be applied to the sizing of plug flow, CSTR and dispersion reactor models. 

Dispersion reactor Partial differential equations (unsteady state and steady state)... 

The dimensionless group Del/uL is known as the dispersion number and is the parameter that measures the extent of axial dispersion. The degree to which axial dispersion influences the performance of a chemical reactor is determined by the value of the Peclet number (NPe). A high value of NPe corresponds to a slightly dispersed reactor. That is,... 

Equation 8-155 shows that the conversion in the dispersion reactor will always be less than that of the plug flow reactor (CA dispersion > Ca,plug flow)- In the case where the effluent composition is fixed instead of die reactor size, Equations 8-152 and 8-154 can be manipulated to show that for small Del/uL,... 

In liquid ejectors or aspirators, the liquid is the motive fluid, so the gas pressure drop is low. Flow of slurries in the nozzle may be erosive. Otherwise, the design is as simple as that of the venturi. Kohl and Riesenfeld (Gas Purification, Gulf, 1985, pp. 268-288) describe the application of liquid dispersion reactors to the absorption of fluorine gases. 

When a fluid passes through a packed column, the flow is divided due to the packing. Modelling of these phenomena is carried out by superimposing a dispersion, characterized by a coefficient D on the convective plug flow of velocity U. This is the model for an axial dispersion reactor. This model allows characterisation of a flow with intermediate properties between those of the plug flow reactor and those of a continuous stirred reactor. 

The response of the axially dispersed reactor to an imperfect pulse can also be obtained, using the convolution integral, as... 

The application of liquid dispersion reactors to the absorption of fluorine gases is described by Kohl and Riesenfeld Gas Purification, Gulf, 1985, pp. 268-288). 

A plot of E 6) versus 0 is shown in Figure 8.4.2 for various amounts of dispersion. Notice that as Pea oo (no dispersion), the behavior is that of a PER while as PCa- Q (maximum dispersion), it is that of a CSTR. Thus, the axially-dispersed reactor can simulate all types of behaviors between the ideal limits of no back-mixing (PFR) and complete backmixing (CSTR). 

Grade Commercial, technical, brick, amalgam, coated powders, dispersions (sodium dispersion), reactor (99.99% pure). 

Figure 5.16 Different inlet/outlet configurations with corresponding boundary conditions for the one-dimensional dispersion reactor model.

Three sets of conditions have been employed in most work dealing with onedimensional dispersion reactor models. These are... 

Develop a computational procedure for the solution of the nonisothermal, onedimensional axial dispersion reactor model. 

Table 4.3 Correlations of different model parameters, determined under steady-state-operation conditions for the used extended axial dispersion reactor model.

Fig. 7.5 Bioreactors used for cultivation of hairy root cultures of different Solanaceae plants 1 stirred tank with isolated stirrer 2 bubble column 3 airlift with modified draft tube 4 temporary immersion RITA system 5 liquid-dispersed trickle reactor 6 convective flow reactor 7 modified liquid-dispersed reactor 8 trickle-bed reactor cuid 9 droplet reactor...

McKelvey SA, Gehrig JA, Hollar KA, Curtis WR (1993) Growth of plant root cultures in liquid- and gas-dispersed reactor environments. Biotechnol Prog 9(3) 317-322... 

Wei F, Wan XT, Hu YQ, Wang ZG, Yang YH, Jin Y. A pilot plant study and 2-D dispersion-reactor model for a high-density riser reactor. Chem Eng Sci, in press, 2000b. 

Assuming a height of 10 m for the axial dispersed reactor a Bodenstein number can be estimated... 

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