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Isothermal reactors single

The general rule is that combinations of isothermal reactors provide intermediate levels of performance compared with single reactors that have the same total volume and flow rate. The second general rule is that a single, piston flow reactor will give higher conversion and better selectivity than a CSTR. Autocatalytic reactions provide the exception to both these statements. [Pg.135]

This chapter deals with the design of reactors which do not conform to these ideal models its attention is restricted to constant volume, single phase, isothermal reactors which are operated in the steady state. It is not intended to be a state of the art review of non-ideal reactor design methods, but rather an introduction to basic ideas and techniques frequently, the reader will be referred to more extended or specific coverage of the material being considered. [Pg.223]

When we can predict the response of the reacting system to changes in operating conditions (how rates and equilibrium conversion change with temperature and pressure), when we are able to compare yields for alternative designs (adiabatic versus isothermal operations, single versus multiple reactor units, flow versus batch system), and when we can estimate the economics of these various alternatives, then and only then will we feel sure that we can arrive at the design well fitted for the purpose at hand. Unfortunately, real situations are rarely simple. [Pg.85]

The chemical engineer almost never encounters a single reaction in an ideal single-phase isothermal reactor. Real reactors are extremely complex with multiple reactions, multiple phases, and intricate flow patterns within the reactor and in inlet and outlet streams. An engineer needs enough information from this course to understand the basic concepts of reactions, flow, and heat management and how these interact so that she or he can begin to assemble simple analytical or intuitive models of the process. [Pg.6]

Single Reactions in Continuous Isothermal Reactors TABLE 3-5... [Pg.128]

We have now developed the basic ideas of continuous chemical reactors, and we have solved these equations for a single reaction in an isothermal reactor. Given r Cj), we solve the equations... [Pg.134]

For a single reaction in an isothermal reactor the design principles involved primarily the reactor configuration for niinimum residence time. This generally favors the PFTR over the CSTR for positive-order kinetics. However, the CSTR frequently is less costly and easier to maintain, and one or more CSTRs can frequently be preferred over a PFTR. [Pg.195]

In the previous chapter we showed how nonisothermal reactors can exhibit much more complex behavior than isothermal reactors. This occurs basically because k(T) is strongly temperature dependent Only a single steacfy state is possible in the PFTR, but the CSTR, although (or because) it is described by algebraic equations, can exhibit even more interesting (and potentially even more dangerous) behavior. [Pg.245]

The reforming process model is designed to predict the performance of many reactor configurations. The model can be run in four modes, combining adiabatic or isothermal reactors with recycle or single-pass (no recycle)... [Pg.240]

In order to lighten the calculations, a simplified loop is taken into account, in which dehydration of H2S04 into S03 + H20 is performed in a single isotherm reactor (without catalyst), whereas dissociation of S03 into S02 + V2 02 is performed in another single isotherm reactor (with catalyst), at a higher temperature called Tmax. Only this last temperature is varied in the sensitivity analysis. [Pg.186]

Catalyst deactivation was first identified as a percolation-type process by Sahimi and Tsotsis (2,3,41). The process studied by these authors was relatively simple. A porous catalyst, inside a differential isothermal reactor (with the catalytic active material uniformly distributed in its pores at an initial concentration CQ) is reacting while simultaneously undergoing slow deactivation. The overall reaction rate r in a single pore of radius R and length L is given by... [Pg.172]

Irrespective of the catalyst type used, the high initial carbon monoxide concentrations mean that the reaction must generally be performed in steps, with intermediate cooling. But it has also been reported that the CO content can be reduced from 50 to 0.8 % in a single step in a large hydrogen plant by using a quasi-isothermal reactor (e.g., the Linde spiral-wound reactor). [Pg.121]

A single, isothermal reactor design more reliably yields gypsum crystals than multiple-reactor designs with poorer temperature control [39]. This benefit has also been claimed for a two-vessel loop system. The effect of surfactants on crystallization of phosphogypsum has been examined [40]. Higher reactor circulation rates and increased agitation coupled with other refinements also improve acid recovery [41]. [Pg.306]


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See also in sourсe #XX -- [ Pg.157 ]

See also in sourсe #XX -- [ Pg.152 , Pg.153 , Pg.154 ]




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