Isothermal Operations with Multiple Reactions

When more than one chemical reaction takes place in the reactor, we have to address several issues before we start the design procedure. We have to determine how many independent reactions take place in the reactor and select a set of independent reactions for the design formulation. Next, we have to identify all the reactions that actually take place (including the dependent reactions) and express their rates. To determine the reactor compositions and all other state quantities, we have to write Eq. 6.1.1 for each of the independent chemical reactions. To solve the design 

Identify aU the chemical reactions that take place in the reactor and define the stoichiometric coefficients of each species in each reaction. 

Select a set of independent reactions from among the reactions whose rate expressions are given. 

For each dependent reaction, determine its multipliers with each independent reaction, using Eq. 2.4.9. 

Select a reference state [determine (iVtot)o To, Co, Vro] and the initial species compositions, j (0) s. 

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In the remainder of the chapter, we discuss how to apply the design equations and the energy balance equations to determine various quantities related to the operations of CSTRs. In Section 8.2 we examine isothermal operations with single reactions to illustrate how the rate expressions are incorporated into the design equation and how rate expressions are determined. In Section 8.3, we expand the analysis to isothermal operations with multiple reactions. In Section... 

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