Elements of Chemical Reaction ering 4th Ed - H. Scott Fogler 42

Elements of Chemical Reaction ering 4th Ed - H. Scott Fogler 42

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10 Mole Balances Chap. 1 This is a baxic equation for chemical reac~ion engineeri~ig. By taking the appropriate limits (i.e., let M + w and AV+ 0 ) and making use of the definition of an integral, we can rewrite the foregoing equation in the form From this equation we see that r, will be an indirect function of position, since the properties of the reacting materials and reaction conditions (e.g., concen- tration. temperature) can have different values at different locations in the reac- tor. We now replace G, in Equation (1-3) hy its integral form to y~eld a form of the general inole balance equation for any chemical species j that is entering, leaving, reacting. andlor accumulating within any system voluine 1! From this general mole balance equation we can develop the design equations for the various types of industrial reactors: batch, semibatch. and continu- ous-flow. Upon evaluation of these equarions
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Unformatted text preview: we can determine the time (batch) or reaclor volume (cominuous-flow) necessary to convert a specified amount of the reactants into products. f .3 Batch Reactors is a hatch A hatch reactor is used for small-scale operation. for testing new procesces that reactor u\rriq have not been fully de\elnped. for the manufacture of expensive products. and for processes that are difficult 10 conImen to continuous operations. The reactor can he charged (i.e., filled) through the holes at the top (Figure 1 -S[al). The / @\ batch reactor has the advantngc of high convercions that can be obtained by \ leaving the reactant in the reactor for long periods of time. but it also has the disadvantages of high labor costs-per batch, the vxiabiliry of products from Reference Shelf batch to batch. and the difficulty of large-scale production (see Profecsional Reference Shelf [PRS])....
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This note was uploaded on 07/05/2010 for the course CHEM 204 taught by Professor Vanderwal,c during the Spring '08 term at UC Irvine.

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