Elements of Chemical Reaction ering 4th Ed - H. Scott Fogler 44

Elements of Chemical Reaction ering 4th Ed - H. Scott Fogler 44

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Unformatted text preview: Mole Balances Chae. 1 0 ti t 0 1 ' Figure 1-6 M ole-time rrajectories. We might ask what time. t , , is necessary to reduce t he initial number of moles f rom N Ao to a final desired number N A I .Applying Equation ( 1-5) to t he isomerization rearranging. and integrating with limits that at r = 0. then N , = N,, NA = we obtain and at t = I , , then This equation is the integral form of the mole balance on a batch reactor. I t gives the time, r ,. necessary to reduce the number o f moles from /VAoto N ,, and also to form rYB1moles of B . 1.4 Continuous-Flow Reactors Continuous flow reactors are almost always operated at steady state. We wiil consider three types: the continuous stirred tank reactor (CSTR), the plug flow reactor (PFR), and the packed bed reactor (PBR). Detailed descriptions of these reactors can be found i n both the Professional Reference Shelf IPRS) for Chapter 1 and in the Visrral Encyciopeclin of Equiprnenr on the CD-ROM, 1.4-1 Continuous-Stirred Tank Reactor What i s a CSTR uxd A type of reactor used commonly in industrial processing is the stirred tank operated c ontinuously (Figure 1-7). It is referred to as the continuo~u-stirred tnrlk renrtor (CSTR) r vat, or backmix reactor; and i s used primarily for liquid o ...
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