LFR Performance in Relation to SFM

the material balance for an LFR and die SFM applied to an LFR give die same result This is because LF, like PF, is, indeed, segregated flow. The SFM is exact for an LFR for any kinetics, just as it is for a PFR 

16-1 For a second-order reaction (A - products) occurring in an LFR, show that the fiactional conversion of A is given by  

16-3 Determine the fractional conversion /A of A for a zero-order reaction (A - products) in a laminar flow reactor, where c o = 0.25 mol L 1, jfcA = 0.0015 mol L-1 s-1, and t = 150 s. Compare the result with the fractional conversion for a PFR and for a CSTR 16-4 Using equation 16.2-18, develop a graph which shows the fractional conversion /A as a function of the dimensionless reaction number MAo for a zero-order reaction, where Mao = kt/cAo equation 4.3-4. what are the real limits on Mao ( e values f°r which reasonable values of /A are obtained) Explain. 

16-5 Develop the E(t) profile for a 10-m laminar-flow reactor which has a maximum flow velocity of 0.40 m min-1. Consider t = 0.5 to 80 min. Compare the resulting profile with that for a reactor system consisting of a CSTR followed by a PFR in series, where the CSTR has the same mean residence time as the LFR and the PFR has a residence time of 25 min. Include in the comparison a plot of the two profiles on the same graph. 

We focus attention in this chapter on simple, isothermal reacting systems, and on the four types BR, CSTR, PFR, and LFR for single-vessel comparisons, and on CSTR and PFR models for multiple-vessel configurations in flow systems. We use residence-time-distribution (RTD) analysis in some of the multiple-vessel situations, to illustrate some aspects of both performance and mixing. 

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