Page 139 - Elements of Chemical Reaction Engineering 3rd Edition
P. 139

Chap. 3   Summary                                              111

                                                         SUMMARY

                                    1. Reaction order is determined from experim.enta1 observation:

                                                            A+B ---+C                       (S3-1)




                                      The reaction in Equation  (S3-1) is a order with respect to  species A
                                      and  p order  with  respect  to  species  B,  whereas  the  overall  order  is
                                      a + p. Reaction order is determined from experimental observation. If
                                      ci = 1 and  p = 2, we  would  say  that  the  reaction  is  first-order with
                                      respect  to A, second-order with respect to IB, and overall third-order.
                                    2. In addition to the reaction order, the following terms were defined:
                                      a, Elementary reaction
                                      b.  Reversible and irreversible reactions
                                      c. Homogeneous and heterogeneous reactions
                                    3. The temperature dependence of  a specific reaction rate is given by the
                                      Arrhenius equation,

                                                               k  = Ae-wRT                   (213-2)
                                       where A  is the frequency factor and E the activation energy.
                                    4.. The stoichiometric table for the reaction

                                                            b           C     d
                                                       A+ - B ------+ -C+-D                  (S2-2)
                                                            a           a     a
                                       being carried out in a flow system is:


                                                                             ~
                                          Species   Entering   Change         Leaving
                                            A        FAO     -FAOX        FAO(1  - x)
                                                                          FAO  (..$
                                            B        FBO     - 1) FAOX
                                                               [:)
                                            C        Fco          FAOX       (0" +  .)

                                                                          FAO  (@D  +  .)
                                            DI       FDO  1) FAOX

                                                     60
                                             I       -          -              FIO
                                                     Fro                  F= F,  + 6FA0X
                                                                              d
                                                                                c
                                                                   where   6  = a+;-;-'  b
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