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  1. A mole balance on species j, which enters, leaves, reacts, and accumulates in a system volume V, is

    Fj0Fj+VrjdV=dNjdt(S1-1)

    If and only if the contents of the reactor are well mixed will the mole balance (Equation (Sl-1)) on species A give

    FA0FA+rAV=dNAdt(S1-2)

  2. The kinetic rate law for rj is

    • The rate of formation of species j per unit volume (e.g., mol/s-dm3)

    • Solely a function of the properties of reacting materials and reaction conditions (e.g., concentration [activities], temperature, pressure, catalyst, or solvent [if any]) and does not depend on reactor type

    • An intensive quantity (i.e., it does not depend on the total amount)

    • An algebraic equation, not a differential equation (e.g., −rA = kCA or −rA = kCA2)

    For homogeneous catalytic systems, typical units −rj may be gram moles per second per liter; for heterogeneous systems, typical units of rj may be gram moles per second per gram of catalyst. By convention, −rA is the rate of disappearance of species A and rA is the rate of formation of species A.

  3. Mole balances on species A in four common reactors are shown in Table Sl-1.

TABLE Sl-1 SUMMARY OF REACTOR MOLE BALANCES

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