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Chapter one

Chapter one. Mole Balances. 1.3 Batch Reactor. Nor inflow neither outflow of reactants and products while reaction is being carried out Used for small scale operation Used for lab experiments Used for expensive products. Batch Reactor.

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Chapter one

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  1. Chapter one Mole Balances

  2. 1.3 Batch Reactor • Nor inflow neither outflow of reactants and products while reaction is being carried out • Used for small scale operation • Used for lab experiments • Used for expensive products

  3. Batch Reactor • for perfectly mixed reaction mixure the reaction rate is same throughout the reactor volume, Then integral equation becomes Where t is the time required to change the number of moles from Nj0 to Nj1

  4. 1.4 Continuous Flow Reactor • 1.4.1 Continuous Stirred Tank Reactor (CSTR) • Used for liquid phase reactions • Operated at steady state • Perfectly mixed (all variables are the same everywhere)

  5. The general mole balance is For steady stae For perfecly mixing The design eq. that gives the necessary volume to reduve the flow rate of species j from Fj0 to Fj

  6. 1.4.2 Tubular Reactor • Consists of cylindrical pipe • Operated at steady state • The reactants are continually consumed as they flow down the length of the reactor • Concentration varies only axially • Used for gas phase reactions

  7. The mole balance around ΔV • In - Out + Generation = Accumulation Divide by ΔV and take limit as ΔV→0

  8. For the reaction A→B • This equation is used to find the volume necessary to reduce FA0 to FA and produce FB1

  9. 1.4.3 Packed Bed Reactor • Fluid solid heterogeneous reaction takes place on the surface of the catalyst • Reaction rate (-rA’)=mol A reacted/s.g catalyst

  10. The mole balance around ΔW In - Out + Generation = Accumulation Divide by ΔW and take limit as ΔW→0

  11. For the reaction A→B • This equation is used to find the catalyst weight necessary to reduce FA0 to FA

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