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Recycle reactor models for complex electrochemical/chemical reaction systems

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Abstract

The performance of complex electrochemical reaction sequences in recycle plug flow reactors is mathematically modelled. The reactions include successive electron transfers (EE reactions), chemical reaction interposed between successive electron transfers (ECE reactions), simultaneous electron transfers and simultaneous electron transfer and chemical reaction. Both potentiostatic and galvanostatic operations are considered and the effects of important parameters such as mass transport coefficient, recycle ratio and chemical reaction rate in the recycle loop are highlighted. This is done by considering two important electro-organic synthesis reactions, the production ofp-aminophenol and the reduction of oxalic acid to glyoxylic acid.

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Abbreviations

a :

activity factor

C ji :

concentration of species j at reactor inlet

C j :

bulk concentration of species j

C sj :

surface concentration of species j

C ej :

concentration of component j returned to reactor inlet stream

C jρ :

concentration from reactor outlet

C je :

equilibrium concentration

E :

electrode potential

F :

Faraday number

i n :

partial current density of stepn

i T :

total current density

k :

deactivation rate constant

k f n :

forward electrochemical rate constant of stepn

k b n :

backward electrochemical rate constant of stepn

k f :

forward chemical reaction rate constant

k r :

reverse chemical reaction rate constant

k Lj :

mass transfer coefficient for species j

k a :

forward adsorption rate constant

k d :

reverse adsorption rate constant

L :

reactor length

r :

recycle ratio

t :

reaction time

u :

velocity

Q :

flow rate

x :

reactor dimension

α n :

constant describing potential dependency of reverse reaction rate constant

β n :

constant describing potential dependency of forward reaction rate constant

Γj :

surface concentration of adsorbed species j

σ :

electrode area per unit length

τ :

residence time of fluid in recycle loop

References

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  2. D. J. Pickett, ‘Electrochemical Reactor Design’, 2nd Ed., Elsevier Scientific Publishing Co., Amsterdam (1979).

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Author information

Authors and Affiliations

  1. Department of Chemical Engineering, Teesside Polytechnic, TS1 3BA, Middlesbrough, Cleveland, UK

    Keith Scott

Authors
  1. Keith Scott
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Scott, K. Recycle reactor models for complex electrochemical/chemical reaction systems. J Appl Electrochem 15, 659–670 (1985). https://doi.org/10.1007/BF00620561

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  • DOI: https://doi.org/10.1007/BF00620561

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