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Journal of Applied Electrochemistry

, Volume 17, Issue 6, pp 1213–1222 | Cite as

Electro-oxidation rate ofp-tert-butyltoluene in a bipolar packed-bed electrode cell

  • Hark Joon Kim
  • Katsuki Kusakabe
  • Satoko Hokazono
  • Shigeharu Morooka
  • Yasuo Kato
Papers

Abstract

The side chain methoxylation ofp-tert-butyltoluene was carried out in a bipolar packed-bed electrode cell in which graphite pellets of diameter 4.74 mm and length 5mm were randomly packed in nine layers separated by inert mesh spacers. The reaction consisted of main consecutive reactions leading top-tert-butylbenzyl methyl ether andp-tert-butylbenzaldehyde dimethyl acetal (TBDA) and polymerization reactions. Overall reaction rate coefficients for each reaction step, current efficiency and energy consumption were determined on the basis of a reactor model. The selectivity and the current efficiency for TBDA increased with increasing current, but the energy consumption began to rise when the current exceeded 0.8 A. An addition of supporting electrolyte suppressed the overall reaction rate coefficients, although it decreased the energy consumption.

Keywords

Polymerization Methyl Acetal Ether Graphite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

Ce

overall current efficiency

C1

concentration of i-component as a function of time. (i represents BT for TBT, ME for TBME and DA for TBDA) (mol m−3)

E

cell voltage (V)

Ec

energy consumption (J kg−1)

e

potential difference between upper and lower ends of each pellet (V)

ed

decomposition voltage (V)

F

Faraday constant (C mol−1)

Io

bypass current (A)

Ib

faradaic current (A)

Il

total current (A)

K1,k2,k3

overall reaction rate coefficient, defined by Equation 13 (ms−1)

Mi

molecular weight of i-component (i represents ME for TBME and DA for TBDA) (kg mol−1)

n

number of pellet layers

Rb

equivalent resistance for bypass current (Ω)

Rp

equvalent resistance for faradaic current (Ω)

Rs

equivalent resistance for total current (i.e. spacer resistance) (Ω)

S

total surface area of anodic part of bipolarized pellets in cell (m2)

t

time (s)

W

volume of electrolyte (m3)

z

number of electrons transferred in electrochemical reaction

η

intrinsic current efficiency

Subscript

o

refers to initial values

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Copyright information

© Chapman and Hall Ltd. 1987

Authors and Affiliations

  • Hark Joon Kim
    • 1
  • Katsuki Kusakabe
    • 1
  • Satoko Hokazono
    • 1
  • Shigeharu Morooka
    • 1
  • Yasuo Kato
    • 1
  1. 1.Department of Applied ChemistryKyushu UniversityFukuoka 812Japan

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