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Titolo:
OPTIMAL TIME-VARYING CELL-VOLTAGE CONTROL OF A PARALLEL-PLATE REACTOR
Autore:
BAKSHI R; FEDKIW PS;
Indirizzi:
N CAROLINA STATE UNIV,DEPT CHEM ENGN RALEIGH NC 27695 N CAROLINA STATE UNIV,DEPT CHEM ENGN RALEIGH NC 27695
Titolo Testata:
Journal of Applied Electrochemistry
fascicolo: 11, volume: 24, anno: 1994,
pagine: 1116 - 1123
SICI:
0021-891X(1994)24:11<1116:OTCCOA>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
POTENTIAL CONTROL; NITROBENZENE; REDUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
R. Bakshi e P.S. Fedkiw, "OPTIMAL TIME-VARYING CELL-VOLTAGE CONTROL OF A PARALLEL-PLATE REACTOR", Journal of Applied Electrochemistry, 24(11), 1994, pp. 1116-1123

Abstract

As a means to illustrate the calculation of an optimal cell-voltage control for a parallel-plate reactor, we determine the time-varying cell voltage that maximizes p-aminophenol produced from the electroreduction of nitrobenzene in a differential-conversion reactor operated in abatch mode; that is, the electrolyte is continuously recirculated from a batch holding tank through the reactor in which a low conversion per pass occurs. A rationale is given for restricting the search for the optimal control for this particular reaction network to a chattering-cell voltage that switches between a priori chosen minimum and maximum values. The optimal, time-varying duty cycle is computed using a gradient-search technique. The predicted concentrations are dependent upon the reaction time; for the conditions examined here, an improvement of twenty-five percent in the production and nine-hundred percent in the selectivity of p-aminophenol may be achieved by using the optimal, time-varying voltage in comparison to the best steady value. Since a chattering control is a mathematical construct, we illustrate that a rectangular, high-frequency waveform may be applied to yield results which are indistinguishable from those effected by a chattering cell voltage. The period of the waveform must be short enough so that surface concentrations are time invariant over it and yet, simultaneously, mustbe long enough so that double-layer charging does not account for a significant passage of coulombs.

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Documento generato il 13/07/20 alle ore 18:09:35