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• W2498045261 abstract "Chlor-alkali electrolysis, the electrolytic splitting of NaCl solutions, is an energy intensiveprocess. The most modern variant, the membrane electrolysis process, has been continuouslyimproved over the last decades. Nevertheless, the average energy demand with the currentstate of the art of this technology is 2292 kWh/tCl2 at 6 kA/m2. Consequently, any reductionof the electrical energy demand in chlor-alkali electrolysis would be highly desirable for botheconomic and environmental reasons. Replacing hydrogen evolving reaction by oxygenreduction reaction can reduce the energy demand by approximately 30%. In this workmathematical models for steady and dynamic operation of an industrial scale chlor-alkalielectrolysis cell with ODC are developed. The steady state model predicts the distributions oftemperature, concentration, current density, and overpotential as a function of height. At anindustrially relevant current density of 4 kA/m2 neither current density nor overpotentialsexhibit strong variations along the cell height. Main reason for this behaviour is theuniformity of temperature distributions in the solid compartments of the cell (anode,membrane, ODC) which can be explained by efficient heat transfer between the electrodesand the electrolyte streams. This is especially true for the caustic solution, through whichmost of the irreversible heat released in the cell is removed. However, the temperature of theoxygen stream increases slowly along the height. Due to the initially low temperatures andthe low water content of the inlet oxygen stream, the gas phase takes up considerable netamounts of water vapor. Nevertheless, the oxygen partial pressure at the electrochemicallyactive regions of the ODC remains high allowing for efficient operation of the cathode.Operating cell at higher current requires better heat management as the heat production isperformance of the electrode significantly. The dynamic model also predicts the performanceof the electrode under the ripple voltage. However, Current Interruption (CI) measurementshave been used to validate this model. Due to ripples, hysteresis appears even at lowfrequency of 100 Hz. As frequency increases the amplitudes of current oscillation reduce. Nosignificant difference in the hysteresis can be seen after lowering the oxygen partial pressuredown to 75%.%%%%CAhblsotrr-aaclkt:a li electrolysis, the electrolytic splitting of NaCl solutions, is an energy intensiveprocess. The most modern variant, the membrane electrolysis process, has been continuouslyimproved over the last decades. Nevertheless, the average energy demand with the currentstate of the art of this technology is 2292 kWh/tCl2 at 6 kA/m2. Consequently, any reductionof the electrical energy demand in chlor-alkali electrolysis would be highly desirable for botheconomic and environmental reasons. Replacing hydrogen evolving reaction by oxygenreduction reaction can reduce the energy demand by approximately 30%. In this workmathematical models for…" @default.
• W2498045261 created "2016-08-23" @default.
• W2498045261 creator A5004101003 @default.
• W2498045261 date "2016-06-09" @default.
• W2498045261 modified "2023-09-26" @default.
• W2498045261 title "Steady-state and dynamic modeling of a chlor-alkali cell with oxygen depolarized cathode" @default.
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• W2498045261 doi "https://doi.org/10.21268/20160609-122150" @default.
• W2498045261 hasPublicationYear "2016" @default.
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