Hydrogen Peroxide Bleaching. On-Site Alkaline Peroxide Generation System.

Nozaki, Mineo

doi:10.2524/jtappij.52.616

Cited by 5 publications

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“…The electrochemical reactor employs a fixed-bed cathode composed of carbon black and Teflon-coated graphite chips of 40 to 60 mesh. [2][3][4] This technology produces typically a 4 wt % H 2 O 2 solution in 7 wt % NaOH with a specific energy consumption of 4 kWh kg H 2 O 2 Ϫ1 .…”

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The Surfactant-Promoted Electroreduction of Oxygen to Hydrogen Peroxide

Gyenge

Oloman

2005

J. Electrochem. Soc.

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The two-electron reduction of O2 at pH 3 (1 M Na2SO4 acidified by glacial acetic acid) and 9.6 (mixture of 0.5 M Na2CO3 and 0.5 M NaHCO3false) was investigated in flow-by electrochemical reactors with three-dimensional cathodes, consisting of graphite felt (GF) or reticulated vitreous carbon (RVC). The cathode was operated with co-current upward gas/liquid flow and O2 pressures in the range of 200-700 kPa. A factorial design with four variables at two levels was employed to investigate the effects of superficial current density, liquid load, O2 pressure, and cationic surfactant concentration [i.e., trioctylmethylammonium chloride (Aliquat® 336, A336)] on H2O2 concentration, current efficiency, and reactor voltage. Among the investigated variables A336 exerted the strongest positive main effect on both H2O2 concentration and current efficiency. The beneficial effect of A336 was due to suppression of the H2O2 loss by both electroreduction and surface-catalyzed decomposition. However, A336 increased the pressure gradient through GF by up to 100%. The surfactant effect on the pressure gradient was estimated using the Herbolzheimer-Park model for the influence of surfactant on the motion of gas bubbles in liquid-filled capillaries. An O2 mass-transfer model in both GF and RVC was developed and correlated with the experimental results. © 2005 The Electrochemical Society. All rights reserved.

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The Surfactant-Promoted Electroreduction of Oxygen to Hydrogen Peroxide

Gyenge

Oloman

2005

J. Electrochem. Soc.

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“…The TRL of the electrochemical production of H 2 O 2 via twoelectron ORR also depends on the pH value of the electrolyte: an industrial process (TRL = 9) in an alkaline environment is readily available 40 (Dow-Huron Cells 77,78 ), but the high alkalinity of the product limits its application because alkaline H 2 O 2 solutions are unstable. 79,80 We note that this instability already touches on the highly relevant aspect storability in the context of DR.…”

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Assessing the Realizable Flexibility Potential of Electrochemical Processes

Hoffmann

Hübner

Klaucke

et al. 2021

Ind. Eng. Chem. Res.

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Demand response is a viable concept to deal with and benefit from fluctuating electricity prices and is of growing interest to the electrochemical industry. To assess the flexibility potential of such processes, a generic, interdisciplinary methodology is required. We propose such a methodology, in which the electrochemical fundamentals and the theoretical potential are determined first by analyzing strengths, weaknesses, opportunities, and threats. Afterward, experiments are conducted to determine selectivity and yield under varying loads and to assess the additional long-term costs associated with flexible operation. An industrial-scale electrochemical process is assessed regarding its technical, economic, and practical potential. The required steps include a flow sheet analysis, the formulation and solution of a simplified model for operation scheduling under various business options, and a dynamic optimization based on rigorous, dynamic process models. We apply the methodology to three electrochemical processes of different technology readiness levelsthe syntheses of hydrogen peroxide, adiponitrile, and 1,2-dichloroethane via chloralkali electrolysisto illustrate the individual steps of the proposed methodology.

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Prospects for an industrial chemical oxygen-iodine laser

Vetrovec

1997

SPIE Proceedings

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Hydrogen Peroxide Bleaching. On-Site Alkaline Peroxide Generation System.

Cited by 5 publications

References 0 publications

The Surfactant-Promoted Electroreduction of Oxygen to Hydrogen Peroxide

The Surfactant-Promoted Electroreduction of Oxygen to Hydrogen Peroxide

Assessing the Realizable Flexibility Potential of Electrochemical Processes

Prospects for an industrial chemical oxygen-iodine laser

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