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May Chementator briefs

By Gerald Ondrey |

  A new Cl2 process Oxygen-depolarized cathodes (ODCs) will be used for the first time to produce chlorine on an industrial scale in a 20,000 metric ton per year (m.t./yr) electrolyzer at the Krefeld-Uerdingen chemical park in Germany. The plant will be constructed for Bayer MaterialScience AG (BMS; www.bayermaterialsciences.com) by Uhde GmbH (Dortmund, both Germany; www.uhde.eu), and is slated for startup in the first half of 2011. ODCs are O2-consuming, gas-diffusion electrodes that separate caustic from the O2 side. The O2 diffuses into the porous electrode structure to catalyst centers and reacts with cathodic water to produce hydroxide ions (CE, May 2007, pp. 50–55). Because the ODC allows the electrolyzer to operate at lower voltages, energy requirements for producing Cl2 are reduced by up to 30%, says BMS. The commercial unit will use ODCs in NaCl-based electrolyzer cells developed by by Uhde and UhdeNora S.p.A. (Milan, Italy; www.uhdenora.com). BMS has also used its ODC technology based on hydrochloric-acid electrolysis at the Bayer Integrated Site Shanghai in China, and in Brunsbüttel, Germany. Biomass to SNG Haldor Topsøe S/A (Lyngby, Denmark; www.topsoe.com) will participate in the design of what is…
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