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Oxygen depolarized cathode
Using energy efficiently and reducing CO2
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High-quality plastics like polyurethane depend on chlorine. Bayer has collaborated with partners to develop a highly energy-efficient method of chlorine production from hydrochloric acid, known as oxygen depolarized cathode technology. Targeted use of oxygen in this hydrochloric acid electrolysis process reduces energy consumption by 30 percent and thus also minimizes the plant’s CO2 emissions. In recognition of its achievement with the innovative process, the company was awarded the Environmental Prize of the German Federation of Industries (BDI) in 2008. The first large-scale plant of this kind went on stream at Bayer’s Brunsbüttel site in 2003. Here, plant assistant Jörg Bäther checks the oxygen feed pipes. Bayer plans to put another hydrochloric acid electrolysis plant, similarly equipped with energy-efficient hydrochloric acid electrolysis, into operation in China shortly, with an annual capacity of 215,000 tons of chlorine.
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