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ODC technology 15 The ODC process NaOH 30 % O2 Support structure Elastic element ODC Percolator O2 Cathode Anode Collecting channel Anode electrode Membrane Downcomer 300g NaCl / l NaOH 32% 210g NaCl / l + Cl2 2 NaCl + H2O + 1⁄2 O2gCl2 + 2 NaOH The ODC structure itself consists of a current distributor (woven metal mesh), a catalyst and a binder. The current distributor acts as a support structure for the catalyst and the binder. The reaction proceeds in several steps: It starts with permeation of oxygen into the porous ODC structure followed by a second step, in which oxygen dissolves in the caustic electrolyte and diffuses on the catalyst surface. Oxygen is then chemically reduced and the reaction products are removed by convective transport. Characteristic for the process is the 3-phase boundary of liquid, gas and solid at the catalyst surface where the reaction occurs. This is essential to bring oxygen, caustic and catalyst in contact for the reaction and it sets our cell design apart from other technologies.PDF Image | Chlor-Alkali Electrolysis
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