NaCl-ODC electrolysis technology, which is marketed by thyssenkrupp Uhde Chlorine Engineers, was invented and developed in cooperation with Covestro. Covestro contributed their oxygen-depolarized cathodes (ODCs), which are integrated in the NaCl-ODC electrolysis cells (single element technology) developed by thyssenkrupp Uhde Chlorine Engineers.
Your benefits at a glance
- Up to 25% reduction of energy consumption compared with conventional membrane-based technology
- Ecologically valuable solution due to corresponding CO2 emission reductions
- Full compatibility of electrolysis cells and brine cycle allows combination of both technologies in one plant
- Higher site flexibilities regarding electricity and hydrogen supplies
- Reliable and proven technology
The NaCl-ODC electrolysis process differs from the conventional membrane process on the catholyte side whereas the anolyte side remains unaffected. On the cathode side, oxygen is also introduced which suppresses the formation of hydrogen. This leads to a significant reduction of the cell voltage. Consequently, ODC technology cuts energy consumption by up to 25%. Or vice versa, at constant energy consumption, a corresponding capacity increase is possible. In efficiency analysis of the technology, the costs of oxygen production in air liquefaction plants and the absence of hydrogen marketing or application opportunities have to be considered and may slightly mitigate the total returns due to energy savings.
As a result, ODC technology is ecologically valuable and supports clients’ sustainability. By saving energy, clients indirectly achieve significant CO2 emission reductions. Full compatibility of electrolysis cells and brine cycle easily allows the new NaCl-ODC and the conventional membrane technologies to be combined in one plant. Conventional membrane technology may be converted to ODC technology – partly or in full. Modifications of the catholyte cycle and the oxygen system have to be considered. In addition, clients may benefit from higher flexibilities in electricity supply and hydrogen provision of their sites.