Dortmund, Germany - German plant technology specialist Uhde, part of the ThyssenKrupp Group, has been awarded an engineering and procurement contract to build a hydrochloric acid electrolysis plant by Chinese TDI (toluene diisocyanate) manufacturer Yantai Juli.
The new plant, which will produce 100 kilotonnes of hydrochloric acid per annum, will be constructed at Laiyang, Shandong Province, China with commissioning scheduled for the end of 2011, a 7 Jan statement from ThyssenKrupp said.
Uhde's scope of supplies includes the process licence, major components of the engineering package, supply of the electrolysers, and assistance with the construction and commissioning of the plant, the statement said.
The membrane electrolysis plant will be used to convert the by-product hydrochloric acid which will be obtained in a new production line planned by Yantai Juli. The hydrochloric acid is converted into high-purity chlorine by the oxygen-depolarised cathode technology (ODC).
The ODC principle is based on oxygen reacting with hydrogen ions at the cathode side of the cell. This cathode reaction takes place at a notably lower cell voltage than that needed in conventional diaphragm electrolysis, according to Uhde. This allows an energy saving of up to 30 per cent. The anode reaction remains the same. Uhde says the ODC-technology-based membrane electrolysis provides a wide operating window and maximum process flexibility. (RD)