Uhdenora S.p.A.

OPERATING CONDITIONS OF PERFORMANCES
The electrolyser works with a current density of 5 kA/m2.
The operating temperature is 50°C and the anodic pressure is 0.2-0.25 bar g.
The pressure of the cathodic chambers, where oxygen is fed, is atmospheric.
The above data show that the differential pressure between the anodic and the cathodic compartments is high (around 2000 mm H2O) compared with the few hundreds millimiters of water that are normally applied in membrane electrolysers. This means that, even in presence of pressure fluctuations in the chlorine header, the membrane is always pressed and well kept in his initial position. As a practical consequence the membrane is not stressed and therefore its life prolonged in the time.
As long as the membrane life is concerned, it shall be added that not only the mechanical integrity of the membranes is safeguarded for the reasons explained above, but also the efficiency remains constant over the time. This is a direct consequence of the fact that no impurities can settle in the membrane.
Oxygen is fed to the cathodes with a 10% excess over the stoichiometric value.
Concentration of hydrochloric acid fed to the anode is about 15%.
The acid concentration in the acid drain from cathode is about 1%.

At the above standard operating conditions the expected power consumption is 1100-1200 kWh (depending on membrane and components selection).

The produced chlorine concentration is 99.9%. As it can be seen, the chlorine quality is very high, much better than the quality that it is possible to obtain with any other technology on the market, including also the electrolysis of NaCl brines with mercury, diaphragm or membrane electrolysers.
Such a high quality means that for several purposes it will be possible to feed the chlorine to the final user without the need of any purification stage (e.g. chlorine compression without need of liquefaction /evaporation).