1999 Volume 53 Issue 8 Pages 1046-1053,036
Hydrogen peroxide is known as one of the important chemicals for pulping due to its excellent ability to bleach without formation of chlorinated organic compounds, which contributes to the good environment. This study was, therefore, carried out to develop on-site type electrochemical hydrogen peroxide production system that enables to produce hydrogen peroxide easily by cathodic reduction of oxygen, with easy enlarging the capacity.
The operating conditions were investigated using the laboratory cell in this study. Continuous operating conditions were investigated and the intermittent blowing of dry oxygen gas was clarified to be effective to the stable operation. Averaged current efficiency of 84.5% was obtained at 600 A/m2 for 600 hrs of continuos operation.
PSA oxygen was confirmed to be a practical oxygen source for the on-site production of hydrogen peroxide. The dosage of ethylenediaminetetra-acetic acid salt (EDTA) into anolyte improved the current efficiency from 85.3% to 94.4% and kept the operation stable without any deterioration of ion exchange membrane.
