Fundamental studies on the kinetics of formation of chlorine dioxide have led to an hypothesis concerning the mechanism of the reactions involved. This has lead to improvements in the manufacture of this important bleaching and oxidizing agent. Older processes have been made more efficient and some new ones have been developed.
A new process, patented by the author and assigned to Electric Reduction Co. of Canada Limited in Canada, and to Hooker Chemical Corporation in the United States, employing sodium chlorate, sodium chloride and sulphuric acid as raw materials, is outlined. Recent improvements in the Mathieson, Solvay and Day-Kesting processes are reviewed, as well as the new Columbia-Southern modifications of the Persson process.
Trends in absorption tower design, in materials of construction and in bleaching with chlorine dioxide are briefly indicated.