Konox process

The Konox process is a liquid-phase oxidation process based on the use of an iron complex. The process was developed in Japan in 1975 by Sankyo to replace the Ferrox process in the treatment of coke oven gas. 

Elemental sulfiir formed in the Konox process is suspended in the solution as fine particles varying from 1 to 4 microns in size. The sulfur is normally separated from the spent Konox solution by continuous filtration. When the solution contains insufficient active iron, or when the alkalinity becomes too low, the sulfur particles grow in size and float to form a froth at the lop of the absorber vessel. 

When the process was first introduced, it was claimed that utility and chemical requirements for the Konox process compared favorably with those of contemporary competing processes. A comparison of operating data for several well established H2S removal processes of that period is given in Table 9-33 (Kasai, 1975). 

Kasai, T., 1975, Konox process removes H2S, Hydro. Process., February, pp. 93-95. 

Konox A process for removing hydrogen sulfide from industrial gases by absorption in aqueous sodium ferrate (Na2Fe04) solution. The ferrate is reduced to ferrite (NaFe02) and the sulfide is oxidized to elemental sulfur. The main reactions are ... 

This has a deleterious effect on the process because the contact time required for regeneration is a function of the concentration of iron and sodium carbonate in the spent solution. The higher the concentration of sodium carbonate, the longer the time needed to regenerate the Konox solution. 

Comparison of Konox Operating Data WMi Other Commerciat Liquid Redox Processes... 

---