Effect of inhibitors on macroscopical oxidation kinetics of calcium sulfite.
In the presence of inhibitors, the macroscopical oxidation kinetics of calcium sulfite, the main byproduct in wet limestone scrubbing, was studied for the first time by adding different inhibitors and varying pH, concentration of calcium sulfite, oxygen partial pressure, concentration of inhibitors and temperature. The mathematical model about the general oxidation reaction was established, which was controlled by three steps involving dissolution of calcium sulfite, mass transfer of oxygen and chemical reaction in the solution. It was concluded that the general reaction was controlled by mass transfer of oxygen under uncatalyzed conditions, while it was controlled by dissolution of calcium sulfite after adding three kinds of inhibitors. Thus, the theory was provided for investigating the mechanism and oxidation kinetics of sulfite. The beneficial references were also supplied for design of oxidation technics in the wet limestone scrubbing.
Zhao
Yi
Y
School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China. hgxzy@sina.com
Wang
Li-Dong
LD
Wang
Xiao-Ming
XM
Li
Qiang-Wei
QW
Xu
Pei-Yao
PY
D000975:Antioxidants / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006873:Hydroquinones / Q000737:chemistry; D007700:Kinetics; D008962:Models, Theoretical; D009391:Nephelometry and Turbidimetry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D019800:Phenol / Q000737:chemistry; D013447:Sulfites / Q000737:chemistry*; D013696:Temperature
D000975:Antioxidants; D006873:Hydroquinones; D013447:Sulfites; D019800:Phenol; D010100:Oxygen; D002118:Calcium; C031927:hydroquinone