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Macrokinetics of magnesium sulfite oxidation inhibited by ascorbic acid
Wang Lidong1, Ma Yongliang, Zhang Wendi
1School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China. wld@tsinghua.edu.cn
Journal of Hazardous Materials
|May 23, 2013
Summary
Ascorbic acid effectively inhibits magnesium sulfite oxidation in magnesia flue gas desulfurization. This study details the kinetics, revealing its crucial role in enhancing sulfite recovery for industrial applications.
Area of Science:
- Environmental Chemistry
- Chemical Engineering
- Industrial Processes
Background:
- Magnesia flue gas desulfurization is vital for reducing sulfur dioxide emissions from industrial boilers.
- Controlling magnesium sulfite oxidation is critical for efficient product recycling in this process.
Purpose of the Study:
- To evaluate the efficacy of various inhibitors on magnesium sulfite oxidation.
- To investigate the macrokinetics of magnesium sulfite oxidation when inhibited by ascorbic acid.
Main Methods:
- Kinetic experiments were conducted to compare four different inhibitors.
- Macrokinetic studies were performed in a stirred reactor with bubbling to analyze influencing factors.
- The reaction rate orders and apparent activation energy were determined.
Main Results:
- Ascorbic acid was identified as the most effective inhibitor for magnesium sulfite oxidation.
- The reaction rate showed a -0.55 order dependence on ascorbic acid concentration and a 0.77 order on oxygen partial pressure.
- The apparent activation energy for the inhibited oxidation was found to be 88.0 kJ mol(-1).
Conclusions:
- The oxidation rate of magnesium sulfite, when inhibited by ascorbic acid, is primarily governed by the intrinsic chemical reaction.
- The findings offer valuable insights for optimizing sulfite recovery in magnesia desulfurization processes.
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