Oxidation Efficiencies of Potassium Persulfate and Hydrogen Peroxide in Pressurized Hot Water with and without Preheating
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- 作者：Juhani Kronholm ; Pentti Jyske ; and Marja-Liisa Riekkola
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2000
- 出版时间：July 2000
- 年：2000
- 卷：39
- 期：7
- 页码：2207 - 2213
- 全文大小：168K
- 年卷期：v.39,no.7(July 2000)
- ISSN：1520-5045
文摘
Potassium persulfate was compared with hydrogen peroxide as oxidant in pressurized hot water.Oxidant (in excess) and organic model pollutants (phenol, 2,3-dichlorophenol, and m-cresol, c =0.3-0.5 mM each) were introduced to the reaction capillary with and without preheating.Reaction time was 4-57 s, temperature 80-400 
C, and pressure 220-310 bar. Withoutpreheating, potassium persulfate was clearly more efficient than hydrogen peroxide in oxidizingthe model compounds: for example, with potassium persulfate, removal percentages close to100 were obtained in 55 s at 110 C, whereas with hydrogen peroxide the required temperatureto obtain similar results in any reaction time was nearly 300 C. Total organic carbon wasremoved more effectively by potassium persulfate under mild conditions. Overall, oxidationefficiencies were decreased when capillaries were preheated, especially with potassium persulfateas oxidant. Corrosion, measured as Ni concentration of the effluent, was more severe withpotassium persulfate than hydrogen peroxide.
C, and pressure 220-310 bar. Withoutpreheating, potassium persulfate was clearly more efficient than hydrogen peroxide in oxidizingthe model compounds: for example, with potassium persulfate, removal percentages close to100 were obtained in 55 s at 110 C, whereas with hydrogen peroxide the required temperatureto obtain similar results in any reaction time was nearly 300 C. Total organic carbon wasremoved more effectively by potassium persulfate under mild conditions. Overall, oxidationefficiencies were decreased when capillaries were preheated, especially with potassium persulfateas oxidant. Corrosion, measured as Ni concentration of the effluent, was more severe withpotassium persulfate than hydrogen peroxide.