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Study on dynamics characteristics of wet air oxidation of non-ionic surfactants

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Abstract

Wet air oxidation is an effective method to deal with highly concentrated nondegradable emulsification wastewater which contains non-ionic surfactants. This article illustrates our investigation on dynamic characteristics of wet air oxidation of typical non-ionic surfactants like polyether, phenol ether and widely used alcohol ether. The experimental results indicated that the oxidation rate of polyether, phenol ether and alcohol ether obviously ascended as the temperature rose. A good oxidation effect was available at 240°C. The TOC removal rate could reach 88.0%, 94% and 91.5%, after 125 min reaction. Alcohol ether was prone to an easier oxidation compared with polyether and phenol ether when the temperature was 220°C or below. The oxidation rate of alcohol ether was higher than that of polyether at 160°C, while the oxidation rate of polyether was higher than that of phenol ether between 180°C and 220°C. During the later period of the reaction at 240°C, the rate of phenol ether was higher than that of alcohol ether, which was still higher than that of polyether. Partitioned first order kinetics model analysis showed that the apparent activation energy of alcohol ether was lower than that of both polyether and phenol ether in the leading stage and lagging stage, and it was easy to acquire a higher oxidation rate for alcohol ether at low temperature. Three parameter general dynamics model analyses showed that the reason why the oxidation rate of polyether was lower than that of alcohol ether was that the oxidation of polyether was more apt to be converted to intermediate production than that of alcohol ether, whereas between 200°C and 220°C, the direct oxidation rate of polyether and the oxidation rate of intermediate product were obviously lower than that of alcohol ether. The apparent activation energy of direct and indirect oxidation of polyether was 43.37 and 60.45 kJ·mol−1, respectively, while the corresponding apparent activation energy of alcohol was 38.74 and 58.09 kJ·mol−1, respectively.

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Authors and Affiliations

  1. School of Life Sciences and Technology, Tongji University, Shanghai, 200092, China

    XinPing Zeng

  2. Department of Chemistry, Tongji University, Shanghai, 200092, China

    WenWei Tang

  3. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China

    JianFu Zhao & GuoWei Gu

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  1. XinPing Zeng
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  2. WenWei Tang
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  3. JianFu Zhao
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  4. GuoWei Gu
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Correspondence to WenWei Tang.

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Zeng, X., Tang, W., Zhao, J. et al. Study on dynamics characteristics of wet air oxidation of non-ionic surfactants. Sci. China Ser. B-Chem. 51, 993–999 (2008). https://doi.org/10.1007/s11426-008-0102-8

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  • DOI: https://doi.org/10.1007/s11426-008-0102-8

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