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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27616


    標題: Optimization of Thiophene Removal by an Ultrasound-Assisted Oxidative Desulfurization Process
    作者: Chen, Teng-Chien
    Shen, Yun-Hwei
    Lee, Wen-Jhy
    Lin, Chih-Chung
    Wan, Meng-Wei
    貢獻者: 環境工程與科學系
    關鍵字: Optimization
    Oxidative Desulfurization
    Thiophene
    Ultrasound
    Uaod Process
    日期: 2012-07
    上傳時間: 2014-03-21 16:15:22 (UTC+8)
    出版者: Mary Ann Liebert Inc
    摘要: Thiophene (T) is considered one of the most refractory organic sulfur compounds in oxidative desulfurization. This study used an ultrasound-assisted oxidative desulfurization process to optimize T oxidation on a bench scale. Four control factors, including durations of sonication, the amounts of transition metal catalyst (TMC), phase transfer agent (PTA), and hydrogen peroxide, were carefully examined. The best operation condition, evaluated by using the analysis of variance, was found at mass ratios of T:H2O2:PTA:TMC at 1:1.5:0.005:0.01 with 20 min of sonication, where almost 73.5% of T, 89.9% of benzothiophene (BT), and 100% of dibenzothiophene (DBT) were oxidized to their corresponding sulfones. Moreover, the electron density on the sulfur atom of various compounds, including T, BT, and DBT, and their methyl-substituted derivatives and oxidation rate constants were also examined. The oxidative reactivity of sulfur compounds increased with the increasing electron density on sulfur atoms. The T that is commonly considered more difficult to the oxidized is attributed to the combined effect of low electron density of the sulfur atom and low boiling temperature under mild oxidation reaction. This information is essential for the deep desulfurization process under oxidative conditions.
    Appears in Collections:[環境工程與科學系(所)] 期刊論文

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