芬顿氧化法对甲苯硝化过程中废酸中二硝基甲苯和三硝基甲苯的矿化作用。
Mineralization of dinitrotoluenes and trinitrotoluene of spent acid in toluene nitration process by Fenton oxidation.
作者信息
Chen Wen-Shing, Juan Chien-Neng, Wei Kuo-Ming
机构信息
Department of Chemical Engineering, National Yunlin University of Science and Technology, 123 University Road, Yunlin 640, Taiwan, ROC.
出版信息
Chemosphere. 2005 Aug;60(8):1072-9. doi: 10.1016/j.chemosphere.2005.01.021. Epub 2005 Feb 17.
Fenton's reagent, UV/H2O2 and UV/Fenton's reagent were employed to mineralize dinitrotoluene (DNT) isomers and 2,4,6-trinitrotoluene (TNT) of spent acid in toluene nitration process. The bench-scale experiments were conducted to elucidate the influence of various operating variables on the performance of removal of total organic compounds (TOC) from spent acid, including reaction temperature, concentration of ferrous ion and H2O2 dosage. It is remarkable that organic compounds were completely mineralized by Fenton oxidation, of which removal efficiency is superior to that of UV/H2O2. Nevertheless, it makes slight difference between Fenton oxidation and UV/Fenton oxidation. According to the spectra identified by gas chromatograph/mass spectrometer (GC/MS), it is proposed that oxidative degradation of DNT isomers leads to o-, m-, p-mononitrotoluene (MNT) and 1,3-dinitrobenzene respectively. Besides, the oxidation of 2,4,6-TNT gives the 1,3,5-trinitrobenzene intermediate. Apparently, Fenton oxidation is promising for purification of spent acid industrially.
采用芬顿试剂、紫外/过氧化氢和紫外/芬顿试剂对甲苯硝化过程废酸中的二硝基甲苯（DNT）异构体和2,4,6-三硝基甲苯（TNT）进行矿化处理。进行了实验室规模的实验，以阐明各种操作变量对废酸中总有机化合物（TOC）去除性能的影响，包括反应温度、亚铁离子浓度和过氧化氢用量。值得注意的是，有机化合物通过芬顿氧化完全矿化，其去除效率优于紫外/过氧化氢。然而，芬顿氧化和紫外/芬顿氧化之间的差异不大。根据气相色谱/质谱仪（GC/MS）鉴定的光谱，提出DNT异构体的氧化降解分别导致邻、间、对一硝基甲苯（MNT）和1,3-二硝基苯。此外，2,4,6-TNT的氧化产生1,3,5-三硝基苯中间体。显然，芬顿氧化在工业上对废酸净化具有广阔前景。
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