Electrochemical destruction of dinitrotoluene isomers and 2,4,6-trinitrotoluene in spent acid from toluene nitration process.
Mineralization of dinitrotoluene (DNT) isomers and 2,4,6-trinitrotoluene (TNT) in spent acid was conducted by in situ electrogenerated hydrogen peroxide. The electrolytic experiments were carried out to elucidate the influence of various operating parameters on the performance of mineralization of total organic compounds (TOC) in spent acid, including electrode potential, reaction temperature, oxygen dosage and concentration of sulfuric acid. It is worth noting that organic compounds could be completely mineralized by hydrogen peroxide obtained from cathodic reduction of oxygen, which was mainly supplied by anodic oxidation of water. Based on the spectra identified by gas chromatograph/mass spectrometer (GC/MS), it is proposed that oxidative degradation of 2,4-DNT and/or 2,6-DNT, 2,4,6-TNT results in o-mononitrotoluene (MNT) and 1,3,5-trinitrobenzene, respectively. Due to the removal of TOC and some amount of water, the electrolytic method established is promising for industrial application to regeneration of spent acid from toluene nitration process.
Chen
Wen-Shing
WS
Department of Chemical Engineering, National Yunlin University of Science & Technology, Yunlin 640, Taiwan. chenwen@yuntech.edu.tw
Liang
Jing-Song
JS
D000814:Aniline Compounds / Q000737:chemistry; D002625:Chemistry, Organic / Q000379:methods; D002849:Chromatography, Gas / Q000379:methods; D004136:Dinitrobenzenes / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods; D009584:Nitrogen / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D014050:Toluene / Q000031:analogs & derivatives / Q000032:analysis / Q000737:chemistry*; D014301:Trinitrobenzenes / Q000737:chemistry; D014303:Trinitrotoluene / Q000032:analysis / Q000737:chemistry*
D000814:Aniline Compounds; D004136:Dinitrobenzenes; D013464:Sulfuric Acids; D014301:Trinitrobenzenes; D014303:Trinitrotoluene; C035208:2-amino-4,6-dinitrotoluene; C029956:3-nitrotoluene; C029222:sym-trinitrobenzene; D014050:Toluene; C016403:2,4-dinitrotoluene; D006861:Hydrogen Peroxide; C023514:2,6-dinitrotoluene; D009584:Nitrogen; C033158:sulfuric acid; D010100:Oxygen