Extraction of Nitrogen Compounds from Tobacco Waste via Thermal Treatment

Min Wei, Fu Yang, Xuyan Song, Ran Li, Xi Pan, Qiang Gao, Yunlu He, Mingqiao Ye and Hongyun Hu
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Min Wei: Technology Center of China Tobacco Hubei Industry limited-liability Company, Wuhan 430040, China
Fu Yang: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Xuyan Song: Technology Center of China Tobacco Hubei Industry limited-liability Company, Wuhan 430040, China
Ran Li: Technology Center of China Tobacco Hubei Industry limited-liability Company, Wuhan 430040, China
Xi Pan: Technology Center of China Tobacco Hubei Industry limited-liability Company, Wuhan 430040, China
Qiang Gao: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Yunlu He: Technology Center of China Tobacco Hubei Industry limited-liability Company, Wuhan 430040, China
Mingqiao Ye: Technology Center of China Tobacco Hubei Industry limited-liability Company, Wuhan 430040, China
Hongyun Hu: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2020, vol. 13, issue 18, 1-11

Abstract: Alkaloids, typical nitrogen compounds, were found to be abundant in tobacco waste. The recovery of alkaloids from tobacco waste for biological pesticides could reduce the use of traditional chemical pesticides and avoid the pollution of farmland by the leaching of alkaloids from tobacco waste. Considering the fact that alkaloids can easily volatilize, thermal treatment is expected to be a potential technology to achieve the release and recovery of alkaloids from tobacco waste. For better understanding of conversion behavior of nitrogen-containing compounds in tobacco waste during thermal treatment, purge/trap-GC/MS (gas chromatography mass spectrometry), PY-GC/MS (pyrolysis-gas chromatography mass spectrometry), and fixed-bed/ATD-GC/MS (auto-thermal desorption gas chromatography mass spectrometry) were adopted to detect the ingredients and concentration of nitrogen-containing compounds in tobacco waste and/or volatiles. The results of purge/trap-GC/MS showed that nitrogen-containing compounds in tobacco waste could be effectively evaporated at 180 °C in the forms of N-benzyl-N-ethyl-P-isopropyl benzamide, 2-Amino-4-methylphenol, or N-butyl-tert-butylamine. Specifically, N-benzyl-N-ethyl-P-isopropyl benzamide was the main nitrogenous compound in the volatiles of tobacco wastes accordingly. (S)-3-(1-Methyl-2-pyrrolidinyl) pyridine was dominant in N-compounds in pyrolysis condition according to the results of Py-GC/MS. In air atmosphere, with the heating temperature increasing, the concentration of main (S)-3-(1-Methyl-2-pyrrolidinyl) pyridine was firstly increased and then decreased. Besides, the interactions between the released volatiles could be accelerated at a high temperature. Accordingly, these findings suggested that pyrolysis under proper conditions could effectively promote the extraction of alkaloids from tobacco waste.

Keywords: tobacco waste; pyrolysis; nitrogen compounds; thermal extraction; species distinguishment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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