N,N-dimethylformamide decomposition by DC water plasma at atmospheric pressure

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Abstract

The decomposition of a high concentration N,N-Dimethylformamide (DMF) solution by water thermal plasma was demonstrated. The result showed that DMF solutions of warying concentration (4,050-174,000 mg/L) was successfully decomposed. Decomposition rates of more than 94% was achieved, with the highest energy efficiency being 41.2 g/kWh. The temperature of the nozzle exit was measured to be 5,000-7,400 K, this extremely high temperature and O, H-radical-rich atmosphere inhibited the formation of byproducts like NOx. The major products of gas effluent are H2 (59-60%), CO (28-29%), CO2 (6-8%), and N2 (3-5%). The main form of nitrogen in the liquid effluent was nitrate nitrogen (NO3-N). Reaction pathways were proposed as follow: first, DMF dissociates into N, CH3, and CHO radicals in the arc region by electron impact; second, thermal decomposition and radical reactions with radicals like NHx and CHx occur in the plasma flame region; finally, recombination and oxidation occurs to form the products, such as N2, CO, and CO2 in the downstream region.

Original languageEnglish
Pages (from-to)486-492
Number of pages7
JournalJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume54
Issue number9
DOIs
Publication statusPublished - Sep 20 2021

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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