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<p>Nitrification waste (NW), a perilous by-product of chemical synthesis, poses considerable thermal safety hazards owing to the likelihood of thermal runaway reactions during storage. This study methodically examined the impact of sodium fluoride (NaF) and sodium chloride (NaCl) on the thermal stability and reaction kinetics of NW by differential scanning calorimetry. The results demonstrated that both NaF and NaCl markedly diminished the heat of reaction, hence lowering the danger potential. The addition of NaF significantly reduced the apparent activation energy (<i>E</i><sub>a</sub>) of NW in Stage I from 200.8 to 188.2&#xa0;kJ&#xa0;mol<sup>−1</sup>, implying enhanced reactivity, while NaCl exhibited a slight rise in <i>E</i><sub>a</sub> to 201.7&#xa0;kJ&#xa0;mol<sup>−1</sup>, indicating a stabilizing effect. Kinetic modeling by multiple linear regression demonstrated intricate, multistep breakdown pathways that include both autocatalytic and nth-order reactions. Both halides significantly elevated the critical explosion temperature, hence improving safety margins. This research offers critical thermokinetic insights and practical recommendations for the safer handling and disposal of nitrification wastes.</p>

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Investigation of thermal stability enhancement of nitrification waste from electronic manufacturing plants using sodium halides via calorimetric and thermokinetic analysis

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • An-Chi Huang,
  • Heng-Zao Yang,
  • Jun-Cheng Jiang,
  • Chung-Fu Huang

摘要

Nitrification waste (NW), a perilous by-product of chemical synthesis, poses considerable thermal safety hazards owing to the likelihood of thermal runaway reactions during storage. This study methodically examined the impact of sodium fluoride (NaF) and sodium chloride (NaCl) on the thermal stability and reaction kinetics of NW by differential scanning calorimetry. The results demonstrated that both NaF and NaCl markedly diminished the heat of reaction, hence lowering the danger potential. The addition of NaF significantly reduced the apparent activation energy (Ea) of NW in Stage I from 200.8 to 188.2 kJ mol−1, implying enhanced reactivity, while NaCl exhibited a slight rise in Ea to 201.7 kJ mol−1, indicating a stabilizing effect. Kinetic modeling by multiple linear regression demonstrated intricate, multistep breakdown pathways that include both autocatalytic and nth-order reactions. Both halides significantly elevated the critical explosion temperature, hence improving safety margins. This research offers critical thermokinetic insights and practical recommendations for the safer handling and disposal of nitrification wastes.