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<p>Lysine sulfate (LS) is a crucial feed addictive, and several lysine sulfate dust explosion accidents occurred in industrial production. According to the accident investigation, the cause could be related to the self-heating of LS exposed to water. Therefore, the TG-DSC simultaneous thermal analysis method is used to explore the influence of moisture content on the thermal decomposition behaviors of LS. Based on the analysis of TG-DSC curve, the three-stage thermal decomposition mechanism of LS is proposed: (1) Stage I (200–300 °C): desulfurization and decarboxylation, (2) Stage II (300–500 °C): deamination, and (3) Stage III (500–700 °C): oxidation of the intermediate products generated in the first two stages. The mass loss during Stage I is about 38%, which agrees well with the theoretical value of the mass loss for desulfurization and decarboxylation. A small amount of water increases the peak mass loss rate and reduces the onset temperature, confirming that a proper amount of water promotes the thermal decomposition of lysine sulfate. According to the activation energy <i>E</i><sub>a</sub> obtained by the KAS method, <i>E</i><sub>a</sub> is not a constant during the decomposition, but varies with conversion rate <i>α</i>. <i>E</i><sub>a</sub> increased slightly with <i>α</i> in Stage I, showed a sharp rise and drop in Stage II, and then kept almost constant in Stage III. <i>E</i><sub>a</sub> showed an overall reduction in all the three stages, which means the increase of water content decreased the thermal stability of LS.</p>

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Effects of moisture content on the thermal decomposition behaviors of lysine sulfate

  • 期刊论文

  • 发表日期：

    2025年5月3日

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  • Yue Chen,
  • Leqing Ren,
  • Wei Tian,
  • Hui Wang,
  • Gumbo Harmon,
  • Xiankai Zhang,
  • Junheng Wang

摘要

Lysine sulfate (LS) is a crucial feed addictive, and several lysine sulfate dust explosion accidents occurred in industrial production. According to the accident investigation, the cause could be related to the self-heating of LS exposed to water. Therefore, the TG-DSC simultaneous thermal analysis method is used to explore the influence of moisture content on the thermal decomposition behaviors of LS. Based on the analysis of TG-DSC curve, the three-stage thermal decomposition mechanism of LS is proposed: (1) Stage I (200–300 °C): desulfurization and decarboxylation, (2) Stage II (300–500 °C): deamination, and (3) Stage III (500–700 °C): oxidation of the intermediate products generated in the first two stages. The mass loss during Stage I is about 38%, which agrees well with the theoretical value of the mass loss for desulfurization and decarboxylation. A small amount of water increases the peak mass loss rate and reduces the onset temperature, confirming that a proper amount of water promotes the thermal decomposition of lysine sulfate. According to the activation energy Ea obtained by the KAS method, Ea is not a constant during the decomposition, but varies with conversion rate α. Ea increased slightly with α in Stage I, showed a sharp rise and drop in Stage II, and then kept almost constant in Stage III. Ea showed an overall reduction in all the three stages, which means the increase of water content decreased the thermal stability of LS.