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<p>A COMSOL Multiphysics-based model was developed to simulate medical transfusion tubing (MTT) pyrolysis using a "two-step five-reaction" kinetic scheme. This approach systematically elucidates how critical parameters, such as the heating rate (5–50&#xa0;°C/min), pyrolysis temperature (400–500&#xa0;°C), and reaction heat, govern the product yield and heat/mass transfer dynamics. The results demonstrated a strong dependence of the reaction rate on the pyrolysis temperature. Complete MTT conversion was achieved at 500&#xa0;°C within 9.2&#xa0;min, whereas lower temperatures (400–425&#xa0;°C) retained 11.9% and 1.8% of intermediate solids after 60&#xa0;min. Furthermore, the reaction rate was governed by both the heat supply and reactant concentration, highlighting the intricate coupling between thermal and chemical dynamics. Parallel/tandem reaction pathways were resolved for volatile and solid products, and the heating rate increased (5–50&#xa0;°C/min), elevating the volatile<sub>2</sub> yield (15.4–17.5%) and reducing the volatile<sub>1</sub> (33.6–32.1%) and solid<sub>2</sub> (11.1–10.4%) yields. An increase in pyrolysis temperature (400–500&#xa0;°C) increased the concentration of Volatile<sub>2</sub> (9.9–17.5%). Endothermic delays prolonged internal temperature equilibration by 79.7% (1.6–7.9&#xa0;min).</p>

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Modeling and simulation of the medical transfusion tubing pyrolysis process

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Zhipeng Zhou,
  • Hongting Ma,
  • Shuo Ma,
  • Lei Zhang,
  • Kexun Wang

摘要

A COMSOL Multiphysics-based model was developed to simulate medical transfusion tubing (MTT) pyrolysis using a "two-step five-reaction" kinetic scheme. This approach systematically elucidates how critical parameters, such as the heating rate (5–50 °C/min), pyrolysis temperature (400–500 °C), and reaction heat, govern the product yield and heat/mass transfer dynamics. The results demonstrated a strong dependence of the reaction rate on the pyrolysis temperature. Complete MTT conversion was achieved at 500 °C within 9.2 min, whereas lower temperatures (400–425 °C) retained 11.9% and 1.8% of intermediate solids after 60 min. Furthermore, the reaction rate was governed by both the heat supply and reactant concentration, highlighting the intricate coupling between thermal and chemical dynamics. Parallel/tandem reaction pathways were resolved for volatile and solid products, and the heating rate increased (5–50 °C/min), elevating the volatile2 yield (15.4–17.5%) and reducing the volatile1 (33.6–32.1%) and solid2 (11.1–10.4%) yields. An increase in pyrolysis temperature (400–500 °C) increased the concentration of Volatile2 (9.9–17.5%). Endothermic delays prolonged internal temperature equilibration by 79.7% (1.6–7.9 min).