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Thermal characteristics of lysine tri-isocyanate and its mixture with water

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Bibliographic Details
Title: Thermal characteristics of lysine tri-isocyanate and its mixture with water
Authors: Li, Xin-Rui li@fri.go.jp, Koseki, Hiroshi1, Iwata, Yusaku1
Source: Journal of Hazardous Materials. Apr2007, Vol. 142 Issue 3, p647-652. 6p.
Subjects: Lysine, Isocyanates, Calorimetry, Effect of temperature on chemical kinetics, Chemical reactions, Carbon dioxide, Gas chromatography, Fourier transform infrared spectroscopy, Safety
Abstract: The thermal reactivity of lysine tri-isocyanate (LTI, 2-isocyanatoethyl-2,6-diisocyanato caproylate) and its mixture with 1% water was investigated after the occurrence of a runaway reaction at a plant. By using a sensitive thermal calorimeter, C80, and an adiabatic calorimeter, ARC, an onset reaction of LTI was observed at 70–100°C and it became vigorous at 175–200°C. The reaction is considered as co-polymerization at this stage, which causes a second decomposition reaction at 200°C if the heat generation is accumulated in the vessel. On the other hand, the presence of water can catalyze LTI at much lower onset temperature and lead to a moderate reaction at 50°C since carbamine is produced and in turn it induces decarbonization of the LTI molecule with significant release of CO2 gas which was detected by a gas chromatography and an FT-IR gas analyzer. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:The thermal reactivity of lysine tri-isocyanate (LTI, 2-isocyanatoethyl-2,6-diisocyanato caproylate) and its mixture with 1% water was investigated after the occurrence of a runaway reaction at a plant. By using a sensitive thermal calorimeter, C80, and an adiabatic calorimeter, ARC, an onset reaction of LTI was observed at 70–100°C and it became vigorous at 175–200°C. The reaction is considered as co-polymerization at this stage, which causes a second decomposition reaction at 200°C if the heat generation is accumulated in the vessel. On the other hand, the presence of water can catalyze LTI at much lower onset temperature and lead to a moderate reaction at 50°C since carbamine is produced and in turn it induces decarbonization of the LTI molecule with significant release of CO2 gas which was detected by a gas chromatography and an FT-IR gas analyzer. [Copyright &y& Elsevier]
ISSN:03043894
DOI:10.1016/j.jhazmat.2006.06.085