Thermal characteristics of lysine tri-isocyanate and its mixture with water.
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 degrees C and it became vigorous at 175-200 degrees C. The reaction is considered as co-polymerization at this stage, which causes a second decomposition reaction at 200 degrees 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 degrees 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.
Li
Xin-Rui
XR
National Research Institute of Fire and Disaster, 4-1 Nakahara 3-Chome, Mitaka-Shi, Tokyo 181-8633, Japan. li@fri.go.jp
Koseki
Hiroshi
H
Iwata
Yusaku
Y
D002151:Calorimetry; D002219:Carbamates / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry; D002384:Catalysis; D002617:Chemical Industry; D002849:Chromatography, Gas; D005107:Explosions; D005740:Gases; D017953:Isocyanates / Q000737:chemistry*; D007700:Kinetics; D008239:Lysine / Q000031:analogs & derivatives* / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014867:Water / Q000737:chemistry*
D002219:Carbamates; D005740:Gases; D017953:Isocyanates; D011108:Polymers; C521572:lysine triisocyanate; D014867:Water; D002245:Carbon Dioxide; D008239:Lysine