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The reactions of OH radicals with toluene diisocyanate, toluenediamine and methylenedianiline under simulated atmospheric conditions

✍ Scribed by K.H. Becker; V. Bastian; Th. Klein

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
666 KB
Volume
45
Category
Article
ISSN
1010-6030

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✦ Synopsis

The reactions of OH radicals with vaporized toluene diisocyanate (TDI), toluenediamine (2,4-and 2,6-TDA) and methylenedianiline (MDA) in synthetic air were studied in a 420 1 photoreactor at ambient pressure and temperature (298 + 2 K) by in situ long-path Fourier transform IR absorption spectroscopy, using a competitive rate technique. Rate constants of 27.4, 190 + 70, 2100 and 30 f 10 (units: lo-l2 cm3 s-l) were determined for TDI, 2,4-TDA, 2,6-TDA and MDA respectively. These data show that under atmospheric conditions the (half) lifetimes for OH radical reactions, with lo6 OH cmA3 as the mean concentration, range from 26 h for TDI to 1 h for 2,4-TDA.

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