Kinetics of the decomposition of dimethylhexane-1,6-dicarbamate to 1,6-hexamethylene diisocyanate

The kinetics of the decomposition of dimethylhexane-1,6-dicarbamate to 1,6-hexamethylene diisocyanate was studied. A consecutive reaction model was established and the reaction orders for the two steps were confirmed to be 1 and 1.3 by the integral test method and the numerical differential method, respectively. The activation energies of the two steps were (56.94 +/- 5.90) kJ center dot mol(-1) and (72.07 +/- 3.47) kJ center dot mol(-1) with the frequency factors exp(12.53 +/- 1.42) min(-1) and (14.254 +/- 0.84) mol(-0.33) center dot L-0.33 center dot min(-1), respectively. Based on the kinetic model obtained, the progress of the reaction can be calculated under given conditions. (C) 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.