Pyrolysis of bromobenzene by the toluene carrier technique and determination of D(C6H5—Br)

Abstract

The pyrolysis of C6H5Br bas been studied by the toluene carrier technique over the temperature range 1018 to 1126 K using contact times of 1.18 to 2.85 s and total pressures of 3.8 to 4.4 kPa. Percent decomposition based on analyses of residual C6H5Br ranged from 4 to 89%. When HBr was trapped out and quantitatively determined it accounted for more than 95% of the bromine expected. Within the limits of the experimental method the decomposition was found to be homogeneous and first order.[Formula: see text]The Arrhenius equation for reaction [1] is[Formula: see text]Making an approximate correction of the activation energy to 298 K then gives D(C6H5—Br) = 313 ± 5.4 kJ mol−1.