Redesigning the rotating-bomb combustion calorimeter

In order to obtain reliable data of the standard enthalpy of combustion of compounds containing sulfur or halogen atoms, a new calorimetric rotating-bomb system has been set up. Around a platinum lining Parr 1004 C combustion bomb, an isoperibolic calorimeter has been designed, constructed and tested. The calorimeter was calibrated by using standard benzoic acid and the resulting equivalent in energy was ε(calor) = (14321.2 ± 2.4) J · K−1. Combustion measurements using thianthrene were made in order to verify the accuracy of the device, leading to the value of Δcu∘=-(33462.9±5.7)J·g-1, in agreement with the recommended one.