Characteristics of Heat Release Measured by Automatic Pressure Tracking Adiabatic Calorimeter

摘要

An automatic pressure tracking adiabatic calorimeter (APTAC) had been developed to obtain the thermokinetic and vapor pressure data during runaway reactions. The APTAC is an adiabatic calorimeter with a large- scale sample mass and low thermal inertia, and is an extremely useful tool for assessing thermal hazards of reactive chemicals. The data obtained by the APTAC is important information for the design of the safe industrial process. The main characteristic of APTAC is that the temperature inside the sample is measured. However, the APTAC is not so widely used in the field of the chemical reactivity evaluation. The apparatus properties and the reliability of the data obtained by the APTAC are examined on the basis of the experimental data. In addition, the reaction of DTBP is studied on the basis of the measurement data. A reaction can be followed adiabatically up to at least 400 K/min on the basis of the heat rate data of di-tert-butyl peroxide (DTBP)/toluene solution with various weighs and concentrations. The activation energy of DTBP decomposition is nearly the same as the literature values. The pressure behavior is measured by the APTAC. The heat rate is also important data for estimating the thermal hazardous materials. The pressure rate is important data for designing the relief vent of a reactor. The relationship between the pressure rate and the heat rate is investigated to predict the pressure rate on the basis of the heat rate data. The measurement results of the APTAC and the analytical methods obtained in this paper will be important for estimating the pressure rise.