Science and Technology of Energetic Materials

Vol.66, No.5 (2005)Special Issue for ISEM 2005


Risk evaluation by pressure rise measured using adiabatic calorimeter
Yusaku Iwata and Hiroshi Koseki


An automatic pressure tracking adiabatic calorimeter (APTAC) had been developed to obtain the thermokinetic and the vapor pressure data during runaway reactions. It is important to conduct a risk evaluation using the heat rate and the pressure rate in decomposition in order to handle chemical material safely. The APTAC is an adiabatic calorimeter with a large-scale sample weight and low thermal inertia. Pressure is generated outside the sample cell to cancel the pressure difference during a reaction. The APTAC is a useful tool for assessing thermal hazards of reactive chemicals. The data obtained by the APTAC is important information for the design for the safe industrial process. The pressure data is one of the necessary parameters to design a reactor and a safety vent. However, the data by the APTAC is not familiar because there are few measurement examples and papers regarding the APTAC.

The data of di-tert-butyl peroxide (DTBP)/toluene solutions are collected by the APTAC. The relationship between the sample weight and the pressure rise is examined. The influence of the DTBP concentration on the pressure and the pressure rate is investigated. The reasonable method to evaluate the intensity of the decomposition is derived on the base of the pressure rate data.

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Thermal decomposition, Automatic pressure tracking adiabatic calorimeter, Pressure, Pressure rate

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