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김관응,김영수,신창섭 한국안전학회 1998 한국안전학회지 Vol.13 No.4
The evaluation of thermal and pressure hazard of chemicals on the manufacturing, transporting and storaging is important in the chemical industry for safety. In this study, the thermal decomposition characteristics of intermediate of Saccharin were investigated by using Accelerating Rate Calorimeter(ARC) and Differential Scanning Calorimeter(DSC). Experimental results showed that decomposition temperatures in p-TSA were about 280~$318^{\circ}C$ by DSC and $201^{\circ}C$ by ARC. In case of o-TSA were about $336^{\circ}C$~$360.8^{\circ}C$ by DSC and $299^{\circ}C$ by ARC. The decomposition temperature acquired by ARC was about $70^{\circ}C$ lower than that by DSC. The exothermic runaway reaction in case of p-TSA occured in 598 minute and o-TSA in 5 minute. For the safety in the chemical industry, we should consider the ARC data as well as DSC data in the handling and design of process.
김관응,이근원 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.4
아조계 발포제 아조다이카본아미드(azodicarbonamide, ADCA) 입도별 4종(2-3, 6-7, 14-16, 23㎛)에 대해서 시차주사열량계(differential scanning calorimeter, DSC) 및 단열형 열량계인 가속속도열량계(accelerating rate calorimeter, ARC)를 이용하여 열분해특성을 고찰하였다. 본 연구의 실험결과, 시료입도가 작을수록 발열개시온도, 발열최고온도 그리고 발열종료온도 등은 보다 낮은 온도로 이동하였으며 발열량은 증가하는 경향을 나타내었다. DSC와 ARC측정결과를 비교하였을 때, 발열개시온도의 경우 ARC측정값이 DSC측정값 보다 55-65℃ 낮게 측정되었고, 발열량의 경우 ARC측정값이 DSC측정값 보다 135-150㎈/g 높게 측정되었다. 이와 같은 단열효과는 시료입자의 크기가 작아질수록 크게 나타나고 있다. 발열개시온도 및 발열량은 승온 속도가 증가함에 따라 증가하는 경향을 나타내었고, 승온 속도와 발열최고온도로부터 구한 활성화 에너지는 37.29㎉/㏖이였다. The thermal decomposition characteristics of blowing agent azodicarbonamide(ADCA) was investigated by using the differential scanning calorimeter(DSC) and the accelerating rate calorimeter(ARC). Experimental results showed that the exothermic onset temperatures were about 201-206℃ by DSC and 136-151℃ by ARC. The decomposition temperature acquired from ARC was about 55-65℃ lower than that from DSC. Exothermic heats were about 144-150㎈/g by DSC and 274-296㎈/g by ARC. The exothermic onset temperatures were lowered and exothermic heats were increased with decreasing the particle size of ADCA. Exothermic onset temperatures and exothermic heats were increased with increasing the heating rate. The activation energy was about 37.29㎉/㏖, which were obtained from the heating rate and the maximum exothermic temperature.