Thermal runaway hazard studies for azobisisobutyronitrile with incompatible substances

• Main Authors: Chun-Hsien Chen, 陳俊憲
• Other Authors: Chi-Min Shu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/40867206829500081830

碩士 === 國立雲林科技大學 === 環境與安全衛生工程系碩士班 === 100 === The azo group –N=N– is gave its name because of a large group of compounds in it. It is widely used as initiator, blowing agent, and organic syntheses under the process of free radical polymerization. Due to intensely exothermic and unstable decomposition, it can occur serious accident by self-reactive or by complex compounds, even without oxygen or air. However, it may not only cause runaway reaction by self-reactive reaction, but also has many potential hazards by incompatible reaction. Through doing the study of thermal hazard and incompatible reaction, we expect to let people pay high attention to this material. In this study, at first, we used differential scanning calorimetry (DSC) to analyze the AIBN thermal critical parameters. According to the thermal analysis by DSC, we can know that onset temperature (T0) is 104 oC and the heat of decomposition (ΔHd) is 1,605 J g－1. In addition, it has two endothermic peaks; the first peak causes crystal chemistry change, then the thermal decomposition reaction will be end immediately by exothermic reaction. Secondly, we used the data from DSC into Kissinger methods to obtain the activation energy (Ea) of AIBN, which is Ea= 141.7 kJ mol–1. The Ea of AIBN will decrease while it mixes with 6N hydrochloric acid, which causes the decomposition of AIBN easily. Thirdly, thermogravimetric analyzer/gas chromatography/mass, (TGA/GC/MS) was used to implement qualitative and quantitative analysis, and the result of TGA showed the initial temperature and final temperature of AIBN is 65–85 oC and approximate 100 oC, correspondingly. At the end, safety parameters, such as TNR, TMR, and SADT, can be used to reference guide for hazard prevention to minimize the cost of hazard.