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Molecules 2017, 22(12), 2219;

Evaluation on the Photosensitivity of 2,2′-Azobis(2,4-Dimethyl)Valeronitrile with UV

Shaanxi Key Laboratory of Prevention and Control of Coal Fire, School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
Author to whom correspondence should be addressed.
Received: 3 November 2017 / Revised: 6 December 2017 / Accepted: 12 December 2017 / Published: 14 December 2017
(This article belongs to the Section Analytical Chemistry)
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Azo compounds have high exothermic characteristics and low thermal stability, which have caused many serious thermal accidents around the world. In general, different locations (e.g., equatorial or polar regions) have different UV intensities. If the azo compound exists in an inappropriately stored or transported condition, the decrease in thermal stability may cause a thermal hazard or ageing. 2,2′-Azobis(2,4-dimethyl)valeronitrile (ADVN) is investigated with respect to the thermal stability affected by UV exposure at 0, 6, 12, and 24 h. When ADVN is exposed to 24 h of UV (100 mW/m2 and 254 nm), T0 is not only advanced, but the mass loss is also increased during the main decomposition stage. In addition, the apparent activation energy and integral procedural decomposition temperature (IPDT) of ADVN exposed to 24 h of UV is calculated by kinetic models. Therefore, the prevention mechanism, thermal characteristics, and kinetic parameters are established in our study. We should isolate UV contacting ADVN under any situations, avoiding ADVN being aged or leading to thermal runaway. This study provided significant information for a safer process under changing UV exposure times for ADVN. Furthermore, the research method may serve as an important benchmark for handling potentially hazardous chemicals, such as azo compounds described herein. View Full-Text
Keywords: azo compound; free initiator; calorimetric and product analysis technology; kinetic parameters; environmental protection azo compound; free initiator; calorimetric and product analysis technology; kinetic parameters; environmental protection

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Yang, Y.; Tsai, Y.-T. Evaluation on the Photosensitivity of 2,2′-Azobis(2,4-Dimethyl)Valeronitrile with UV. Molecules 2017, 22, 2219.

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