Calorimetric study of the inhibition of runaway reactions during methylmethacrylate polymerization processes |
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| Institution: | 1. Dipartimento di Chimica Industriale e Ingegneria dei Materiali, Università di Messina, Salita Sperone, 31, I98166 Sant’Agata di Messina, Italy;2. Dipartimento di Processi ed Impianti di Ingegneria Chimica “I. Sorgato”, University of Padova, via Marzolo, 9 – 35131 Padova, Italy;1. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, College of Safety Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Department of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan;3. Department of Ammunition Engineering and Explosion Technology, School of Chemical Engineering, Anhui University of Science and Technology, Anhui 232001, China;1. Mechanical Engineering Department, Colorado School of Mines, Golden, CO 80401, USA;2. Chemical and Biological Engineering Department, Colorado School of Mines, Golden, CO 80401, USA;1. Safety Engineering Institute, Nanjing Tech University, Nanjing 210009, Jiangsu, China;2. Jiangsu Key Laboratory of Dangerous Chemical Safety and Control, Nanjing 210009, Jiangsu, China |
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| Abstract: | Reaction inhibition was adopted as a method to halt runaway phenomena during polymerization experiments. Use of reaction calorimetry coupled with a particular system for early detection of the onset of runaway (early warning detection system) has allowed to investigate the behaviour of two substances that can influence the reaction rate: hydroquinone and 1,4-benzoquinone. The process studied was the free-radical polymerization of methylmethacrylate carried out under batch conditions in bulk or in emulsion. The results show that hydroquinone and 1,4-benzoquinone behave differently: the first is an inhibitor because it completely stops the process; the second behaves as a retarder and could be used industrially to control the process and keep the reactor temperature within safe limits. |
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