Thermal, Kinetic and Safety Aspects of a Thermally In-Stable Reaction Mixture: Mastering the Thermal Runaway Situations
Keywords:Hazards evaluation, risk assessment.
This article reports to the hazard evaluation studies of a laboratory scale reaction involving 1, 3-diethyl propanedioate and Fuming Nitric acid to form diethyl 2-nitropropanedioate. The process has been optimized and scheduled to the pilot scale batches after process safety evaluation. Fuming Nitric acid addition to 1,3-Diethyl propanedioate at 7°C is highly exothermic reaction with an adiabatic-temperature-rise of 113°C according for RC1e experiment. But the mixture strongly shows an exothermic event at an onset temperature of 60°C to a maximum temperature of 538°C within few seconds with a massive pressure rise in ARC experiment. Indeed, these hazard evaluation experimental results are clear to understand the hazards of the reaction in case of failing in controlled addition, which helped us to redesign the laboratory scale process and notified the required control measures at plant scale.
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