Analysis of heat generated in chemical reactions in chemical production
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Recently, while reviewing the risk analysis of the production process, I came across a statement stating that “the main reaction is an exothermic reaction, with a large amount of heat being released during the reaction.” Are there any relevant **standards, industry guidelines, or academic sources that can quantify how much heat needs to be released during a reaction to be considered a large amount, and to pose a risk of explosion or overpressure? For example, if a reaction releases 2.3 kcal/gmol of heat, is that considered a high risk? Also, is there any risk if the reaction is endothermic? Thank you very much
Hehe, you need to check the heat generated by this reaction to see if it will cause your system to heat up significantly, and whether the accumulated heat will lead to the decomposition, polymerization, or vaporization of the materials within the system. If gas is generated, the heat balance of the system at that moment can be used to determine the amount of vaporization that occurs instantaneously; this allows one to figure out the increase in system pressure resulting from the reaction. By examining the system’s ability to release pressure or withstand such stress, it is possible to determine whether there is a risk of explosion. This is how I understand it; I’m not sure if it’s correct, so please advise me, friends!
The level of reaction risk is determined in accordance with the provisions of the \"Guidelines for Safety Risk Assessment of Fine Chemical Reactions (Trial Version)\\", and there are several key factors taken into consideration: 1. The time it takes for the maximum reaction rate in a runaway reaction to be reached, denoted as TMRad； 2. Adiabatic temperature rise ΔTad ； 3. Maximum technical temperature MTT ； 4. Values such as the maximum temperature that an uncontrolled system can reach, namely MTSR, can be used as a reference. The heat release amount mentioned by the poster does not indicate the level of risk; it is necessary to consider the temperature rise (heat accumulation).