The issue of temperature increase in acid-base neutralization solutions
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The exothermic reaction between ammonia and sulfuric acid was simulated using Aspen’s mixing module and reaction module; the main goal was to find out by how much the solution temperature would increase as a result of this reaction, and why there is such a large difference in the outlet temperatures obtained from these two modules
The difference in using mixing modules and reaction modules in Aspen lies in the fact that mixing modules typically consider only the thermal effects of physical mixing, without taking into account the exothermic reactions. The reaction module includes built-in calculation of the heat effect of chemical reactions. The reaction between ammonia and sulfuric acid is an exothermic reaction; therefore, a higher temperature increase is calculated in the reaction module compared to that in the mixing module. The large difference in discharge temperature between the two is mainly because the reaction module takes into account the heat effect of chemical reactions, whereas the mixing module does not. .