Addition by portions

This mode of addition is a traditional way of limiting the accumulation. It is also used for practical reasons, when a reactant is delivered in drums or containers. Nevertheless, the amount of reactant, which can be added in one portion, can also be limited for safety reasons. In this case, the addition must be controlled by the conversion that is, the next portion is only added if the previous portion has been consumed by the reaction. Different criteria can be used to follow the reaction the temperature, the gas evolution (where applicable), the aspect of the reaction mass, chemical analysis, and so on. For a well designed process, where the reaction kinetics are known to a certain accuracy, the successive additions can also be performed on a time basis. 

Worked Example 7.3 Slow Reaction with Different Feed Rates 

Calculate the heat release rate of the reaction performed at industrial scale with the same reactor as described in Worked Example 7.2. 

Calculate the MTSR from these data and compare it to the characteristic temperatures of the decomposition reaction (Table 5.4). What are the conclusions  

The maximum heat release rate is reached at the same time of 0.5 hours. The heat release rate at industrial scale is calculated using the same method as previously  

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