Chemical reactions heat of reaction

In the case of reactive distillation, the MESH equations also have to account for chemical reaction (heat of reaction, change of the mole numbers by chemical reaction). 

Adding heat to a sample can also have an effect that does not increase the temperature. This heat is called a latent heat. It has its origin in a change of the structure of the sample as in a chemical reaction (heat of reaction) or a phase transition (heat of transition). The measurement of a latent heat is done by direct calorimetry as described in Chap. 4. Note that the latent heat is only the heat of reaction or transition if temperature, T, is constant if not, heat capacity effects must be considered separately. 

Energy associated with chemical reaction (heat of reaction), which may be exothermic, when heat is released, or endothermic, when heat is adsorbed. 

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