Nonequimolar effects

The second requirement (Eq. 11.5.25) is that the molar latent heats of vaporization of the constituent species be identical. Now, molar latent heats of many compounds are close to one another, but the differences are not zero. Let us examine the effect of such small differences in the latent heats on the interfacial rates of transfer. Example 11.5.1 demonstrates the importance of taking into account nonequimolar effects in distillation. 

The analysis presented in this chapter was based on three crucial assumptions. Namely, mass transfer and reaction kinetics were neglected. Further, constant flow rates were assumed. Although these assumptions are valid in many applications, an extension to finite mass transfer and reaction kinetics as well as variable flow rates seems challenging for future research in this field. As indicated in the last section, finite mass transfer and reaction kinetics may affect the feasible products of integrated reaction separation processes quite significantly. Strong impact can therefore also be expected for the dynamic behavior. The same applies to variable convective flow rates due to nonequimolar reactions. While this effect is not too important... 

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