MTChemRxns

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Chapter 15 Mass transfer with chemical reactions (Material presented in this chapter are based on those in Chapter 16, ”Diffusion mass transfer in fluid systems” second edition by EL Cussler and Chapter 14, ”Fundamental of heat and mass transfer”, second edition by Incropera and DeWitt)

The liquid-phase mass transport across interface depends on the diffusion of the solute in the liquid phase. The diffusion of the solute depends on the chemical reaction, if any involving the solute in the interface. There are several examples in which simultaneous mass transport between two phases and chemical reactions are involved. For example, several polymerization reactions occur in emulsions, which consist of two liquid phases. One of the reactants is usually in a phase in which the reaction does not occur. Thus, the reactant has to cross the interface and react in another phase. Chemical reaction under certain conditions strongly influence the diffusion. This influence depends on whether the reaction is homogeneous or heterogeneous. In this chapter, mass transport during homogeneous chemical reactions will be characterized. The expressions for the coefficient with chemical reactions will be compared with those without chemical reactions. 191


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