Adiabatic operation of a packed-bed absorber

During absorption in a packed bed, release of energy at the interface due to latent heat and heat of solution raises the interface temperature above that of the bulk liquid. This changes physical properties, mass-transfer coefficients, and equilibrium concentrations. Because of the possibility of substantial temperature effects, there is the possibility that the solvent evaporates in the warm parts of the tower and recon- 

For this problem, therefore, the components are defined as follows  

A = principal transferred solute, present in both gas and liquid phases B = carrier gas, not dissolving in the liquid, present only in the gas 

C = principal liquid solvent can evaporate and condense present in both phases 

Consider material and energy balances over a differential section of the packed tower. The mass and energy fluxes are considered positive in the direction gas to liquid, negative in the opposite direction. Looking at the gas phase solute A and solvent vapor C may transfer, but carrier gas B will not (Ng = 0)  

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