Mass Transfer and Diffusion

Chapter3 mass Transfer and Diffusionbarriers, such as membranes, differing species mass -transferrates through the membrane govern equipment a binary mixture, molecular Diffusion of componentAwith respect to B occurs because of different potentialsor driving forces, which include differences (gradients)of concentration (ordinary Diffusion ), pressure (pressurediffusion), temperature (thermal Diffusion ), and external forcefields (forced Diffusion ) that act unequally on the differentchemical species present. Pressure Diffusion requires a largepressure gradient, which is achieved for gas mixtures with acentrifuge. Thermal Diffusion columns or cascades can beemployed to separate liquid and gas mixtures by establishingatemperature gradient. More widely applied is forceddiffusion in an electrical field, to cause ions of differentcharges to move in different directions at different this chapter, only molecular Diffusion caused byconcentration gradients is considered, because this is themost common type of molecular Diffusion in separationprocesses.

Mass Transfer and Diffusion barriers, such as membranes, differing species mass-transfer rates through the membrane govern equipment design. In a binary mixture, molecular diffusion of component A with respect to B occurs because of different potentials or driving forces, which include differences (gradients)

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  Transfer, Through, Mass, Membrane, Diffusion, Mass transfer

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