Solution-Diffusion for Liquid Mixtures

If the mass-transfer resistances in the two fluid films are negligible, 

A dilute solution of solute A in solvent B flows through a tubular-membrane separator where the feed flows through the tubes. At a certain location, the solute concentra- 

The permeability of the membrane is expressed in terms of barrer. The barrer unit is named for R. M. Barrer, who published an early article on the nature of diffusion in a membrane, followed by a widely referenced monograph on diffusion in and through solids (Barrer, 1934, 1951). A barrer is defined as  

Notice that, in this case, the membrane resistance is (137/157.8) x 100 = 87% of the total. 

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