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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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15.3.2 Fickian Binary Liquid Diffusivities

Experimental binary diffusivity data for liquid systems are presented in Table 15-3. The data for proteins in Table 15-3 show that, as expected, the diffusivities are significantly lower than for low molecular weight compounds, and the diffusivity decreases as the molecular weight of the protein increases. Diffusivities (shown for sucrose) decrease in aqueous gels as more solid is added and the gel becomes more viscous. As temperature increases (compare the chlorobenzene-bromobenzene data at the same concentrations or the infinite dilution ethanol-water data), the diffusivity increases. Pressure is not expected to affect liquid diffusivities. Most of the tabulations of liquid diffusivity data in the ...

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