Activity coefficients absorption

The selectivities, at infinite dilution are usually used for the selection of selective solvents. These values can be calculated from activity coefficients at infinite dilution (extractive distillation, extraction) or from Henry coefficients (absorption). 

Area, constant, optical absorption Activity, absorption coefficient Debye length Cyclic voltammogram Capacitance / j,F Double layer capacity / 0.F Differential double layer capacity Integral double layer capacity Concentration / M Surface concentration Bulk concentration / M Diffusion coefficient / cm s ... 

The absorptive active region (for MWIR and LWIR devices typically fabricated from a narrow-bandgap material, its thickness d and the absorption coefficient a) is positioned between two layers of wider-bandgap material (thickness Li and and the absorption coefficient of both layers ttex). DBR mirrors are on the top and the bottom side. In some cases the top Bragg mirror does not exist, and its role is assumed by the interface between semiconductor and the incident medium (air), which furnishes a top surface reflection coefficient of about 30 % [251]. 

Figure 5-29. Effect of Catacarb catalyst concentration on relative solution activity for CO2 absorption. Activities are based on observed overall liquid film absorption coefficient [Eickmeyer, 1962j. Reprinted widi permission from Chemicai Engineering Progress, copyright 1962, American institute of Chemicai Engineering...

Henry s law is useful for handling equiUbria associated with gas absorption (qv) and stripping problems. Henry s law coefficients are useful for estimating terminal activity coefficients and have been tabulated for many compounds in dilute aqueous solutions (27). 

The reaction was followed by means of the strong absorption of the Os(II) complex at 480 m/i. Unlike the Tl(riI) + Fe(II) system, there is a slight increase in rate as the hydrogen-ion concentration is increased. The kinetic data were interpreted on the basis that both Tl and TIOH react with Os(bipy)3 (with rate coefficients and respectively). At 24.5 °C and ju = 2.99 M, kj = 36.0 l.mole. see and= 14.7 l.mole sec corresponding activation energies are 6.90 and 11.5 kcal.mole" The latter values are considerably smaller than those for the T1(III) + T1(I) exchange and for the Tl(III)- -Fe(II) reaction . On the other hand, all three reactions are subject to retardation by Cl ions. 

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