Sorption number

Fig. 24. Change of equatorial X-ray diffraction pattern of iodinated PVA films with iodine sorption Number in a mol/1 unit correspond to the iodine concentration in soaking solution (fl) 0 mol/1, (b) 2 x 10 2 mol/1, (c) 1 x 10 "1 mol/1, (d) 4 x 10 1 mol/1...

Henzler (1982) was able to correlate the same experimental results by using the dimensionless group Y = (kLaL/v)(ul/g)113 as ordinate and X = PJ(Vpgv) as abscissa. The dimensionless group Y represents the sorption number for bubble columns, while X represents the ratio of the mechanical power of the stirrer to the hydraulic power of the gas throughput. The sorption number Y also allows comparison between mixing tanks and bubble columns (Henzler... 

The mass-transfer coefficient, kL, or in the dimensionless form, the sorption number... 

Starting from the definition relationship for the sorption number Y ... 

Tab. 4.3 Dependence of sorption number Y upon terminal gas bubble diameter d.

Fig. 4.42 Dependence of the sorption number 10 Zacc. (4.111) upon normal gas throughput qn g for different spargers (pipe and dome aerators) and for Kenics aerator ( ) from [629] 8...

Finally it is interesting to learn, which values of the sorption characteristic Y the proposed gas/liquid contacting devices attain in comparison with gas bubbles of a particular size dt, which individually emerge from a borehole. This comparison is presented in Table 4.4 and shows that the bubbles in the swarm have a terminal bubble size of dt > 2 mm. A sorption number value achieved with the slot injector... 

Tab. 4.4 Sorption numbers Tas a function of the terminal bubble size dt (Tab. 4.3) in comparison with the Tvalues achievable with conventional aeration devices...

Figure 190. A log-log plot of sorption number (S into a PVC container versus octanol-water partition coefficient (PWmd) for a number of drugs. Drugs were stored at 15-20°Cfor 1, ( ) and 24 h ( ). (Reproduced from Ref. 750 with permission.)...

Zlokarnik (3,55) recommends a slot injector for the aeration of waste water. This two-phase nozzle of injector type is outlined in Fig. 12. Zlokarnik has also reported on detailed mass transfer measurements, i.e. kj a values. The results are represented by introducing a dimensionless sorption number Y which is defined by... 

The sorption number Y introduced by Zlokarnik (3) and defined by eq. (25) presents a reasoneible measure to characterize mass transfer properties of tower bioreactors. Table 1 summarizes experimental studies in bubble columns of various geometry and gives sorption numbers calculated for Uq = 5 cm/s. Besides physico-chemical properties it is particularly the gas distributor which affects the... 

TABLE 1 Typical experimental values of sorption number for various ooluims (evcduated for u = 5 aVsI... 

Gas sparger(mean orifice or pore diameter in mn) Column d c / cxn sizes L, cm Liquid system Sorption number 105 Y Reference... 

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