By Vladimir S Kislik I
This product provides entire info on liquid membrane separations, presenting the foundations and purposes of a number of liquid membrane separation processes. A serious research of latest applied sciences and their theoretical history is gifted, in addition as directions for destiny improvement. - presents entire knowledge-based info at the rules and functions of a number of liquid membrane separation techniques. - incorporates a severe research of recent applied sciences released within the final 15 years.
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Extra resources for Liquid Membranes: Principles and Applications in Chemical Separations and Wastewater Treatment
2. Resistance to diffusion in the LM solution layers and membrane pores is not a rate-controlling step, since the overall mass-transfer coefficients on the LM-strip interface of the system are two orders less than that on the feed-LM side. Thus, we can conclude that the interfacial backwardextraction reaction rate is a rate-controlling step of cadmium transport in the system. No. 53 Notes: 1. 5 cm /s) carrier and strip solutions’ flow velocities. 5 cm3/s) feed and strip solutions’ flow velocities.
In general, a process occurring under the influence of diffusional contributions is characterized by an increase of the transport rate as long as the stirring or flowing rate of the phases is increased (Fig. 6, zone A). On the other hand, when the transport rate is close to be independent of the stirring rate it is sometimes possible to assume that the process occurs in a kinetic regime (Fig. 6, zone B). An increase in stirring or flowing rate produces a decrease in thickness of the diffusion films: the relationship is approximately linear.
For feed layer: 8 2 39 JFss >À1 > > > ½ S À < = 6 Fi UF i 7 6 7 kðfeÞi ¼ UFj À ln4 ð48Þ JF 5> > > ½SFðiÀ1Þ À ss > : ; UF i For carrier layers: 8 > > < 2 39 JEss >À1 > = UEj 7 7 J E 5> À ss > ; UEi ½SEi À 6 1 kðef Þi ðor kðerÞi Þ ¼ UEj Æ ln6 4 > 2 > ½SEðiÀ1Þ : ð49Þ where ‘‘plus’’ (positive) is at increasing concentrations versus time, and ‘‘minus’’ (negative) is at decreasing ones. For strip layer: 8 À1 JRss 9 > > ½ S À > > Ri < URj = kðreÞi ¼ URj ln ð50Þ JR > > > : ½SRðiÀ1Þ À ss > ; URj Carrier-Facilitated Coupled Transport Through Liquid Membranes 41 where UFj , UEj , URj are jth flow velocities, JFss , JEss , JRss are fluxes at steady state, ½SFi , ½SEi , ½SRi are concentrations of solute species, sampled at time i, in the feed, carrier, and strip solutions, respectively.
Liquid Membranes: Principles and Applications in Chemical Separations and Wastewater Treatment by Vladimir S Kislik I