Analysis of liquid membrane extraction of binary Zn(II) and Cd(II) from chloride media with Aliquat 336 based on thermodynamic equilibrium models

Publisher Summary Liquid pertraction or liquid membranes appeared as a new and prospective separation method relatively recently. Due to its advantages over solid membranes and liquid-liquid extraction, liquid pertraction attracted the attention of many scientists and engineers. Liquid pertraction reflects the transfer process involved as well as the mulfi-(three) phase structure of the system. The term "liquid membranes" also represents the essential feature of the process, but the conventional image of a membrane—a thin, solid (in this case also semipermeable) barrier—could hardly be adapted to the multiple emulsions for which the term was actually introduced. It explores a very simple idea: two homogeneous, completely miscible liquids, which may be referred to as donor solution (F), and an acceptor solution (R) are spatially separated by a third liquid, immiscible and practically insoluble in the former two liquids—the membrane phase (S). Liquid membranes have two considerable advantages over solid membranes: as is known, molecular diffusion in the liquids (except in super-viscous ones) is, by several orders of magnitude, faster than that in solids.

Chapter 7 Liquid membranes (liquid pertraction)

Transport of zinc through a supported liquid membrane using di(2-ethylhexyl) phosphoric acid as a mobile carrier

The calculation of permeation rates through supported liquid membranes based on the kinetics of liquid-liquid extraction

https://ris.utwente.nl/ws/files/6771700/Neplenbroek92nitrate.pdf

Nitrate removal using supported liquid membranes: transport mechanism

The permeation mechanism has been studied to obtain fundamental information for developing liquid membrane process. Chloride ion was concentrated across a diaphragm-type liquid membrane impregnated with Amberlite LA-II as a mobile carrier. This process is considered to constitute a kind of active transport process. The permeation rates of chloride ion are explained approximately by a permeation model in which hydrochloric acid reacts with the carrier at the interface of one side of the membrane and the complex formed by the reaction then diffuses through the membrane and further reacts with sodium hydroxide in the vicinity of the opposite interface.

Yoshio Tamura

Papers

Mechanism of chloride ion transport through diaphragm-type liquid membrane