Emulsion liquid membranes facilitated transport

The emulsion liquid membrane for cephalosporins relies essentially on facilitated transport. There are basically, however, two types of facilitated transport in emulsion liquid membrane system, i. e.. Type I and Type II facilitation. In the first type, the concentration gradient of the membrane soluble solute/permeate... [Pg.223]

Emulsion liquid membrane extraction of cephalosporins conform to the type II facilitated transport. Here the solute transport is either associated with a cotransport or counter-transport of an anionic species depending on whether ion-pair or ion-exchange extraction is exploited in the ELM system. [Pg.224]

Carrier-facilitated transport is used successfully to extract various organic and inorganic substances from a feed mixture in liquid membranes. Liquid membranes are employed as bulk liquid membranes, emulsion liquid membranes, and supported liquid membranes. [Pg.485]

Liu X and Liu D. Modelling of facilitated transport of phenylalanine by emulsion liquid membranes with di(2-ethyIhexyl)phosphoric acid as a carrier. Sep Sci Technol 1998 33 2597-2608. [Pg.734]

Huang CR, Wang KC, and Zhou DW. Mathematical modelling of carrier-facilitated transport in emulsion liquid membranes. In Bartsch RA, Way JD, eds. Chemical Separations with Liquid Membranes, Washington, DC American Chemical Society, ACS s3miposium series 642, 1996 115-122. [Pg.736]

Substantial work has been done to investigate the use of macro-cyclic polyethers to facilitate the transport of metal ions by Christensen, Izatt and Lamb (56-59). These carriers were incorporated into both bulk liquid and emulsion liquid membranes for the transport of mono- and divalent cations. They have developed a... [Pg.115]

Mathematical Modeling of Carrier-Facilitated Transport in Emulsion Liquid Membranes... [Pg.115]

Carrier-facilitated transport of actinides across bulk, supported, and emulsion liquid membranes, as well as plasticized membranes and recently developed emulsion-free liquid membranes, are reviewed. The discussion includes the effects of important experimental variables upon the solute flux for various types of liquid membranes. Applications of liquid membranes in the recovery and removal of radiotoxic actinides from the nitric acid wastes generated during reprocessing of spent fuel by the PUREX process and wastes produced by other radiochemical operations are surveyed. [Pg.391]

Acetic acid, removal using emulsion liquid membranes, 215 Acrylic acid, use in plasma graft polymerization, 254-268 Acrylic acid grafted membranes, use in facilitated transport, 250-264 Actinide, separation from reprocessing wastes with liquid membranes, 391-406 Acyclic ligands, 167,168/... [Pg.410]

In order to develop the liquid membrane techniques, i.e., emulsion Hquid membrane (ELM), supported liquid membrane (SLM), non-dispersive extraction in hollow fiber membrane (HFM), etc., for practical processes, it is necessary to generate data on equilibrium and kinetics of reactive extraction. Furthermore, a prior demonstration of the phenomena of facilitated transport in a simple liquid membrane system, the so-called bulk liquid membrane (BLM), is thought to be effective. Since discovery by Li [28], the liquid membrane technique has been extensively studied for the separation of metal ion, amino acid, and carboxyHc acid, etc., from dilute aqueous solutions [29]. [Pg.218]