Kinetics of Ion Transport by Macrocyclic Carriers in Liquid Membrane Systems

1988 ◽  
Vol 18 (1-3) ◽  
pp. 63-68 ◽  
Author(s):  
Shoichiro Yoshida ◽  
Tadashi Watanabe
Keyword(s):  
Ion Transport ◽  
Liquid Membrane ◽  
Membrane Systems ◽  
Kinetics Of

scholarly journals Kinetic Model for Solute Diffusion in Liquid Membrane Systems

2016 ◽  
Vol 13 (2) ◽  
pp. 48-57
Author(s):  
Baghdad Science Journal
Keyword(s):  
Mathematical Model ◽  
Kinetic Model ◽  
Solute Transport ◽  
Liquid Membrane ◽  
Solute Diffusion ◽  
Membrane Systems ◽  
Linear Forms ◽  
Donor Acceptor ◽  
Reversible Processes ◽  
Kinetics Of

In this study, a mathematical model for the kinetics of solute transport in liquid membrane systems (LMSs) has been formulated. This model merged the mechanisms of consecutive and reversible processes with a “semi-derived” diffusion expression, resulting in equations that describe solute concentrations in the three sections (donor, acceptor and membrane). These equations have been refined into linear forms, which are satisfying in the special conditions for simplification obtaining the important kinetic constants of the process experimentally.

Liquid Membrane Systems

2018 ◽  
pp. 163-172
Author(s):  
J. W. Frankenfeld ◽  
N. N. Li
Keyword(s):  
Liquid Membrane ◽  
Membrane Systems

Heavy metals removal from wastewaters of phosphoric acid production: a comparison of hybrid liquid membrane (HLM) and aqueous hybrid liquid membrane (AHLM) technologies

2001 ◽  
Vol 1 (5-6) ◽  
pp. 119-129 ◽  
Author(s):  
V. Kislik ◽  
A. Eyal
Keyword(s):  
Heavy Metals ◽  
Phosphoric Acid ◽  
Cation Exchange ◽  
Liquid Membrane ◽  
Membrane Resistance ◽  
Water Soluble ◽  
Separation System ◽  
Membrane Systems ◽  
Membrane Pore ◽  
Cyanex 302

Selective removal of heavy metal ions from industrial wet-process phosphoric acid (WPA) was studied, using the two liquid membrane systems: Hybrid Liquid Membrane (HLM) and Aqueous Hybrid Liquid Membrane (AHLM). Monothiophosphinic acid (Cyanex 302) in kerosene (for the HLM) and Polyvinylsulfonic acid (PVSA) aqueous solution (for the AHLM) were used as a liquid membrane (LM), separated from the feed and strip streams by neutral or cation-exchange membranes. On application of the HLM separation system, the permeation from the feed to the strip phase followed the selectivity sequence: Zn >> Cd > Cu with all types of membranes used. Results show that the selective separation of Cd and Zn from the WPA may be achieved by the HLM with cation-exchange membranes, using a single set-up installation at continuous processing. Copper is accumulated in the Cyanex 302, poisoning the carrier. So, this carrier and HCl as a strip solution can not be recommended for the HLM processing of WPA. Using the AHLM separation system, heavy metals such as cadmium and copper, were successfully recovered from the WPA: average fluxes (in mol/m2sec) to the strip phase were 3.7 × 10-7 and 6.7 × 10-7. Satisfactory dynamic selectivity to copper (≈16) was found. The transfer of iron and zinc species to the strip phase was below detection levels during the 144 hrs of the AHLM experiment. Contamination of the feed and strip solutions by PVSA was not observed during the 500 hrs of processing. The membranes were completely regenerable and used repeatedly. In comparison with the HLM and other liquid membrane systems, the AHLM can potentially provide many operational, economic and environmental advantages, some of them being higher transport rates, low carrier losses and low contamination of the feed and strip solutions by water-soluble polymers, long membrane lifetime, ambient temperature, low energy requirements and chemical consumption, no special requirements for membrane resistance in organic solvents, and fewer limitations on the variability of membrane pore sizes, etc.

scholarly journals Detection of L-Proline-Catalyzed Michael Addition Reaction in Model Biomembrane

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Masanori Hirose ◽  
Shigenori Sugisaki ◽  
Keishi Suga ◽  
Hiroshi Umakoshi
Keyword(s):  
Michael Addition ◽  
Reaction Rate ◽  
Phase State ◽  
Addition Reaction ◽  
Michael Addition Reaction ◽  
Membrane Systems ◽  
Liposome Membrane ◽  
Reaction Rate Constants ◽  
Plausible Model ◽  
Kinetics Of

A method to detect the L-proline- (L-Pro-) catalyzed Michael addition reaction in model biomembranes has been established, using N-[p(2-benzimidazolyl)phenyl]maleimide and acetone as reactants. The effect of liposome membranes on this reaction was kinetically analyzed using fluorescence spectroscopy. The kinetics of the reaction were different from those of the constituent lipids of the liposomes. Zwitterionic 1,2-dipalmitoyl-sn-glycero-3-phosphocholine liposome, which is in the solid-ordered phase, had a better value of reaction rate, suggesting that the reaction rate constants of this reaction in liposome membrane systems could be regulated by the characteristics of the liposome membrane (i.e., the phase state and surface charge). Based on the results obtained, a plausible model of the L-Pro-catalyzed Michael addition reaction was discussed. The obtained results provide us with an easily detectable method to assess the reactivity of L-Pro in biological systems.

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