Effect of Mass Transfer Resistance of Polymeric Surfactant on Transport of Metal through Bulk Liquid Membrane Interface

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Diptendu Das
Keyword(s):  
Mass Transfer ◽  
Liquid Membrane ◽  
Bulk Liquid ◽  
Polymeric Surfactant ◽  
Mass Transfer Resistance ◽  
Membrane Interface ◽  
Bulk Liquid Membrane ◽  
Transfer Resistance

New bulk liquid membrane oscillator composed of two coupled oscillators with diffusion-mediated physical coupling

2015 ◽  
Vol 69 (9) ◽  
Author(s):  
Maria Szpakowska ◽  
Elżbieta Płocharska-Jankowska ◽  
Ottó B. Nagy
Keyword(s):  
Mass Transfer ◽  
Intercellular Communication ◽  
Coupled Oscillators ◽  
Liquid Membrane ◽  
Membrane System ◽  
Bulk Liquid ◽  
Bulk Liquid Membrane ◽  
New Type ◽  
Membrane Oscillator ◽  
Acceptor Phase

AbstractA new type of bulk liquid membrane system, which represents the first example of a bulk liquid membrane oscillator characterised by the presence of two coupled oscillators, is described. When the benzyldimethyltetradecylammonium chloride surfactant undergoes an oscillatory mass transfer through a nitromethane liquid membrane, a new liquid layer (phase X) appears between the membrane and the acceptor phase. Kinetic analysis provides evidence that the whole system is composed of two coupled oscillators with diffusion-mediated physical coupling. The first component oscillator (based on nitromethane) of lower frequency delivers the driving material to the second one (phase X-based oscillator) leading to additional higher frequency oscillations. A new molecular mechanism is proposed for interpreting the experimental observations. The results might enhance understanding of intercellular communication in biology, where periodic signalling is more efficient than any other type of signalling mode.

CO2 Absorption/Desorption on Gas-Liquid Membrane Contactors Using Monoethanolamine Solvent: Comparison of Porous and Composite Hollow Fibers

2020 ◽  
Vol 869 ◽  
pp. 321-335
Author(s):  
Margarita I. Kostyanaya ◽  
Eduard G. Novitskii ◽  
Stepan D. Bazhenov
Keyword(s):  
Mass Transfer ◽  
Liquid Membrane ◽  
Hollow Fiber Membrane ◽  
Composite Membranes ◽  
Operating Efficiency ◽  
Mass Transfer Resistance ◽  
Transfer Resistance ◽  
Solvent Vapor ◽  
Selective Layer ◽  
Membrane Contactors

The operating efficiency of asymmetric porous and composite membranes with a thin non-porous selective layer was compared in the processes of CO2 absorption and desorption in gas-liquid membrane contactors using aqueous solutions of monoethanolamine (MEA) with low concentration (<14 %). Composite membranes were prepared by direct deposition of poly (1-trimethylsilyl-1-propyne) (PTMSP) in a hollow fiber membrane module. The effects of gas flow rate and MEA solvent linear velocity on the CO2 mass transfer were evaluated. Porous membranes were shown to be more effective in the process of CO2 absorption, because they allow to remove more than 90 % of CO2 from the gas mixture during one pass of the solvent through the contactor. Composite membranes were more promising for CO2 desorption, since they provide half as much of the solvent vapor losses with comparable desorbed CO2 fluxes (0.12-(STP)/(m2·h)). The contributions of membrane and liquid phase to the overall mass transfer resistance during the CO2 absorption process were estimated. It was demonstrated that deposition of a thin selective layer from a highly permeable PTMSP with a thickness of only 3 μm increases the membrane contribution to the total mass transfer resistance from 10-20 % to 60-80 %.

scholarly journals Liquid-liquid extraction and facilitated membrane transport of Pb2+ using a lipophilic acridono-crown ether as carrier

2020 ◽  
Vol 99 (1-2) ◽  
pp. 117-129
Author(s):  
Ádám Golcs ◽  
László Bezúr ◽  
Péter Huszthy ◽  
Tünde Tóth
Keyword(s):  
Membrane Transport ◽  
Metal Ion ◽  
Liquid Membrane ◽  
Competitive Inhibition ◽  
Liquid Extraction ◽  
Bulk Liquid ◽  
Bulk Liquid Membrane ◽  
Liquid Liquid Extraction ◽  
Component Systems ◽  
Source Phase

AbstractStudies on liquid-liquid extraction and bulk liquid membrane (BLM) technique-based metal ion separation by a previously published Pb2+-selective acridono-18-crown-6 ether selector molecule were performed. The effects of the stirring speed, the quality of apolar organic membrane, the counterions of Pb2+, the pH of the aqueous phase, the concentration of the source phase, the concentration of the carrier in the BLM and the temperature on the Pb2+-separation were investigated. Moreover, the effects of the competitive inhibition due to the presence of Ag+, Ca2+, Co2+, Cu2+, K+, Mg2+, Na+ and Zn2+ as competing ions in a multicomponent aqueous source phase of different ion-concentrations were also studied. After a proper dilution of the multicomponent aqueous source phase, excellent Pb2+-selectivity was achieved without a significant reduction in the efficiency compared to the liquid membrane transport of single-component systems. Based on the BLM-cell studies the applied selector molecule proved to be suitable for the development of liquid membrane-based Pb2+-selective separation methods, which can be greatly aided by the analysis of the effects on the separation and by the optimization of the parameters of the process discussed here.

Kinetic study of chromium(VI) facilitated transport through a bulk liquid membrane using tri-n-butyl phosphate as carrier

2009 ◽  
Vol 150 (1) ◽  
pp. 83-89 ◽  
Author(s):  
Weidong Zhang ◽  
Junteng Liu ◽  
Zhongqi Ren ◽  
Shuguang Wang ◽  
Changshun Du ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Liquid Membrane ◽  
Facilitated Transport ◽  
Bulk Liquid ◽  
Bulk Liquid Membrane ◽  
Chromium Vi
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