Mass Transfer Resistance Analysis ofL-Tryptophan Extraction in an Emulsion Liquid Membrane System

2000 ◽  
Vol 35 (16) ◽  
pp. 2707-2724 ◽  
Author(s):  
XINGRONG LIU ◽  
DONGSHAN LIU
Keyword(s):  
Mass Transfer ◽  
Liquid Membrane ◽  
Membrane System ◽  
Mass Transfer Resistance ◽  
Emulsion Liquid Membrane ◽  
Transfer Resistance ◽  
Resistance Analysis

scholarly journals Emulsion Liquid Membrane for Cadmium Removal: Experimental Results and Model Prediction

2013 ◽  
Vol 65 (4) ◽  
Author(s):  
A. L. Ahmad ◽  
Adhi Kusumastuti ◽  
M. M. H. Shah Buddin ◽  
D. C. J. Derek ◽  
B. S. Ooi
Keyword(s):  
Mass Transfer ◽  
Model Prediction ◽  
Liquid Membrane ◽  
Volume Ratio ◽  
Membrane System ◽  
Extraction Process ◽  
Transfer Model ◽  
Emulsion Liquid Membrane ◽  
Cadmium Removal ◽  
External Phase

A study on mass transfer model for cadmium extraction in emulsion liquid membrane system has been done. Mass transfer in the external phase and emulsion globule, stripping reaction, and diffusion of the complex were taken account into the model. Reaction and chemical equilibrium of the process were also considered. The partial differential equation was numerically solved using MATLAB software. Effect of some parameters such as acid concentration in the external phase, extraction speed, volume ratio of emulsion to feed phase, volume ratio of internal to membrane phase, and initial concentration to the extraction process were investigated and compared to the model. The model prediction can agree very well with the concentration profile of cadmium in each phase.

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 %.

Analysis of Heat and Mass Transfer Between a Desiccant-Air System in a Packed Tower

1987 ◽  
Vol 109 (2) ◽  
pp. 89-93 ◽  
Author(s):  
P. Gandhidasan ◽  
M. Rifat Ullah ◽  
C. F. Kettleborough
Keyword(s):  
Mass Transfer ◽  
Gas Phase ◽  
Heat And Mass Transfer ◽  
Packing Material ◽  
Mass Transfer Resistance ◽  
Liquid Desiccant ◽  
Governing Equations ◽  
Packed Tower ◽  
Transfer Resistance ◽  
Steady State Model

Heat and mass transfer analysis between a desiccant-air contact system in a packed tower has been studied in application to air dehumidification employing liquid desiccant, namely calcium chloride. Ceramic 2 in. Raschig rings are used as the packing material. To predict the tower performance, a steady-state model which considers the heat and mass transfer resistances of the gas phase and the mass transfer resistance of the liquid phase is developed. The governing equations are solved on a digital computer to simulate the performance of the tower. The various parameters such as the effect of liquid concentration and temperature, air temperature and humidity and the rates of flow of air and liquid affecting the tower performance have been discussed.

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