Ion-exchange membranes

Equilibrium and transport properties of ion-exchange electrodialytic membranes before and after their processing in model solution containing dimethylacetamide were investigated in LiCl solutions. Values of the membranes transport structural parameters reflecting structural and kinetic characteristi

The process of desalting of a proline modelling solution by electrodialysis in five- and six-chamber electrodialysis apparatus was investigated. It has been shown that the process effectively proceeded in the six-chamber device. Changes of dry substances and pH of the proline modeling solution and a

Usually, the recovery of metals from ore follows a flow sheet which includes the leaching operation, the filtration and the purification concentration. However, in this work a new processing method is described. It is an electromembrane process where the ore is inserted between two membranes. It is

Two 2D models of non-stationary and non-isothermal transfer of a strong binary electrolyte in a rectangular electrodialysis desalination cell formed by anion- and cation-exchange membranes are developed. Both gravitational and forced convection occurring in underlimiting current mode are taken into

An electrodialysis process was employed to investigate the concentration of formic, acetic and propionic acid solutions under different experimental conditions. In this process interpolymer-type ion-exchange membranes were used due their high chemical stability and durability. The effects of concent

The aim of this study is the determination of the ionic distribution versus the spatial coordinates within the membrane polymers. The confocal Raman spectroscopy is a useful tool for the study because it allows investigation of the species nature within materials. The studied membrane is a AW from S

A mathematical model of the competitive electro-transport of two counter-ions through an ion exchange membrane based on the Nernst-Planck and Poisson equations is developed. A three-layer system is considered: the membrane and two adjacent diffusion layers. Concentration profiles in the three layers

Apart from their stability in various operating conditions, the two main properties of ion-exchange membranes (IEMs) are the conductivity and selectivity, but both are difficult to obtain simultaneously at high values. This presentation deals with different ways of measurements, including specific c

The polymer polarity and density of sulfonated poly (phenylene oxide) (SPPO) membranes were manipulated by exchanging the proton of the sulfonic groups with mono-, di-, and tri-valent metal cations. The performance of the TFC membranes coated with ion-exchanged SPPO, toward the separation of CO2/CH4

It is common practice in electrodialysis demineralization of calcium hydrocarbonate natural waters to restrict the current density by the limiting diffusion one. Exceeding this value causes the irreversible water dissociation at the interface of the anion-exchange membrane and solution and selective