Time-dependence of pervaporation performance for the separation of ethanol/water mixtures through poly(vinyl alcohol) membrane

Investigation of the fundamental differences between polyamide-imide (PAI) and polyetherimide (PEI) membranes for isopropanol dehydration via pervaporation

“…Similar studies have been conducted on dense flat sheet membranes in previous reports [23][24][25][26] with various findings. However, this paper, for the first time, investigated the effect of feed permeation direction through asymmetric flat sheet pervaporation membranes, and found that the separation with feed solution flowing along the porous side of the membrane had substantially higher pervaporation performance.…”

“…It has been reported that in the flat dense membranes, the hydrophilic-end groups tend to localize at the bottom surface when the membrane was cast on the glass plate [23,24] in order to minimize the interfacial free energy between the membrane and the glass plate. During the asymmetric membrane formation, although the sublayer structure is formed by the solidification of water flowin, the same as the top skin layer, the bottom surface may be more hydrophilic than the top skin surface because the bottom surface contacts the hydrophilic glass plate.…”

Polyvinyl Alcohol-Cellulose Acetate Composite Reverses Osmosis Membranes: I. Synthesis and Characterization

“…Reverse osmosis membranes are prepared by different techniques, amongst micro porous polymeric membrane, which finds many applications in the fields of dehydration of organic mixtures, water treatment and organic-organic separation [10,11]. A most successful process known as pre-evaporation, the dehydration of aqueous-organic mixtures, well established for the dehydration of isopropanol, acetone, tetrahydrofuran, ethylene glycol and methylene chloride [12][13][14].…”

Amino-functionalized poly(vinyl alcohol) membranes for enhanced water permselectivity

“…Therefore, considerable efforts have been devoted to modify those polymeric materials to improve their membrane's performances. The way for the modification of membranes can be roughly categorized into: crosslinking by acids or coupling agents [4][5][6][7][8][9][10][11][12], blending with another polymer or inorganic materials [13][14][15][16], grafting [17][18][19] and incorporation of functional materials [20][21][22]. However, most of the modifications focused on changing the bulk properties of membranes, i.e.…”