High performance dual-layer hollow fiber fabricated via novel immiscibility induced phase separation (I2PS) process for dehydration of ethanol

Photocatalytic degradation of nonylphenol by immobilized TiO2 in dual layer hollow fibre membranes

“…Various studies clearly reveal the applicability of dual layer fibre spinning technology for various gas [9][10][11][12][13] and liquid separations applications [14][15][16][17]. Most of the researchers have focused on morphological studies and application of dual layer hollow fibre membranes as a separation medium.…”

Pushing the limits of high performance dual‐layer hollow fiber fabricated via I2PS process in dehydration of ethanol

“…Cellulose triacetate (CTA, CA‐436‐80S) was provided by Eastman Chemical Co., and used as the outer layer material since it has the inherently good chemical resistance and capability to form a relatively porous inner surface in the outer layer, while three commercially available materials; namely (1) poly(ether imide) (PEI) known as Ultem ® 1010 from SABIC innovative plastics, (2) polysulfone (PSf) known as Udel ® from Solvay advanced polymers, and (3) copolyimide of 3,3′4,4′benzophenone tetracarboxylicdianhydride and 80% methylphenylenediamine + 20% methylenediamine known as P84 ® from HP Polymer GmbH were employed as the inner layer materials to provide a wide range of inner layer materials for the I 2 PS spinning technology.…”

“…The concept of fabricating multilayer composite membranes has been implemented in the membrane industry . Ong and Chung recently proposed an alternative single‐step co‐spinning method to produce high performance hollow fibers for dehydration of ethanol via pervaporation by means of the immiscibility induced phase separation (I 2 PS) process. The I 2 PS technique used the occurrence of phase separation phenomena in the immiscible blend dopes that induce the formation of a selective layer between the inner layer and outer layer.…”

Review: membrane materials for the removal of water from industrial solvents by pervaporation and vapor permeation

“…In some cases, the polyimide is used in the preparation of the porous support layer for a dense selective layer of another polymer. 130,131 Thermally rearranged (TR) polymers have recently been reported for solvent dehydration. 132,133 TR polymers are formed when ortho-functional polyimides are thermally treated at temperatures up to about 450 ∘ C, causing a condensation reaction to yield a heterocyclic, aromatic structure that is both thermally stable and resistant to swelling.…”

“…A number of reports describe the potential advantages of stacking layers of different polymeric permselective materials to form the dense permselective layer of the composite membrane. 97,131,163,[188][189][190][191] For example, Membrane Technology and Research, Inc. described a multilayer membrane consisting of a layer of APFP on top of a cellulose ester layer. 97 As noted above, APFPs do not swell in water or in solvents whereas cellulose-based polymers are hydrophilic and will swell in water.…”