Preparation of pilot-scale inner skin hollow fiber pervaporation membrane module: Effects of dynamic assembly conditions

Single-side hydrolysis of hollow fiber polyacrylonitrile membrane by an interfacial hydrolysis of a solvent-impregnated membrane

“…Based on the single-side hydrolyzed PAN substrate membranes, the PEMMs were also prepared by using a laboratory fabricated cross-flow filtration cell [12,13]. The PEI and PAA solutions were alternatively provided into the lumen side of hydrolyzed hollow fiber and then recycled by using two peristaltic pumps and through separate tubings.…”

“…The PEMMs were assembled by alternatively filtrating PEI and PAA for 30 min. The assembly steps were orderly carried out as previously reported [12,13]. Upon the formation of PEMMs, they were stored for pervaporation experiments.…”

“…Therefore, PAN has been successfully applied as one of the fascinating membrane materials. In recent years, one of the most important applications is that the porous PAN UF membranes were used as the supports for nanofiltration and pervaporation composite membranes [3][4][5][6][7][8][9][10][11][12][13][14]. This is because PAN membrane surface is relatively active and in turn the property is much easier to be modified.…”

“…This is because PAN membrane surface is relatively active and in turn the property is much easier to be modified. The modifications of PAN UF membranes usually include plasma treatment [3], plasma-initiated graft polymerization [4][5][6], photo-induced grafting [7] and hydrolysis [8][9][10][11][12][13][14]. Among these methods, alkaline hydrolysis is one of the most important and most frequently used methods for PAN-based membranes, due to the convenience and favorableness for further modification.…”

“…Additionally, it has been reported that the hydrolysis of PAN UF membrane would change the membrane pore size and in turn affect the flux of subsequent modified membrane [10,14]. In the past studies, to accomplish the hydrolysis, the PAN mem- branes were usually entirely immersed into the alkaline solution [8][9][10][11][12][13][14]. Even if the PAN membrane was initially contacted alkaline solution with single-side surface, it was observed that a few NaOH solutions could always permeate through the membranes.…”