Influence of the blend composition on the properties and separation performance of novel solvent resistant polyphenylsulfone/polyimide nanofiltration membranes

Influence of polymer concentration in casting solution and solvent-solute-membrane interactions on performance of polyphenylsulfone (PPSU) nanofiltration membrane in alcohol solvents

“…Compared to the 17 and 21 wt% PPSU membrane, in which the cross sectional structure was dominated by finger-like microvoids, the development of tortuous sponge-like morphology as shown in the 25 wt% PPSU membrane has played a role in increasing solvent transport resistance and reducing methanol productivity. These results are consistent with findings reported elsewhere, in which increasing polymer concentration in the casting solution could result in lower organic solvent flux of the membrane [30,35,36]. With respect to rejection, it is observed that the rejection trend of CR is inversely proportional to solvent permeability, in which the higher the dye rejection is, the lower the methanol permeability is and vice versa.…”

“…The exponential increase in polymer viscosity with polymer concentration will remarkably delay the exchange rate between the solvent and water during the polymer precipitation process, leading to a higher polymer concentration at the interface between the polymer solution and the nonsolvent (water) and results in development of a less porous morphology, as evidenced in this study. A similar observation was also reported elsewhere [30,34,35]. Table 5 also shows the effect of polymer concentration on the contact angle values of the PPSU membranes.…”

Polyphenylsulfone-based solvent resistant nanofiltration (SRNF) membrane incorporated with copper-1,3,5-benzenetricarboxylate (Cu-BTC) nanoparticles for methanol separation

“…Increasing Cu-BTC loading seems to be important in enhancing solvent ux of PPSU-based membrane. 16 It can be seen that the membrane rejection is increased with increasing solute MW, irrespective of Cu-BTC loading. 34 The possible surface defects due to the signicant particles aggregation as shown in Fig.…”

“…The possible industrial applications of SRNF-based technologies include recovery of solvent in lube oil dewaxing processes, 1 degumming of vegetable oil, 2 reuse of extraction solvent in the food industry 3 and purication of active pharmaceutical ingredients (API). 5,7,16 The advent of new type membrane so-called mixed matrix membrane (MMM) has received enhanced attention recently. This asymmetric conguration is further deduced as: (a) the integral type, where the entire membrane is composed of the same polymeric material and (b) the thin-lm composite (TFC), where the membrane separating layer is made of a different material.…”

Evaluation of reverse osmosis and nanofiltration membranes performance in the permeation of organic solvents

“…All the authors noted improvements in the permeate flux after the pretreatment. According to these studies, membrane conditioning can prevent pore collapse during permeation of non-polar solvents [13][14][15] and enable the solvent to reach all membrane pores, increasing the permeate flux [16]. Moreover, conditioning would also change polarity characteristics of the membranes, which are mainly hydrophilic, increasing its permeability to the organic solvents.…”