“Chemistry in a spinneret” to fabricate hollow fibers for organic solvent filtration

Dutczak, S.M.; Tanardi, Cheryl; Kopec, K.K.; Weßling, Matthias; Stamatialis, Dimitrios

doi:10.1016/j.seppur.2011.11.003

Cited by 41 publications

(30 citation statements)

References 29 publications

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“…Cross‐linking of polyimide membranes with diamines was initially developed for nonporous membranes such as gas separation and pervaporation . Later, it was reported to improve the solvent stability of nanoporous membranes and allow the cross‐linked membranes to be stable in harsh organic solvents . However, to obtain a membrane with surface pore size small enough to reject pharmaceutical solutes with low molecular weights, the resultant bulk substrate is often dense .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of flux and solvent stability of Matrimid^® thin‐film composite membranes for organic solvent nanofiltration

et al. 2014

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The development of high flux and solvent-stable thin-film composite (TFC) organic solvent nanofiltration (OSN) membranes was reported. A novel cross-linked polyimide substrate, consisting of a thin skin layer with minimum solvent transport resistance and a sponge-like sublayer structure that could withstand membrane compaction under highpressure was first fabricated. Then the solvent flux was significantly enhanced without compromising the solute rejection by the coupling effects of (1) the addition of triethylamine/camphorsulfonic acid into the monomer solution, and (2) the combined post-treatments of glycerol/sodium dodecyl sulphate immersion and dimethyl sulfoxide (DMSO) filtration. Finally, the long-term stability of the TFC membrane in aprotic solvents such as DMSO was improved by post-crosslink thermal annealing. The novel TFC OSN membrane developed was found to have superior rejection to tetracycline (MW: 444 g/mol) but was very permeable to alcohols such as methanol (5.12 lm 22 h 21 bar 21 ) and aprotic solvents such as dimethylformamide (3.92 lm 22 h 21 bar 21 ) and DMSO (3.34 lm 22 h 21 bar 21 ).Solutes dissolved in various organic solvents were subjected to NF experiments in stainless steel permeation cells at 10 bar and rapid stirring (700 rpm). Solvent flux was obtained from the following equationFigure 11. Effects of post-crosslink thermal annealing time on long-term separation performance and membrane stability in (a) methanol and (b) DMSO solutions.

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Section: Introductionmentioning

confidence: 99%

Enhancement of flux and solvent stability of Matrimid^® thin‐film composite membranes for organic solvent nanofiltration

et al. 2014

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“…BHTTM (98.5 wt %) was synthesized in our laboratory (Figure ). Detailed information on BHTTM is shown elsewhere . TMC (98.0 wt %) was obtained from Qingdao Benzo Chemical Co. (Qingdao, China).…”

Section: Methodsmentioning

confidence: 99%

“…In addition, compared with flat membranes, hollow‐fiber membranes are more flexible and easier to enlarge . In this study, three NF membranes of PIP–BPF, PIP–BPF–BHTTM, and PIP–BHTTM were prepared via IP on the outer surface of self‐made PES hollow‐fiber substrate membranes.…”

Section: Introductionmentioning

confidence: 99%

High‐performance composite nanofiltration membranes fabricated via ternary mixture: Complementary preponderance of the fluorine‐containing monomer 2,2′‐bis(1‐hydroxyl‐1‐trifluoromethyl‐2,2,2‐triflutoethyl)‐4,4′‐methylene dianiline and the rigid monomer bisphenol F

Tang

Ding

et al. 2018

J of Applied Polymer Sci

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In a previous study, we proved that tailoring the polyamide backbone stiffness is an effective way to fabricate high‐performance polyamide nanofiltration (NF) membranes. However, in the previous study, we mainly focused on the flat membrane and did not consider its chlorine tolerance. In this study, by regulating the aqueous‐phase compositions in the interfacial polymerization process, chlorine tolerance on NF hollow‐fiber membranes was endowed while the membrane performance stayed high. The experimental results show that when the ratio of Piperazine (PIP)–bisphenol F (BPF)/2,2′‐bis(1‐hydroxyl‐1‐trifluoromethyl‐2,2,2‐triflutoethyl)‐4,4′‐methylene dianiline (BHTTM) was 5:1:4, the NF membrane possessed a permeate flux of 21.0 L m−2 h−1 bar−1 and an Na2SO4 rejection up to 90.0%. X‐ray photoelectron spectroscopy analysis also confirmed that the polymerization degree of the PIP–BPF–BHTTM NF membrane was the highest. Moreover, the NF membrane could tolerate active chlorine to over 10,000 ppm h Cl. After the active chlorine treatment, the permeate flux increased over 30.0 L m−2 h−1 bar−1, and the Na2SO4 rejection was about 90.0%. Although the PIP–BHTTM NF membrane also possessed good chlorine tolerance, its permeate flux (after active chlorine treatment) was only 60% of that of the PIP–BPF–BHTTM NF membrane. Therefore, the PIP–BPF–BHTTM NF membrane possessed a combination of high flux and high chlorine tolerance and showed good potential in water treatment in rigorous environments. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46482.

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“…Mit dem direkten Spinnverfahren, dass zusätzlich auf einer chemischen Reaktion in der Spinndüse basiert, kann eine oberflächenmodifizierte Hohlfasermembran in einem Prozessschritt hergestellt werden , . Bei der ersten Anwendung dieses Konzepts wurde ein reaktives Polymer verwendet, das durch Phaseninversion in eine poröse Trägerstruktur umgewandelt wird und gleichzeitig mit einem Reaktanten aus der Lumenflüssigkeit reagiert .…”

Section: Introductionunclassified

Direktes Herstellungsverfahren von Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie

Roth

Alders

Luelf

et al. 2019

Chemie Ingenieur Technik

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Mit dem direkten Spinnverfahren können Komposit‐Hohlfasermembranen in einem einstufigen Prozess hergestellt werden. Dabei wird die klassische Faserbildung mit einer Grenzflächenpolymerisation auf der Lumenseite der Hohlfaser überlagert. Für die Herstellung von sinusförmigen Hohlfasermembranen wird im herkömmlichen Nassspinnprozess zusätzlich die Lumenflüssigkeit während des Spinnens pulsiert. In dieser Arbeit wurden Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie hergestellt. Die sinusförmige Geometrie kann Konzentrationspolarisationseffekte in Membrananwendungen reduzieren.

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“Chemistry in a spinneret” to fabricate hollow fibers for organic solvent filtration

Cited by 41 publications

References 29 publications

Enhancement of flux and solvent stability of Matrimid^® thin‐film composite membranes for organic solvent nanofiltration

Enhancement of flux and solvent stability of Matrimid^® thin‐film composite membranes for organic solvent nanofiltration

High‐performance composite nanofiltration membranes fabricated via ternary mixture: Complementary preponderance of the fluorine‐containing monomer 2,2′‐bis(1‐hydroxyl‐1‐trifluoromethyl‐2,2,2‐triflutoethyl)‐4,4′‐methylene dianiline and the rigid monomer bisphenol F

Direktes Herstellungsverfahren von Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie

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“Chemistry in a spinneret” to fabricate hollow fibers for organic solvent filtration

Cited by 41 publications

References 29 publications

Enhancement of flux and solvent stability of Matrimid® thin‐film composite membranes for organic solvent nanofiltration

Enhancement of flux and solvent stability of Matrimid® thin‐film composite membranes for organic solvent nanofiltration

High‐performance composite nanofiltration membranes fabricated via ternary mixture: Complementary preponderance of the fluorine‐containing monomer 2,2′‐bis(1‐hydroxyl‐1‐trifluoromethyl‐2,2,2‐triflutoethyl)‐4,4′‐methylene dianiline and the rigid monomer bisphenol F

Direktes Herstellungsverfahren von Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie

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Enhancement of flux and solvent stability of Matrimid^® thin‐film composite membranes for organic solvent nanofiltration

Enhancement of flux and solvent stability of Matrimid^® thin‐film composite membranes for organic solvent nanofiltration