Chemistry in a spinneret—On the interplay of crosslinking and phase inversion during spinning of novel hollow fiber membranes

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

doi:10.1016/j.memsci.2010.12.010

Cited by 46 publications

(20 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…All of these techniques have, however, obvious drawbacks: time and energy consumption due to the multistep fabrication, requires large amounts of water, washing baths and drying ovens, and, in most cases, resulting membranes have also poor stability. , Additionally, the support membranes need to be assembled into modules first, and then the modification is operated; defects that might occur during module preparation, pressure losses, and differences in concentration of the reagents along the module that result in irregular modification are the most important disadvantages to be mentioned. All of these together with the multistep production process lead to an increase in the production time and costs. − Aiming toward the one-step preparation methods, asymmetric hollow fiber membranes for ultrafiltration (UF) and gas separation were recently obtained in our group by the method called “chemistry in a spinneret”, which integrates into a single step both membrane formation and the cross-linking reaction between the membrane polymer (polyimide P84) and the cross-linking agent poly(ethylene imine) (PEI) dissolved in the bore liquid . For NF applications, a recent technique named dual-layer spinning was employed to prepare in a single-step NF hollow fibers containing a separation layer on a porous support by coextrusion of two polymer dope solution through a triple spinneret. − These membranes surpass the drawbacks of time and tedious multistep processes, but exhibit bad adhesion between the layers, overcoming the delamination problem being the subject of further research …”

Section: Introductionmentioning

confidence: 99%

Dual-Charged Hollow Fiber Membranes for Low-Pressure Nanofiltration Based on Polyelectrolyte Complexes: One-Step Fabrication with Tailored Functionalities

Gherasim

Luelf

Roth

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

A new nanofiltration (NF) hollow fiber membrane is developed by using two oppositely charged polyelectrolytes coagulating into a polyelectrolyte complex (PEC) onto polyether sulfone base polymer. The particular membrane architecture emerges during a single-step procedure, allowing setting both the porous negatively charged support of the hollow fiber and the separation layer containing also the positive polyelectrolyte (PEI/PDADMAC) through a single layer dry-jet wet spinning process. The novelty is two-pronged: the composition of the hollow fiber membrane itself and its fabrication procedure (one-step fabrication of membranes employing polyelectrolytes). These result in highly permeable hollow fiber membranes with a stable separation layer and performance at par with the membranes reported in literature obtained by multistep processes. More importantly, the membranes are obtained through a simple, very fast (one-step), and less expensive procedure. The best performance among these newly obtained hollow-fiber membranes is achieved by PD5% hollow fiber (MWCO of 300 Da), which showed 7.6 L/m(2)·h·bar permeability and ∼90% rejection of MgCl2, MgSO4, and Na2SO4 at 2 bar pressure. Thus, the resulting membranes not only have the advantages of the hollow-fiber configuration, but perform very well at extremely low pressures (the lowest reported in the literature). The broad impact of the results presented in this Article lies in the potential to dramatically reduce both the fabrication (duration and complexity) and the price and desalination costs of highly performing NF hollow fiber membranes. These might result in interesting potential applications and open new directions toward designing efficient functional NF hollow fibers for water desalination.

show abstract

Section: Introductionmentioning

confidence: 99%

Dual-Charged Hollow Fiber Membranes for Low-Pressure Nanofiltration Based on Polyelectrolyte Complexes: One-Step Fabrication with Tailored Functionalities

Gherasim

Luelf

Roth

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…Jiang et al reported the usage of polysulfone and Matrimid ® as outer and inner layer dope solutions, respectively to form an interpenetrating polymer network at the interface between the inner and outer layers. Furthermore, Kopéc et al reported on the usage of a triple orifice spinneret to fabricate a single‐layer hollow fiber membrane with an inner selective skin by introducing the concept of “chemistry in a spinneret”. A crosslinker was added to the bore fluid to induce simultaneous crosslinking and phase inversion during the spinning process, while a mixture of solvent and nonsolvent was flown at the outer layer to control the thickness of the inner selective layer.…”

Section: Introductionmentioning

confidence: 99%

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

Ong

Chung

2013

AIChE Journal

View full text Add to dashboard Cite

The immiscibility induced phase separation (I 2 PS) process was introduced as a novel method to fabricate hollow fibers with exceptionally high water permeance and reasonably high water/ethanol selectivity in dehydration of ethanol by pervaporation. As a continuation of the previous work, this study discloses the mechanisms to enhance the performance of hollow fibers spun via I 2 PS by elucidating the material selection at the inner-layer. Moreover, it revealed the methods to reduce mass-transport resistance by enhancing surface porosity for both inner and outer surfaces to further improve the permeation flux of the membranes. The continuous performance test demonstrates that the fibers spun from the I 2 PS possess a stable dehydration performance throughout the monitored period of 300 h. A comparison with pervaporation membranes in the literatures verifies the superiority of the membranes spun via I 2 PS process with the highest water permeation flux of 9.5 kg/m 2 h and the permeate water purity of 95.8 wt % at 80 C. V C 2013 American Institute of Chemical Engineers AIChE J, 59: [3006][3007][3008][3009][3010][3011][3012][3013][3014][3015][3016][3017][3018] 2013 Inner-layer dope flow rate: 1.5ml/min; air gap: 1.5 cm; take up speed: free fall Solvent for treatment: Acetone/water (85/15 wt%) Feed: Ethanol/water (85/15 wt%) at 50 C

show abstract

Chemistry in a spinneret—On the interplay of crosslinking and phase inversion during spinning of novel hollow fiber membranes

Cited by 46 publications

References 30 publications

Dual-Charged Hollow Fiber Membranes for Low-Pressure Nanofiltration Based on Polyelectrolyte Complexes: One-Step Fabrication with Tailored Functionalities

Dual-Charged Hollow Fiber Membranes for Low-Pressure Nanofiltration Based on Polyelectrolyte Complexes: One-Step Fabrication with Tailored Functionalities

Direktes Herstellungsverfahren von Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie

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

Contact Info

Product

Resources

About

Chemistry in a spinneret—On the interplay of crosslinking and phase inversion during spinning of novel hollow fiber membranes

Cited by 46 publications

References 30 publications

Dual-Charged Hollow Fiber Membranes for Low-Pressure Nanofiltration Based on Polyelectrolyte Complexes: One-Step Fabrication with Tailored Functionalities

Dual-Charged Hollow Fiber Membranes for Low-Pressure Nanofiltration Based on Polyelectrolyte Complexes: One-Step Fabrication with Tailored Functionalities

Direktes Herstellungsverfahren von Komposit‐Hohlfasermembranen mit sinusförmiger Geometrie

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

Contact Info

Product

Resources

About

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