Crosslinked polybenzimidazole membranes for organic solvent nanofiltration (OSN): Analysis of crosslinking reaction mechanism and effects of reaction parameters

Valtcheva, Irina B.; Marchetti, Patrizia; Livingston, Andrew G.

doi:10.1016/j.memsci.2015.06.056

Cited by 115 publications

(83 citation statements)

References 46 publications

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“…Non-crosslinked and crosslinked polybenzimidazole (PBI) membranes were prepared based on the recent developments of solvent resistant PBI membranes by Valtcheva et al [31,32]. N,N-Dimethylacetamide (DMAc) and water were used as the casting solvent for the polymer and the coagulation medium (non-solvent), respectively.…”

Section: Polybenzimidazole (Pbi) Membrane Fabricationmentioning

confidence: 99%

Solvent recycle with imperfect membranes: A semi-continuous workaround for diafiltration

Schaepertoens

Didaskalou

Kim

et al. 2016

Journal of Membrane Science

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For separation of a two-component mixture, a three-stage organic solvent nanofiltration (OSN) process is presented which comprises of a two-stage membrane cascade for separation with a third membrane stage added for integrated solvent recovery, i.e. solvent recycling. The two-stage cascade allows for increased separation selectivity whilst the integrated solvent recovery stage mitigates the otherwise large solvent consumption of the purification. This work explores the effect of washing the solvent recovery unit at intervals in order to attain high product purities with imperfect solvent recovery membranes possessing less than 100 % rejection of the impurity. This operation attains a purity of 98.7 % through semi-continuous operation with two washes of the solvent recovery stage, even when imperfect membranes are used in a closed-loop set-up. This contrasts favourably with the 83.0 % maximum purity achievable in a similar set-up with a single continuous run. The process achieves slightly lower (-0.7 %) yield of around 98.2 % compared to a continuously operated process without solvent recovery but consumes approx. 85 % less solvent (theoretical analysis suggests up to 96 % reduction is possible). 9 different membranes, both commercial (GMT, Novamem, SolSep) and in-house fabricated, are screened and tested on a separation challenge associated with the synthesis of macrocycles -amongst the membrane materials are polyimide (PI), polybenzimidazole (PBI) and, polyetheretherketone (PEEK).3

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Section: Polybenzimidazole (Pbi) Membrane Fabricationmentioning

confidence: 99%

Solvent recycle with imperfect membranes: A semi-continuous workaround for diafiltration

Schaepertoens

Didaskalou

Kim

et al. 2016

Journal of Membrane Science

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“…8 And this method involves the use of expensive polymeric materials such as polyimide (PI) and polybenzimidazole (PBI) as the support membrane to ensure the durability of the membranes in the presence of strong solvents. 1,[10][11][12] Recently, OSN membranes have been commercialized using these polymers for organic solvent separation or purication.…”

Section: 2mentioning

confidence: 99%

One-step fabrication of polyamide 6 hollow fibre membrane using non-toxic diluents for organic solvent nanofiltration

et al. 2018

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We developed new polyamide 6 hollow fibre membranes using a green process to fabricate cutting-edge "organic solvent nanofiltration" membranes by one-step spinning process for organic solvent separation.This economic and sustainable membrane showed good rejection and durability performance in various organic solvents.Organic solvent nanoltration (OSN) process is one of the emerging separation technologies used extensively in various industries such as petrochemical, pharmaceutical, chemical, and food for the purication or separation of organic solvents.

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“…However, polymeric membranes often undergo flux decline over time due to either polymer chain compaction or swelling of the polymer matrix upon the exposure to the organic solvents . Chemical crosslinking of the polymer chains usually enhances the performance of polymeric membranes for OSN and indeed most of the polymeric membranes used in OSN are post‐treated to induce chemical crosslinking . For example, crosslinking of interfacially polymerized membranes on top of polyimide supports was reported recently to enhance the stability of these membrane when exposed to N , N ‐dimethylformamide (DMF) for 2 weeks at 80 °C .…”

Section: Introductionmentioning

confidence: 99%

“…[13] Chemical crosslinking of the polymer chains usually enhances the performance of polymeric membranes for OSN and indeed most of the polymeric membranes used in OSN are post-treated to induce chemical crosslinking. [14][15][16][17][18] For example, crosslinking of interfacially polymerized membranes on top of polyimide supports was reported recently to enhance the stability of these membrane when exposed to N,N-dimethylformamide (DMF) for 2 weeks at 80 °C. [19] Mertens et al, described a solvent activation effect for crosslinked poly(vinylidene difluoride) PVDF membranes, where the solvent flux increased by a factor of 11 without compromising selectivity.…”

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confidence: 99%

Silane‐Crosslinked Asymmetric Polythiosemicarbazide Membranes for Organic Solvent Nanofiltration

Aburabie

Emwas

Peinemann

2018

Macro Materials & Eng

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Crosslinked polythiosemicarbazide (PTSC) membranes with a positively charged surface are fabricated via a reaction with (3‐glycidyloxypropyl)trimethoxysilane. The integrally asymmetric ultrafiltration membranes discussed here can be easily prepared by water‐induced phase separation using a PTSC solution in dimethylsulfoxide (DMSO). The crosslinked PTSC membranes are stable in DMSO, N,N‐dimethylformamide, and tetrahydrofuran and they reject molecules of molecular weights (MW) above 1300 g mol−1. The influence of the crosslinking agent on the surface charge, membrane solvent resistance, and membrane performance is discussed. The crosslinked asymmetric PTSC membranes totally reject Direct Red dye (MW 1373 g mol−1), while the pristine PTSC membrane does not show any rejection for this dye. This finding suggests that an inorganic‐type‐network is formed during the crosslinking reaction, which tunes the pore size of the prepared membranes.

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Crosslinked polybenzimidazole membranes for organic solvent nanofiltration (OSN): Analysis of crosslinking reaction mechanism and effects of reaction parameters

Cited by 115 publications

References 46 publications

Solvent recycle with imperfect membranes: A semi-continuous workaround for diafiltration

Solvent recycle with imperfect membranes: A semi-continuous workaround for diafiltration

One-step fabrication of polyamide 6 hollow fibre membrane using non-toxic diluents for organic solvent nanofiltration

Silane‐Crosslinked Asymmetric Polythiosemicarbazide Membranes for Organic Solvent Nanofiltration

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