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Graft modification of polybenzimidazole membranes for organic solvent ultrafiltration with scale up to spiral wound modules.

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Bibliographic Details
Title: Graft modification of polybenzimidazole membranes for organic solvent ultrafiltration with scale up to spiral wound modules.
Authors: Oxley, Adam1 (AUTHOR), Gaffney, Piers R.J.1 (AUTHOR), Kim, Daeok1 (AUTHOR), Marchetti, Patrizia1 (AUTHOR), Livingston, Andrew G.1,2 (AUTHOR) a.livingston@qmul.ac.uk
Source: Journal of Membrane Science. Apr2022, Vol. 647, pN.PAG-N.PAG. 1p.
Subjects: Organic solvents, Molecular weights, Small molecules, Graft copolymers, Wounds & injuries, Ultrafiltration
Abstract: In this work the selectivity of crosslinked organic solvent stable PBI membranes is tuned by varying the molar ratio of two grafting agents: a long flexible polymer modifier (Elastamine RE-1-1000, 1000 g mol-1) and a small molecule modifier (2-methoxyethylamine, 75 g mol-1). Grafting exclusively with the long chain modifier provided a membrane with a molecular weight cut-off (MWCO) of 2000 g mol-1 in acetonitrile. Increasing the proportion of small molecule modifier in the grafting reaction capped the grafting sites in the membrane. This caused a decrease in the grafting density of the polymer modifier and allowed for the MWCO to be customised between 2000 g mol-1 and 20,000 g mol-1 in acetonitrile. High grafting densities underlie this control of performance, with up to 43% increase in the specific weight of the membrane during modification. This technique was scaled up to the manufacture of 5 m lengths of membrane that were incorporated into 1.8″ x 12" spiral wound modules, which showed performance consistent with the flat sheet membranes. [Display omitted] • Crosslinked polybenzimidazole (PBI) membranes have high stability in harsh solvents. • Graft modification allows for customisation of the rejection profile of PBI. • Graft modifier is present throughout the permeation pathways of the membrane. • The resulting membranes span from loose nanofiltration to tight ultrafiltration. • The membranes have consistent performance as flat sheets and spiral wound modules. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In this work the selectivity of crosslinked organic solvent stable PBI membranes is tuned by varying the molar ratio of two grafting agents: a long flexible polymer modifier (Elastamine RE-1-1000, 1000 g mol-1) and a small molecule modifier (2-methoxyethylamine, 75 g mol-1). Grafting exclusively with the long chain modifier provided a membrane with a molecular weight cut-off (MWCO) of 2000 g mol-1 in acetonitrile. Increasing the proportion of small molecule modifier in the grafting reaction capped the grafting sites in the membrane. This caused a decrease in the grafting density of the polymer modifier and allowed for the MWCO to be customised between 2000 g mol-1 and 20,000 g mol-1 in acetonitrile. High grafting densities underlie this control of performance, with up to 43% increase in the specific weight of the membrane during modification. This technique was scaled up to the manufacture of 5 m lengths of membrane that were incorporated into 1.8″ x 12" spiral wound modules, which showed performance consistent with the flat sheet membranes. [Display omitted] • Crosslinked polybenzimidazole (PBI) membranes have high stability in harsh solvents. • Graft modification allows for customisation of the rejection profile of PBI. • Graft modifier is present throughout the permeation pathways of the membrane. • The resulting membranes span from loose nanofiltration to tight ultrafiltration. • The membranes have consistent performance as flat sheets and spiral wound modules. [ABSTRACT FROM AUTHOR]
ISSN:03767388
DOI:10.1016/j.memsci.2021.120199