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Solvent resistant polyamide nanofiltration membranes

a technology of nanofiltration membrane and solvent resistance, which is applied in the direction of membranes, filtration separation, separation processes, etc., can solve the problems that the thin film composite membranes of the prior art fabricated with such supports cannot be effectively utilized for all organic solvent nanofiltration applications, and the solute separation of organic solvents is not widely applied. , to achieve the effect of high flux

Inactive Publication Date: 2013-05-09
IMPERIAL INNOVATIONS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides membranes that can be used for nanofiltration operations in polar aprotic solvents. By using an activating solvent during or after interfacial polymerization, the membranes become more effective with improved properties, such as increased membrane flux. In addition, the membranes can exhibit higher fluxes when processing mixtures of water and organic solvents, which is an advantage compared to previous membranes.

Problems solved by technology

Nanofiltration has been widely applied to filtration of aqueous fluids, but due to a lack of suitable solvent stable membranes, it has not been widely applied to the separation of solutes in organic solvents.
These supports have limited stability for organic solvents and, therefore, thin film composites membranes of the prior art which are fabricated with such supports cannot be effectively utilized for all organic solvent nanofiltration applications.
However, in these prior art TFC membranes the use of a polysulfone support membrane limits the potential for additives to either aqueous amine solution or organic acid halide solution.
Prior art TFC membranes are not claimed to be suited for filtrations in harsh solvents (e.g. THF, DMF).

Method used

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  • Solvent resistant polyamide nanofiltration membranes
  • Solvent resistant polyamide nanofiltration membranes
  • Solvent resistant polyamide nanofiltration membranes

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0096]In the following example, membranes of the present invention are formed through interfacial polymerisation to form a polyamide on a crosslinked polyimide support membrane, as follows:

[0097]Formation of Crosslinked Polyimide Support Membrane

[0098]A polymer dope solution was prepared by dissolving 24% (w / w) polyimide (P84 from Evonik AG) in DMSO and stiffing overnight until complete dissolution. A viscous solution was formed, and allowed to stand for 10 hours to remove air bubbles. The dope solution was then cast on a polyester or polypropylene (Viledon, Germany) non-woven backing material taped to a glass plate using a casting knife (Elcometer 3700) set at a thickness of 250 Immediately after casting, the membrane was immersed in a water bath where phase inversion occurred. After 15 minutes, it was changed to a new water bath and left for an hour. The wet membrane was then immersed in a solvent exchange bath (isopropanol) to remove any residual water and preparation solvents.

[0...

example 2

[0108]TFC membranes were fabricated as per EXAMPLE 1. Post-formation step (d) (contacting with DMF as an activating solvent) was only performed for some of the membranes. The performance of TFC membranes with and without the activation step (d) contacting with DMF was evaluated in different solvents, including acetone, methanol, ethyl acetate and toluene.

[0109]For the MWCO curves and flux test in MeOH, acetone, toluene and ethyl acetate with and without contacting with DMF, eight new MPD membranes were tested at each time and the results for both rejection and flux were reproducible.

[0110]FIG. 4 shows rejection curves and flux for TFC membranes in acetone / PS without treating the membrane with an activating solvent. FIG. 5 shows rejection curves and flux for TFC membranes during nanofiltration of acetone / PS solution after treating the membranes with DMF.

[0111]FIG. 6 shows rejection curves and flux for TFC membranes during nanofiltration of MeOH / PS without treating the membrane with a...

example 3

[0114]Membrane supports were fabricated as per EXAMPLE 1 but were not conditioned with PEG. TFC membranes were fabricated on these non-conditioned support membranes as per EXAMPLE 1. The performance of TFC membranes prepared on membrane supports with and without PEG was then evaluated and compared.

[0115]Membrane identification codes for the TFC membranes prepared in this Example are as follows:

EntryMembraneNo.Membranecode2TFC membrane prepared on crosslinked PI asMPD-nsupport impregnated with PEG3TFC membrane prepared on crosslinked PI supportMPD-NP-nnot impregnated with PEGWhere n identifies membranes made in independent batch n.

[0116]FIG. 10 shows rejection curves and flux for TFC membranes prepared on membrane supports without PEG in DMF / PS solution. FIG. 11 shows rejection curves and flux for TFC membranes prepared on membrane supports with PEG in DMF / PS solution. An increase in flux can be observed when TFC membranes are prepared on membrane supports containing PEG.

[0117]In thi...

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Abstract

The present invention relates to a composite membrane for nanofiltration of a feed stream solution comprising a solvent and dissolved solutes and showing preferential rejection of the solutes. The composite membrane comprises a thin polymeric film formed by interfacial polymerisation on a support membrane. The support membrane is further impregnated with a conditioning agent and is stable in polar aprotic solvents. The composite membrane is optionally treated in a quenching medium, where the interfacial polymerisation reaction can be quenched and, in certain embodiments, membrane chemistry can be modified. Finally the composite membrane is treated with an activating solvent prior to nanofiltration.

Description

[0001]The work leading to this invention has received funding from the European Union Seventh Framework Programme (FP7 / 2007-2013) under grant agreement no 214226.FIELD OF INVENTION[0002]The present invention relates to thin film composite membranes formed by interfacial polymerisation. Membranes and membrane systems described herein may be used in a variety of applications, including, but not limited to, nanofiltration, desalination and water treatment, and particularly the nanofiltration of solutes dissolved in organic solvents.BACKGROUND TO THE INVENTION[0003]Membrane processes have been widely applied in separation science, and can be applied to a range of separations of species of varying molecular weights in liquid and gas phases (see for example “Membrane Technology and Applications” 2nd Edition, R. W. Baker, John Wiley and Sons Ltd, ISBN 0-470-85445-6).[0004]With particular reference to nanofiltration, such applications have gained attention based on the relatively low operat...

Claims

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Application Information

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IPC IPC(8): B01D69/12
CPCB01D61/022B01D67/0088B01D69/105B01D69/12B01D71/56B01D71/64B01D69/125B01D61/027B01D2325/38B01D2323/46B01D69/1251B01D71/42
Inventor LIVINGSTON, ANDREW GUYBHOLE, YOGESH SURESHJIMENEZ SOLOMON, MARIA FERNANDA
Owner IMPERIAL INNOVATIONS LTD
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