Asymmetric membranes for use in nanofiltration

a technology of asymmetric membranes and nanofiltration, applied in the direction of membranes, filtration separation, separation processes, etc., can solve the problems of not being widely applied to the separation of organic solvent solutes, no reports to date describing the application of osn in strongly basic or acidic organic solvent environments, and integrally skinned polyimide membranes formed by phase inversion are not stable in all solvents, so as to achieve low or no flux and high flux
US20130118983A1Inactive Publication Date: 2013-05-16IMPERIAL INNOVATIONS LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
IMPERIAL INNOVATIONS LTD
Publication Date
2013-05-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

Improved integrally skinned asymmetric membranes for organic solvent nanofiltration, and their methods of preparation and use are disclosed. Membranes are formed from polybenzimidazoles by phase inversion and are then crosslinked by addition of crosslinking agents. These stabilise the membranes and allow solvent nanofiltration to be maintained even in the solvents from which the membranes were formed by phase inversion, and in strongly acidic and strongly basic solvents.
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Description

FIELD OF THE INVENTION

[0001] The present invention relates to asymmetric membranes for nanofiltration, particularly nanofiltration of solutes dissolved in organic solvents, and particularly the nanofiltration of solutes dissolved in strongly basic and acidic organic solvent environments.BACKGROUND TO THE INVENTION

[0002] Membrane processes are well known in the art of 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).

[0003] Nanofiltration is a membrane process utilising membranes whose pores are generally in the range 0.5-5 nm, and which have molecular weight cut-offs in the region of 200-2,000 Daltons. Molecular weight cut-off of a membrane is generally defined as the molecular weight of a molecule that would exhibit a rejection of 90% when subjected to nanofiltration by the membr...

Claims

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