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US 2025/0170529 A1Published application
Methods for making charged ultrafiltration membranes and uses thereof in dairy applications
Assigneesfairlife, LLC, The Board of Trustees of The University of Alabama
InventorsStephen Michael Christopher RITCHIE, Shakeel UR REHMAN, Robert Connor SCOTT
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Abstract
Charged ultrafiltration membranes are synthesized by thermally initiated free-radical polymerization of sodium styrene sulfonate in the pores of an ultrafiltration pre-cursor membrane. The resulting grafted chains of the charged UF membrane provide significant negative charge to maintain nearly complete rejection of proteins at significantly higher flux.
Claims28
A method of making an ultrafiltration membrane, the method comprising:
- (a) contacting a pre-cursor membrane comprising a polyethersulfone (PES) and/or a polysulfone (PSF) with an aqueous solution comprising sodium styrene sulfonate and a free radical initiator;
- and
- (b) curing the pre-cursor membrane to form the ultrafiltration membrane, wherein the ultrafiltration membrane has sulfonated polystyrene bound in pores and/or bound on an external surface of the ultrafiltration membrane.
An ultrafiltration membrane comprising:
- (I) a polyethersulfone (PES) and/or a polysulfone (PSF) membrane;
- and
- (II) sulfonated polystyrene bound in pores and/or bound on an external surface of the ultrafiltration membrane.
Dependencies are inferred from the claim text.