US 12,434,222 B2
Cross-linked polymeric ammonium salts and their use in absorbing organic contaminants
Seetha M. Coleman-Kammula, Newark, DE (US); Garret D. Figuly, Wilmington, DE (US); Charles R. Powley, Wilmington, DE (US); and Debora Flanagan Massouda, Wilmington, DE (US)
Assigned to STRIDE, New Castle, DE (US)
Filed by STRIDE, New Castle, DE (US)
Filed on Feb. 6, 2023, as Appl. No. 18/165,091.
Application 18/165,091 is a continuation in part of application No. 17/822,317, filed on Aug. 25, 2022, abandoned.
Application 17/822,317 is a continuation of application No. 17/480,579, filed on Sep. 21, 2021, abandoned.
Claims priority of provisional application 63/081,129, filed on Sep. 21, 2020.
Prior Publication US 2023/0182113 A1, Jun. 15, 2023
Int. Cl. B01J 20/26 (2006.01); B01J 20/20 (2006.01); B01J 20/34 (2006.01); C02F 1/28 (2023.01); C02F 101/36 (2006.01); C02F 103/00 (2006.01); C02F 103/34 (2006.01); C02F 103/42 (2006.01)
CPC B01J 20/267 (2013.01) [B01J 20/20 (2013.01); B01J 20/3416 (2013.01); B01J 20/3425 (2013.01); B01J 20/3475 (2013.01); C02F 1/288 (2013.01); C02F 1/283 (2013.01); C02F 1/285 (2013.01); C02F 2101/36 (2013.01); C02F 2103/007 (2013.01); C02F 2103/34 (2013.01); C02F 2103/42 (2013.01); C02F 2303/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for absorbing at least one PFAS molecule from an aqueous medium wherein said at least one PFAS molecule comprises a water soluble fluorinated amphiphilic structure with a carbon chain length that ranges from 4 to at least 14 carbon atoms which comprises:
contacting said PFAS molecule with at least one self-supported crosslinked polymeric ammonium salt, wherein said salt is a water-insoluble, solid polyelectrolyte having at least one polymer chain,
wherein said polyelectrolyte comprises a copolymer network wherein ammonium nitrogen atoms are separated by group Y or group Z ordered along (i) polymer chains as N—Z—[N—Y—N—Z]n—N and along (ii) cross-linking polymer chains as Y, or Y—N—Z—N—[Y—N—Z—N]n—Y, wherein said cross linking polymer chains connect between one ammonium nitrogen atom in one polymer chain, and another ammonium nitrogen atom in another polymer chain and (iii) along pendant polymer chains as Y—N—Z—[N—Y—N—Z]n—N wherein said pendant chains originate at ammonium nitrogen atoms in other polymer chains, wherein n has a value from 0 to any higher integer,
wherein group Y is an n-alkylene group or an alkyl substituted n-alkylene group, wherein said n-alkylene group or said alkyl substituted n-alkylene group has from 2 to at least 20 carbon atoms; and
group Z is a hydrocarbylene group containing from 2 to 50 carbon atoms, said hydrocarbylene group optionally substituted with one or more hydroxyl, ether, amino, thioether, keto, ester, silyl group or heterocyclic rings; and at least 25% of the ammonium nitrogen atoms are secondary ammonium nitrogen atoms,
with the result that said PFAS molecules are absorbed into said at least one crosslinked polymeric ammonium salt.