Bilayer polyamide desalination membrane
AssigneeNL Chemical Technology, Inc.
InventorsJohn F. Thompson, Lars Kohler, Qun Song, Jane C. Li
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Abstract
A composite reverse osmosis membrane having a semipermeable bilayer polyamide composition comprising a base layer containing a rigid crosslinked aromatic polyamide and a top layer containing a flexible aliphatic polyamide is disclosed, the two layers in combination providing reduced salt passage in reverse osmosis desalination of brackish waters and of seawater.
Claims3
A composite reverse osmosis membrane having a semipermeable bilayer polyamide composition comprising a base layer containing an aromatic polyamine-based polyamide and a top layer containing an aliphatic polyamine-based polyamide, wherein the aliphatic polyamine comprises an aminoalkylated polyacrylate of the formula
- wherein R1 is a hydrogen or a methyl group, R2 is an alkyl group having one to eight carbon atoms, X, Y and Z designate a plurality of the groups within the respective brackets, Z referring to aminoalkyl groups in a side chain, and n≥2.
Dependencies are inferred from the claim text.