A METHOD FOR ANION-EXCHANGE ADSORPTION AND ANION-EXCHANGERS

摘要

A method for the removal of a substance carrying a negative charge and beingpresent in an aqueous liquid (I). The method comprises the steps of: (i)contacting the liquid with a matrix carrying a plurality of ligands comprisinga positively charged structure and a hydrophobic structure, and (ii) desorbingthe substance. The characterizing feature is that (I) each of said ligandstogether with a spacer has the formula: -- SP---[Ar-R1-N+(R2R3R4)] where (A)[Ar-R1-N+(R2R3R4)] represents a ligand a) Ar is an aromatic ring, b) R1 is[(L)nR'1]m where n and m are integers selected amongst zero or 1; L is aminonitrogen, ether oxygen or thioether sulphur; R'1 is a linker selected among 1)hydrocarbon groups; 2) -C(=NH)-; c) R2-4 are selected among hydrogen andalkyls; (B) SP is a spacer providing a carbon or a heteroatom directlyattached to Ar-R1-N+(R2R3R4); (C) --- represents that SP replaces a hydrogenin (Ar-R1-N+(R2R3R4); (D) -- represents binding to the matrix; and (II)desorption. There is also described (a) anion-exchangers having highbreakthrough capacities, (b) a screening method and (c) a desalting protocol.