Benzene-1 2-diol mannich bases ligands polymers and method...

C - Chemistry – Metallurgy – 07 – C

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C07C 215/50 (2006.01) B01J 39/18 (2006.01) B01J 45/00 (2006.01) C02F 1/42 (2006.01) C02F 1/58 (2006.01) C02F 1/60 (2006.01) C02F 1/68 (2006.01) C07C 217/58 (2006.01) C07D 295/096 (2006.01) C07F 5/06 (2006.01) C07F 7/02 (2006.01) C08G 73/06 (2006.01)

Patent

CA 2439634

A complexing ligand for forming a complex with a cation, the ligand comprising an aromatic component including two or more attachment sites for the cation, an optionally substituted amine, such as an aminoalkylene group, and a hydrocarbon chain of from 1 to 12 carbon atoms in length. The amine component of the ligand is capable of taking on an internal counterion (H+) so that the complex of the target cation and ligand has an overall neutral charge. Such ligands can be used to extract a target cation or cations from an aqueous solution. This has particular application for the separation of aluminium and silicon in aqueous liqors in a Bayer process. The ligand can be a simple compound formed by the Mannich condensation of catechol with formaldehyde and an amine. The ligand may alternatively be a bis-ligand, a polymer or an ion exchange resin. A range of new compounds and intermediates are also described.

L'invention concerne un ligand complexant servant à former un complexe avec un cation. Ce ligand comprend un composé aromatique pourvu d'au moins deux sites d'attachement du cation, un amine substitué facultativement, tel qu'un groupe d'aminoalkylène, et une chaîne d'hydrocarbures dotée de 1 à 12 atomes de carbone en longueur. Le composé d'amine du ligand peut prendre un contre-ion interne (H+), de telle manière que le complexe du cation cible et du ligand présente une charge globale neutre. On peut utiliser de tels ligands pour extraire un cation ou des cations cibles provenant d'une solution aqueuse. On utilise cette application spécifique de séparation de l'aluminium et du silicium dans des lessives aqueuses, au cours d'un processus de Bayer. Le ligand peut être un simple composé formé par la condensation de Mannich de pyrocatéchol avec un formaldéhyde et un amine. Le ligand peut être, de manière alternative, un bis-ligand, un polymère ou une résine d'échange d'ions. Cette invention concerne également une gamme de nouveaux composés et d'intermédiaires.

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