An aqueous solution of a sodium salt of hedta

Details An aqueous solution of a sodium salt of hedta An aqueous solution of a sodium salt of hedta

C - Chemistry, Metallurgy

07

C

C07C 229/26 (2006.01) B01D 61/44 (2006.01)

Patent

CA 2533323

The invention pertains to an aqueous solution of a sodium salt xNa+ yH+ of the chelating compound of formula (I): wherein x = 2.1 - 2.7, y = 0.9 - 0.3, and x + y = 3. The invention further pertains to a container comprising at least 0.5 kg of said aqueous solution and to a method of preparing an aqueous solution comprising at least 45wt% of the sodium salt xNa+ yH+ of the chelating compound of formula (I) from Na3-~HEDTA, comprising the steps of electrodialysing an aqueous solution containing less than 42 wt% of Na3-HEDTA using a bipolar membrane, thereby converting the trisodium salt solution to the solution of the sodium salt of formula (I) with x = 2.1 - 2.7, y = 0.9 - 0.3, and x + y = 3.

L'invention concerne une solution aqueuse d'un sel de sodium t xNa?+¿ yH?+¿ du composé de chélation de la formule (I) dans laquelle x = 2,1 2,7, y = 0,9 0,3 et x + y = 3. L'invention concerne également un contenant comprenant au moins 0,5 kg de ladite solution aqueuse et un procédé de préparation d'une solution aqueuse contenant au moins 45 % en poids du sel de sodium xNa?+¿ yH?+¿ du composé de chélation de la formule (I) à partir de Na¿3?-HEDTA, comprenant les étapes consistant à électrodialyser une solution aqueuse contenant moins de 42 % en poids de Na¿3?-HEDTA à l'aide d'une membrane bipolaire, convertissant ainsi la solution de sel de trisodium en solution du sel de sodium de la formule (I) avec x = 2,1 - 2.7, y = 0,9 0,3 et x + y = 3.

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