Desalting of aqueous sulfonamide solutions

Details Desalting of aqueous sulfonamide solutions Desalting of aqueous sulfonamide solutions

C - Chemistry, Metallurgy

07

C

C07C 311/03 (2006.01) B01D 61/44 (2006.01) C07C 303/44 (2006.01) C25B 3/00 (2006.01)

Patent

CA 2246647

To eliminate salts (particularly NH4Cl) present in an aqueous sulfonamide solution (particularly CH3SO2NH2), the solution is subjected to two-compartment electrodialysis. By maintaining the pH at less than 7, the formation of ammonia is avoided. The demineralized solution can be concentrated to recover the sulfonamide following crystallization. This process can be used to carry out desalting with high yields.

Pour éliminer les sels (en particulier NH4Cl) présents dans une solution aqueuse de sulfonamide (en particulier CH3SO2NH2), on soumet la solution à une électrodialyse à deux compartiments. Par maintien du pH à une valeur inférieure à 7, on évite la formation d'ammoniac. La solution déminéralisée peut être concentrée pour récupérer, après cristallisation, le sulfonamide. Ce procédé permet de réaliser le dessalage avec des rendements élevés.

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