C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 209/84 (2006.01) C07C 211/09 (2006.01)
Patent
CA 2718258
By a method for producing a diamine comprising the step of purifying a diamine from an aqueous solution containing a diamine salt, the method comprising a step of adding an alkaline substance to the aqueous solution and then filtering the resulting solution by allowing the solution to pass through a nanofiltration membrane to remove the salt, thereby obtaining an aqueous diamine solution, a diamine suitable as a raw material for a polyamide can be obtained by a simpler operation than by a conventional extraction operation with an organic solvent.
L'invention concerne un procédé de fabrication d'une diamine, qui comprend l'étape de purification d'une diamine à partir d'une solution aqueuse contenant un sel de diamine. Le procédé comprend spécifiquement l'ajout d'une substance alcaline à la solution aqueuse, puis la filtration de la solution aqueuse par un film de nanofiltration pour éliminer le sel et obtenir par conséquent une solution aqueuse de diamine. Selon l'invention, une diamine appropriée en tant que matériau de départ pour un polyamide peut ainsi être obtenue par une opération plus simple qu'une opération d'extraction classique avec un solvant organique.
Ito Masateru
Kato Koya
Mimitsuka Takashi
Minegishi Shin-Ichi
Nakagawa Izumi
Smart & Biggar
Toray Industries Inc.
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