Method for the production of an aqueous hydroxylamine solution

Details Method for the production of an aqueous hydroxylamine solution Method for the production of an aqueous hydroxylamine solution

C - Chemistry, Metallurgy

01

B

C01B 21/14 (2006.01)

Patent

CA 2501666

This invention relates to a method for producing an aqueous solution of free hydroxylamine (HA) by simultaneous countercurrent treatment of a HA salt with ammonia or ammonia water, then separating the HA by distillation and reconcentrating the aqueous HA solution in a countercurrent with a stripping medium. The stripping medium used according to the invention is a mixture of steam and a non-condensable inert gas and the process temperature at a defined pressure is controlled by the quantity of non-condensable inert gas at the column inlet. The preferred non-condensable inert gas is nitrogen. This results in increased safety and a reduction in losses of the method for producing aqueous solutions of free HA.

L'invention concerne un procédé pour réaliser une solution aqueuse d'hydroxylamine libre (HA) en effectuant simultanément un traitement à contre-courant d'un sel de HA avec de l'ammoniac ou de l'eau ammoniacale ainsi qu'une séparation par distillation et une concentration de la solution aqueuse de HA dans le contre-courant au moyen d'un agent de stripage. L'invention est caractérisée en ce que l'agent de stripage est un mélange de vapeur d'eau et de gaz inerte non condensable et la température du processus, pour une pression déterminée, peut être régulée par la quantité de gaz inerte non condensable à l'entrée de la colonne, le gaz inerte non condensable utilisé étant de préférence de l'azote. Cette invention permet ainsi d'accroître la sécurité et de diminuer les pertes lors de la réalisation de solutions aqueuses d'hydroxylamine libre.

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