C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 21/14 (2006.01)
Patent
CA 2451482
The invention relates to a method for producing an aqueous hydroxylamine solution that is devoid of salt by reacting an aqueous solution of a hydroxylammonium salt with a base to obtain a mixture and by separating an aqueous hydroxylamine solution devoid of salt by distillation from said mixture. The method is characterised in that an aqueous solution of a mixture of NaOH and KOH with a molar ratio of Na+: K+ in the region of between 70: 30 and 95: 5 and a total concentration of Na+ and K+ in the region of between 0.1 and 10 m/m % (in relation to the total quantity of the mixture) is used as the base.
L'invention concerne un procédé pour produire une solution aqueuse d'hydroxylamine sans sel, consistant à faire réagir une solution aqueuse d'un sel d'hydroxylammonium avec une base pour obtenir un mélange, puis à séparer par distillation de ce mélange une solution aqueuse d'hydroxylamine sans sel. L'invention se caractérise en ce que la base utilisée est une solution aqueuse d'un mélange de NaOH et de KOH avec un rapport molaire de Na?+¿: K?+¿ compris entre 70 : 30 et 95 : 5 et une concentration totale de Na?+¿ et de K?+¿ comprise entre 0,1 et 10 m/m % par rapport à la totalité du mélange.
Kerth Steffen
Stroefer Eckhard
Weber Markus
Wostbrock Karl-Heinz
Basf Aktiengesellschaft
Robic
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