C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 21/14 (2006.01) B01D 3/14 (2006.01) B01D 3/38 (2006.01)
Patent
CA 2239253
A process is disclosed for producing an aqueous solution of free hydroxylamine. A solution obtained by treating an hydroxylammonium salt with a base is treated with water or water vapour at a temperature ? 80 C, so as to separate the solution into an aqueous hydroxylamine fraction and a salt fraction. This process is soft and easy to implement on a Large scale. The risk of decomposition is minimised because of the low thermal stresses, the low hydroxylamine concentration and the short dwelling time during implementation of the process.
Selon ce procédé de préparation d'une solution aqueuse d'hydroxylamine libre, on sépare une solution, obtenue en traitant un sel d'hydroxylammonium avec une base, en traitant ladite solution avec de l'eau ou de la vapeur d'eau à une température égale ou supérieure à 80 DEG C, de façon à la séparer en une fraction hydroxylamine aqueuse et en une fraction saline. Ce procédé non agressif est simple à mettre en oeuvre à grande échelle. Le risque de décomposition est minimisé grâce aux sollicitions thermiques réduites, à la faible concentration en hydroxylamine et au court temps de séjour pendant la mise en oeuvre du procédé.
Friederang Albrecht Wilhelm
Leutner Bernd
Schneider Hans-Michael
Watzenberger Otto
Basf Aktiengesellschaft
Basf Corporation
Robic
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