Process for production of aqueous solutions of free hydroxylamine
AssigneeBASF SE
InventorsOtto Watzenberger, Hans-Michael Schneider, Bernd Leutner, Albrecht Wilhelm Friederang
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Abstract
An aqueous solution of free hydroxylamine is prepared by a process in which the solution obtained by treating a hydroxylammonium salt with a base is separated into an aqueous hydroxylamine solution and a salt fraction by treatment with water or steam at .ltoreq.80.degree.0 C. The novel process can be carried out in a simple and gentle manner and on a large industrial scale. Owing to the low thermal load, the low concentration of hydroxylamine and the short residence time in the process, the risk of decomposition is minimized.
Claims14
A process for the preparation of a salt-free, aqueous hydroxylamine solution, comprising
- a) mixing a hydroxylammonium salt and an inorganic base in water,
- b) separating off any insoluble components to obtain a hydroxylamine and salt containing aqueous solution, and
- c) treating the aqueous hydroxylamine and salt solution with water or steam to separate the aqueous solution into a salt-free, aqueous hydroxlamine solution and a salt solution,
- wherein the separation (c) is carried out
- c1) at .ltoreq.80.degree. C.
- c2) in a stripping column, and
- c3) the water or steam is passed counter current into the bottom of the stripping column, and wherein the salt-free, aqueous hydroxylamine solution is optionally distilled to give a concentrated hydroxylamine solution.
Dependencies are inferred from the claim text.