Method for producing highly pure aqueous hydroxylamine solutions
AssigneeBASF SE
InventorsOtto Watzenberger, Heiner Schelling, Peter Pfab, Eckhard Strofer
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Abstract
A very pure aqueous solution of free hydroxylamine is prepared by a process in which the dilute, aqueous hydroxylamine solution is concentrated in a column by removing hydroxylamine-containing vapors via a side take-off in the bottom of the column, and very pure hydroxylamine is obtained by condensing the vapors. The novel process can be carried out simply, in a gentle manner and on a large scale and gives electronic grade hydroxylamine.
Claims6
A process for the preparation of very pure, aqueous hydroxylamine solution by concentrating and purifying an aqueous hydroxylamine solution, wherein the concentration is carried out in a column, hydroxylamine-containing vapors are removed via a side take-off in the bottom of the column and very pure hydroxylamine is obtained by condensing the vapors.
Dependencies are inferred from the claim text.