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AssigneeDomo Caproleuna GmbH
InventorsNorbert Leetsch, Thomas Strecker, Manfred Kretschmar, Joachim Seidler
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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.
A method for producing an aqueous solution of free hydroxylamine (HA) using simultaneous countercurrent treatment of an aqueous HA salt solution with ammonia or ammonia water at a process temperature, separating the solution obtained by distilling into aqueous solutions of HA and a salt fraction under a pressure above the atmospheric pressure, reconcentrating by distilling the aqueous HA solution in the countercurrent with a strip medium in a reactive distillation column with a liquid-phase evaporator, wherein the stripping medium is a mixture of steam and a non-condensable inert gas and controlling the process temperature at a defined pressure by the quantity of non-condensable inert gas at the column inlet.
Dependencies are inferred from the claim text.