Method for producing an aqueous solution hydroxylamine

Details Method for producing an aqueous solution hydroxylamine Method for producing an aqueous solution hydroxylamine

2004-02-13

2008-09-16

Manoharan, Virginia (Department: 1797)

Distillation: processes, separatory

With measuring, testing or inspecting

Of temperature or pressure

C203S028000, C203S049000, C203S095000, C203SDIG016, C423S387000

Reexamination Certificate

active

07425247

ABSTRACT:
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.

REFERENCES:
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patent: 7029557 (2006-04-01), Wostbrock et al.
patent: 2001/0011633 (2001-08-01), Watzenberger et al.
patent: WO 97/22551 (1997-06-01), None

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