Abstract: A method of producing hydroxylammonium salts by catalytic reaction of nitrogen monoxide with hydrogen in a diluted aqueous solution of mineral acid in the presence of platinum catalysts suspended on a support in multiple subsequent reaction stages. This reaction takes place in a stirred reactor wherein a gas inlet and distribution system is provided in the lower part of the stirred reactor, a disk agitator is placed immediately above, the hub with bearing surface or support mounting angled, concave and tilted agitator blades that rotate their angled or concave sides in the direction of motion, and a two-blade agitator is provided on the agitator shaft in the upper part of the stirred reactor, its individual leaves being offset like lamellas so that they constantly wet the reactor cap when rotating.
Type:
Grant
Filed:
July 28, 2004
Date of Patent:
October 27, 2009
Assignee:
Domo Caproleuna GmbH
Inventors:
Wolfgang Löbel, Thomas Strecker, Joachim Seidler
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.
Type:
Grant
Filed:
February 13, 2004
Date of Patent:
September 16, 2008
Assignee:
Domo Caproleuna GmbH
Inventors:
Norbert Leetsch, Thomas Strecker, Manfred Kretschmar, Joachim Seidler
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.
Type:
Application
Filed:
February 13, 2004
Publication date:
February 16, 2006
Applicant:
DOMO Caproleuna GmbH
Inventors:
Norbert Leetsch, Thomas Strecker, Joachim Seidler