Degussa Aktiengesellschaft

Degussa - Huls Ag

Lothar Kaiser

Rainer Kohlen

Birgit Bertsch-Frank

Martin Bewersdorf

Ralph Overdick

Michael Scheibe

Harald Jakob

Rudiger Schutte

Wolfgang Leonhardt

Alexander Ruhs

Juergen Lattich

Ivan Pelgrims

Waldemar Hessberger

Dietmar Tr&auml;umer

The invention relates to uncoated and/or coated sodium percarbonate with improved internal stability and storage stability; and, a process that provides uncoated and/or coated sodium percarbonate with improved internal stability and storage stability.

Process for improving the internal stability of sodium percarbonate

A process is provided for the safe storage of sodium percarbonate in a bulk container that is substantially closed to the ambient atmosphere. A temperature is measured at at least one position inside the sodium percarbonate stored in bulk and, with an increase in temperature within the range of 0.5 to 10&deg; C. per day, in particular 1 to 5&deg; C. per day, dry air is passed periodically or continuously through the bulk material until the increase in temperature has fallen to a value of less than 1&deg; C. per day in particular less than 0.5&deg; C. per day.

Process for the safe storage of sodium percarbonate in bulk containers

The invention relates to a fluidized bed reactor for the continuous production of fluidized bed granules. The reactor is characterized by a discharge device designed as a siphon pipe or siphon weir. The fluidized bed reactor permits a trouble-free continuous operation of the fluidized bed stage and of a connected, continuous subsequent stage. A preferred fluidized bed reactor comprises two chambers that are in communication via the discharge device according to the invention.

Fluidized bed reactor and a process of using the same

A process for the preparation of coated peroxygen compounds, in particular sodium percarbonate, by fluidized bed coating. By using a fluidized bed reactor with a radial inflow base, the passage openings of which allow the fluidized bed gas to emerge in the region of the opening at an angle of less than 35&deg;, measured with respect to the horizontal, in the form of directed part streams, and in which are arranged spray nozzles, the pulse of which points in the same direction as the pulse of the fluidizing gas, it is possible to obtain products with an increased active oxygen stability. A circular reactor, the inflow base of which has lamellae overlapping like turbine blades and nozzles aligned in the direction of rotation of the fluidized bed is preferred.

Process for preparation of coated peroxygen compounds

Sodium percarbonate particles stabilized against loss of active oxygen in detergents, bleaches and cleaning agents by the application of a two-layer coating applied by means of a fluidized bed spray process, the inner layer including sodium percarbonate and the outer layer including sodium sulphate.

Coated sodium percarbonate particles, process for the production thereof

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Rheinfelden, Germany

Lothar Kaiser