Degussa Aktiengesellschaft

Degussa - Huls Ag

Josef Leutner

Manfred Schmidt

Herbert Riemenschneider

Christian Alt

Martina Claus

Ruediger Schuette

Juergen Loroesch

Stefan Schulze

Hans Peter Krimmer

Christoph Klatte

Heinz Monch

Kurt Kunz

Jurgen Lorosch

J&uuml;rgen Ohlemacher

Heinz Moench

Flowable cyanuric chloride containing hydrophilic silica as a flow auxiliary, the hydrophilic silica is a precipitated silica or silica gel having an average agglomerate diameter of less than 15 &mgr;m. Preferred products exhibit improved bulk density, reactivity and/or flowability properties.

Flowable cyanuric chloride, process for the production thereof and use thereof

A method for producing alkali metal salts or alkaline earth metal salts of 2,4-dicloro-6-hydroxy-s-triazine, especially the sodium salt, by reacting cyanuric chloride with an alkali hydroxide or alkaline earth hydroxide. 1 to 2.5 Equivalents of alkali hydroxide or alkaline earth hydroxide per mole cyanuric chloride in the form of an aqueous solution or suspension are placed in a receiver and cyanuric chloride in powder form or in the form of an aqueous suspension is added while maintaining a pH in the range of 9.5 to 14 and cooling. If less than a stoichiometric amount is added to the receiver, the remaining amount of alkali hydroxide or alkaline earth hydroxide is added during and/or after the addition of cyanide chloride, while maintaining the pH. The method can be carried out on an industrial scale and formation of the salt of monochlorodihydroxytriazine is largely avoided.

Method of producing alkali metal salts or alkaline earth metal salts of 2,4-dichloro-6-hydroxy-s-triazine

New alkali metal cyanide granulates based on sodium cyanide or potassium cyanide and a method for their preparation are disclosed. Commercially available alkali metal cyanide granulates consist of irregular particles; disadvantages are in particular the tendencies to form dust and to cake. The disclosed alkali metal cyanide granulates demonstrate a reduced tendency to cake and virtually no abrasion. The granulates are characterized by essentially spherical particles with particle diameters in the range 0.1 to 20 mm, a bulk density of more than 600 g/dm.sup.3, an abrasion of less than 1%, and a caking index of at most 4. The granulates can be prepared by fluidized bed spray granulation involving spraying an aqueous solution containing alkali metal cyanide onto alkali metal cyanide nuclei in a fluidized bed and evaporating the water.

Process for preparation of alkali metal cyanide granulates

Granulated alkali metal cyanide

Growing community of inventors

Grossheubach, Germany

Josef Leutner