Process for the preparation of pulverulent heterogeneous substances

Abstract

A suspension, dispersion or emulsion is introduced into a burner. An optionally two-stage after-treatment is then carried out. The resulting powder can be employed as a catalyst.

1 . A process for the preparation of pulverulent heterogeneous substances, characterised in that a dispersion, suspension or emulsion is introduced into a turbulent or laminar burner, this dispersion, suspension or emulsion is treated there under the conditions established there, the resulting reaction mixture is introduced into a downstream flow-through tube, the powder is treated further there, the powder is subsequently fed, optionally, to a washer, a separator or a filter, subjected, optionally, to a further treatment there, and subsequently transported further via an appropriate device  
     
     
         2 . A process and device according to  claim 1 , characterised in that the dispersion, suspension or emulsion is present in the high temperature flow reactor as a gas-borne group of particles.  
     
     
         3 . A process and device according to  claim 1  and  2 , characterised in that the high temperature flow tube is heated by an exothermic combustion reaction which takes place in the tube.  
     
     
         4 . A process and device according to  claim 1  and  2 , characterised in that the high temperature flow tube is heated by feeding in non-combustible hot gases.  
     
     
         5 . A process and device according to  claim 1  and  2 , characterised in that the high temperature flow reactor is heated indirectly by heating up the walls adjacent to the reaction space.  
     
     
         6 . A process and device according to  claim 1  and  2 , characterised in that the high temperature flow tube is heated by electrical plasma and/or inductive plasma.  
     
     
         7 . A process and device according to  claim 1  to  6 , characterised in that a high-energy laser light beam and/or microwave energy is additionally fed to the high temperature flow reactor.  
     
     
         8 . A process and device according to  claim 7 , characterised in that, in addition to the dispersion, suspension or emulsion, non-combustible reactive gases or vapours are fed to the high temperature flow reactor, the reaction product being a highly disperse nanostructured solid which adds on to the surface of the particles of the dispersion or suspension.  
     
     
         9 . A process and device according to  claim 8 , characterised in that the reaction product forms homogeneous molecular layers on the particles of the dispersion or suspension, the particles of the dispersion or suspension thus being coated with a mono- or multimolecular layer.  
     
     
         10 . A process and device according to  claim 8 , characterised in that the non-combustible reactive gases or vapours are metal chlorides and/or organometallic compounds, as well as mixtures of these compounds.  
     
     
         11 . A process and device according to claim  1 - 10 , characterised in that the temperature in the reaction space is above 1000° C.  
     
     
         12 . A process and device according to claim  1 - 10 , characterised in that the suspension is fed to the reaction space axially in co- or countercurrent or radially.  
     
     
         13 . A process and device according to claim  1 - 10 , characterised in that the dispersion or suspension is fed to the reaction space radially.  
     
     
         14 . A pulverulent substance obtainable by a process according to claim  1 - 13 .  
     
     
         15 . The use of a pulverulent substance according to  claim 14  as a catalyst.  
     
     
         16 . The use of a pulverulent substance according to  claim 14  as an oxygen store, NO x  store, C n H m  store for catalysis and adsorbents.  
     
     
         17 . The use of a pulverulent substance according to  claim 14  for the production of ductile ceramic components.  
     
     
         18 . The use of a pulverulent substance according to  claim 14  for the production of components with a quantum mechanics activity, in particular sensors, and photoelectrically active emitters.  
     
     
         19 . The use of a pulverulent substance according to  claim 14  for the production of glasses and glass ceramic.