Basf Aktiengesellschaft

Friedhelm Teich

Bernd Ziegler

Heiner Schelling

Wolfgang Reichert

Martin Gall

Horst Kratzer

Herbert K&ouml;ster

Gunther Lamm

Norbert Mronga

Reinhard Kemper

Horst Colberg

Herbert Bender

Gunter Herrmann

In a process for drying microporous, fluid-containing particles, the fluid-containing particles to be dried are fed as a moving bed countercurrently to a drying fluid, the interfacial tension of the fluid being reduced in comparison with the interfacial tension of the fluid at room temperature, at near-critical to supercritical pressure of the fluid, preferably to a value in the range from 0 to in particular from 0 to of the interfacial tension at room temperature. Furthermore, microporous, three-dimensionally networked particles are prepared by a process comprising preparation of microporous particles containing pore liquid, exchange of the pore liquid in the particles for a fluid and drying of the fluid-containing particles, the exchange and drying being carried out in the moving bed by the countercurrent method.

Method for drying and producing microporous particles

In a process for drying microporous, fluid-containing particles, the heat required for increasing the temperature is supplied by convection by reducing the interfacial tension of the fluid, preferably to 0 to 1/10, in particular to 0 to 1/20, of the interfacial tension of the fluid at room temperature, by appropriately increasing the temperature at from close to the critical pressure to supercritical pressure of the fluid. Furthermore, microporous, three-dimensionally networked particles are prepared by a process in which the drying process is used. In addition, an apparatus is used for carrying out the drying process, the apparatus comprising a pressure container having an inner container and pressure-withstanding outer container and suitable measuring and control apparatuses and pump apparatuses and heat exchangers, the inner container being provided for holding the particles to be dried and a gap being provided between the inner container and the outer container.

Method for drying and producing microporous particles and a drying device

Hydrophobic silica aerogels

Aminobenzophenones have the formula ##STR1## where the ring A may be benzofused,

Aminobenzophenonesulfonic acids

Dihydroquinacridones, quinacridones and quinacridonequinones are prepared by cyclizing 2,5-dianilino-3,6-dihydroterephthalic acid derivatives or 2,5-dianilinoterephthalic acid derivatives in the liquid or solid state or in solution, in each case in finely divided form, or in the gas phase, in the presence or absence of an oxidizing agent.

Preparation of dihydroquinacridones, quinacridones and

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Edingen-Neckarhausen, Germany

Friedhelm Teich