Degussa Aktiengesellschaft

Detlev Koth

Dieter Kerner

Manfred Ettlinger

Hans Klebe

Edgar Simon

Horst Ferch

Josef Schmid

Manfred Schmid

Pyrogenically produced silica after separation of the hydrogen halide is mixed with nitrogen and conveyed into a cyclone. After separation of the gases, which are returned into the cooling stretch of the production apparatus, the silica is first mixed with organohalosilane and nitrogen and subsequently with steam and nitrogen. Subsequently the hydrophobization reaction is carried out in known manner in a fluidized bed reactor. The reaction waste gases are returned into the cyclone.

Process for the hydrophobization of pyrogenically produced silica

Pressed objects (slugs) of pyrogenically produced oxides such as SiO.sub.2, Al.sub.2 O.sub.3 and TiO.sub.2 are produced using a silica sol and water. As molding assistants thereby there is employed a polyhydric alcohol, e.g. glycerine or sorbitol. The water can be added adsorbed on a pyrogenically produced hydrophobized silica. The pressed object obtained can be used inter alia as catalyst carrier.

Process for the production of slugs of pyrogenically produced oxides

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Grenzach-Wyhlen, Germany

Detlev Koth