Solvay (societe Anonyme)

Abel Grosjean

Helmut Derleth

Process for the production of a microspheroidal powder of low dispersity, according to which a hydrogel is prepared, an aqueous suspension of the ground hydrogel is subjected to atomisation in a stream of gas, gelled particles containing moisture are collected from the atomisation, the particles are brought into contact with an organic liquid in order to remove at least some of the moisture and the particles are then subjected to drying. The process applies to the production of silica powders intended to serve as support for chromium oxide catalysts which may contain titanium oxide and are suitable for the polymerisation of ethylene.

Process for the production of a microspheroidal powder of low

Process for the polymerization of alpha-olefins in the presence of a catalyst, including providing monodisperse microspheroidal particles by spraying an electrostatically charged gellable liquid material (L) through a spraying orifice and into a chamber, so as to produce macrodrops which break up into microdrops which fall in the chamber and within which gelling is produced after spraying; providing a catalyst for the polymerization of alpha-olefins which contains chromium and which is supported on the monodisperse microspheroidal particles; and polymerizing alpha-olefins in the presence of the catalyst.

Process for the polymerization of alpha-olefins

Process for obtaining monodisperse microspheroidal particles, comprising spraying an electrostatically charged gellable liquid material through a spraying orifice and into a chamber, so as to produce macrodrops which break up into microdrops which fall in the chamber and within which gelling is produced after spraying. The microspheroidal particles thus obtained can be collected on a solid surface or preferably in a liquid medium and find application in the manufacture of silica-based microspheroidal particles. These microspheroidal particles can be employed as catalyst supports for alpha-olefin polymerization.

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Brussels, Belgium

Abel Grosjean