PROCESS FOR THE PREPARATION OF A SPHERICAL SUPPORT COMPRISING A MG DIHALIDE

摘要

The present invention relates to a process for preparing spherical support particles used in the preparation of catalytic components for the polymerization of olefins. The process comprises (a) forming an emulsion of an adduct of a Mg dihalide and a compound selected from the group consisting of Lewis bases in a liquid medium, (b) cooling the emulsion by transferring it into a cooling bath containing a cooling liquid in motion; the process being characterized in that the cooling liquid is moving inside a tubular zone and the ratio ve/vref of the velocity (ve) of the emulsion coming from step (a) to the velocity of the cooling liquid (vref) is between 0.25 and 4. The obtained spherical support particles are characterized by a very narrow size distribution and particularly regular morphology.