Abstract: The invention relates to a chamber for the crystallization of solid catalyst carrier. The chamber is provided with an acoustic generator (9) for loosening the carrier from the walls of the chamber.

Abstract: The invention relates to a chamber for the crystallization of solid catalyst carrier. The chamber is provided with an acoustic generator (9) for loosening the carrier from the walls of the chamber.

Abstract: The active carrier particles of even size of the polymerization catalyst are prepared so that a melt of a complex composition is provided having the formula (I)MgCl.sub.2 nROH mED (I)in which ROH depicts an aliphatic alcohol, R is a C.sub.1 -C.sub.6 alkyl, ED depicts an electron donor, n is 1 to 6 and m is 0 to 1; the melt provided is fed to a nozzle (4); the melt is sprayed from the nozzle (4) to the spraying area (5), in which it is divided into fine melt droplets and possibly partly solidifies; the possibly partly solidified melt particles are transferred to a cooled crystallization area (6), where they crystallize to solid carrier particles; and the solid carrier particles are recovered. The melt mentioned is sprayed through a nozzle (4), which is rotated or which has attached to it a member that rotates and throws melt outwards from the rotating center to the spraying area (5).

Abstract: A method for the preparation of a solid procatalyst suitable for the polymerization of olefins wherein the procatalyst comprises a transition metal compound reacted with a carrier by carrying out in the method the following consecutive steps: (a) feeding the transition metal compound and particles of the carrier into a vessel, which in its initial position has an essentially horizontal bottom sieve, (b) mixing and reacting the metal transitional compound and the particles of the carrier to produce raw procatalyst particles and a liquid reaction residue, (c) removing the liquid reaction residue through the bottom sieve of the vessel, (d) washing the raw procatalyst particles with a washing liquid, so that impurities in the raw procatalyst are removed through the bottom sieve, (e) drying the washed raw procatalyst particles by conducting an inert gas therethrough to give the solid procatalyst, and (f) removing the solid procatalyst from the vessel.