Basell Polyolefine Gmbh

Basf Aktiengesellschaft

Peter K&ouml;lle

Paulus De Lange

Andreas Deckers

Guido Funk

Marc Oliver Kristen

Kaspar Evertz

Ulrich Moll

Ursula Rief

Hans-Jacob Feindt

Thomas Letzelter

Laurent Deloux

Patrik M&uuml;ller

Thomas Brauch

Michael K&auml;mmerer

In a process for producing Phillips catalysts in which an oxidic support material is treated in suspension with a chromium salt solution and subsequently, after removing the solvent, calcined in an oxygen-containing atmosphere at above 300&deg; C., the oxidic support material and/or the catalyst after calcination are/is, according to the present invention, comminuted until a mean particle size of <100 &mgr;m has been reached and the proportion of particles having a size of <50 &mgr;m is at least 30%, preferably in the range from 40 to 80%. A process for preparing homopolymers or copolymers of ethene in a loop reactor at from 30 to 150&deg; C. under a pressure in the range from 0.2 to 15 MPa in the presence of a catalyst produced by the process of the present invention is also provided.

Method for producing Phillips catalysts for polymerizing olefins with better productivity rates in the particle-form process

Method for producing a supported catalyst system

Method for the discontinuous thermal treatment of catalyst material

Optimized method for the production of catalyst supports based on silica gel and chromium catalysts supported on silica gel

The invention relates to a method for producing supported chromium catalysts for the polymerisation of olefins by loading a xerogel support with chromium by adding to the xerogel support a volume of a 0.025 to 15% by weight solution of a chromium compound or a volume of a solution comprising from 0.025 to 7.8% by weight of Cr which is essentially converted into a chromium(VI) compound on heating in a water-free stream of gas under oxidizing conditions at temperatures in the range from 300 to 1100&deg; C. for a period of from 10 to 1000 minutes in a solvent which comprises a maximum of 20% by weight of water, and subsequently evaporating the solvent, where the volume of the chromium salt solution employed is smaller than the pore volume of the xerogel support.

Method for producing supported chrome catalysts and the use thereof for the polymerization of olefins

Non self-igniting solid

Growing community of inventors

Bad Dürkheim, Germany

Peter Kölle

Growing community of inventors

Bad Dürkheim, Germany

Peter K&ouml;lle

Peter Kölle