Basell Polyolefine Gmbh

Michael Aulbach

Gerhardus Meier

Harald Prang

Reinhard Kuehl

Process for the preparation of a polyolefin polymer by continuously polymerizing one or more olefin monomers in suspension at temperatures of from 40&#xb0; C. to 120&#xb0; C. and pressures of from 0.1 to 10 MPa in the presence of a polymerization catalyst in at least one polymerization reactor, comprising a) withdrawing a suspension of solid polyolefin particles in a suspension medium from the polymerization reactor, wherein the suspension has a temperature of from&#xb0; C. to 120&#xb0; C.; b) feeding the suspension withdrawn from the polymerization reactor to a moderating vessel; c) keeping the suspension in the moderating vessel at a temperature of from 60&#xb0; C. to 85&#xb0; C. for a time sufficiently long that the mean residence time of the suspension in the moderating vessel is at least 5 min; d) withdrawing suspension from the moderating vessel; e) cooling the suspension withdrawn from the moderating vessel to a temperature of from 20&#xb0; C. to 55&#xb0; C.; and f) mechanically separating the solid polyolefin particles from the liquid suspension medium, and method for controlling the content of hydrocarbons with from 14 to 300 carbon atoms in a polyolefin polymer prepared by polymerizing one or more olefin monomers in suspension.

Process for the preparation of a polyolefin polymer with improved wax deposition

Process for the preparation of a multimodal polyolefin polymer at temperatures of from 40 to 150&#xb0; C. and pressures of from 0.1 to 20 MPa in the presence of a polymerization catalyst in a first and a second polymerization reactor connected in series, wherein further polymerization reactors can be connected to said reactors upstream or downstream of said reactors, in which in the first polymerization reactor a first polyolefin polymer is prepared in suspension in the presence of hydrogen and in the second polymerization reactor a second polyolefin polymer is prepared in the presence of a lower concentration of hydrogen than in the first polymerization reactor, comprising

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Swisttal-Heimerzheim, Germany

Michael Aulbach