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Daniel Siraux

Louis Fouarge

Eric Damme

Olivier Miserque

Renaud Oreins

Aurélien Vantomme

Daan Dewachter

Philippe J Bodart

Etienne Laurent

Philippe Marechal

Hugo Vandaele

Marc Moers

Marc Van Der Auwera

Pascal Folie

Frans Van Den Brande

Carl Van Camp

Mark Verleysen

Giacomo Conti

Leopold D'Hooghe

Marjan Sillis

Kai Hortman

Andre Lewalle

Alain Van Sinoy

Alvaro Fernandez

Jean-Léon Gielens

Mieke Dams

Alain Brusselle

Jerome Bette

André Lewalle

Martine Slawinski

Alain Standaert

Olivier Lhost

Christopher Willocq

David Ribour

Ludovic Horion

Jerôme Bette

The present invention relates to a process for the preparation of ethylene polymers using a number of reactors arranged in series comprising the steps in which Advantage of the process of the present invention is mainly to decrease catalyst consumption for the same polyethylene production, in other words to increase the productivity. In a most preferred embodiment the process of the present invention is carried out in two loop reactors under slurry conditions.

Process for the preparation of ethylene polymers using a number of reactors arranged in series

The present invention relates to an apparatus and process for polymerizing olefins. One embodiment comprises polymerizing at least one monomer in a first loop reactor in the presence of a catalyst to produce a first polyolefin fraction. A portion of the first polyolefin fraction is transferred to a second loop reactor, connected in series with the first loop reactor. The process further comprises polymerizing in the second loop reactor at least one monomer in the presence of a catalyst to produce a second polyolefin fraction in addition to the first polyolefin fraction. The combination of the first and second polyolefin fractions can produce a polymer resin fluff having bimodal molecular weight distribution.

Double loop technology

A high-density polyethylene (HDPE) can be adapted for the manufacture of caps and closures. The caps and closures can be used as screw-on caps for carbonated or still drinks. The high-density polyethylene can have a density of at least 940 kg/mand of at most 970 kg/m, and a high load melt index HLMI of at least 35 dg/min and of at most 180 dg/min. The high-density polyethylene can include a first polyethylene fraction and a second polyethylene fraction. The first polyethylene fraction can have a density of at least 920 kg/mand of at most 945 kg/m, and a melt index HL275 of at least 3 dg/min and of at most 12 dg/min. The second polyethylene fraction can have a density of at least 960 kg/mand of at most 980 kg/m.

High-density polyethylene for caps and closures

A process for preparing a polyethylene resin having a multimodal molecular weight distribution in at least two loop slurry reactors connected in series can include polymerizing ethylene in the presence of at least one supported metallocene catalyst, a diluent, optionally one or more co-monomers, and optionally hydrogen, thereby obtaining the polyethylene resin. The supported metallocene catalyst can have a particle size distribution of a span value lower than 2.5 and a D50 value within the range of from 5 &#x3bc;m to 20 &#x3bc;m.

Process for preparing a polyethylene resin

A process of preparing a polyolefin in a loop reactor in the presence of antifouling agent can include feeding into the loop reactor diluent, monomers, optionally hydrogen, and optionally one or more co-monomers to produce a liquid phase. Antifouling agent and catalyst can be introduced into the loop reactor. The process can include polymerizing the monomers and optional co-monomers to form the polyolefin. The process can be characterized in that a time difference between introduction of the antifouling agent and introduction of the catalyst is at most 3 hours. The process can be characterized in that the catalyst is introduced into a liquid phase when a concentration of the antifouling agent ranges from 0 ppm to less than 0.3 ppm.

Process for preparing polyolefins and use of antifouling agents therein

The present invention relates to a process of preparing a polyolefin in a loop reactor by introducing anti-fouling agent in by-pass pipes. Also, the invention relates to the use of anti-fouling agent to prevent blockage by feeding the anti-fouling agent into the by-pass pipes of the loop reactor.

Process for preparing polyolefins

The invention relates to a process for preparing polyolefin in a loop reactor. The polymer is prepared by polymerizing olefin monomers in the presence of a catalyst to produce a polyolefin slurry while pumping said slurry through said loop reactor by means of a pump. The present process is characterized in that the catalyst is fed in the loop reactor at a distance to the pump. The invention allows production of the polymer with advantageous properties while leading to fewer blockages of the reactor.

Reactor for preparing polyolefin

The present invention relates to a method for initiating an ethylene polymerization reaction in an ethylene polymerization loop reactor. More particularly, the invention relates to the timing upon which hydrogen is introduced into the ethylene polymerization loop reactor. The catalysts used in the ethylene polymerization reaction according to present invention are preferably metallocene catalysts.

Method for improving ethylene polymerization reactions

The present invention relates to a process of preparing a polyethylene in a loop reactor in the presence of antifouling agent comprising the steps of:

The present invention relates to a process of preparing a polyolefin in a loop reactor by introducing anti-fouling agent through a sleeve provided around at least part of the shaft of the pump. Also, the invention relates to the use of anti-fouling agent to prevent or reduce fouling by feeding the anti-fouling agent against the impeller of the pump upon introduction to the loop reactor.

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Naast, Belgium

Daniel Siraux