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Louis Fouarge

Daniel Siraux

Eric Damme

Renaud Oreins

Daan Dewachter

Marc Van Der Auwera

Alain Brusselle

Carl Van Camp

Frans Van Den Brande

Philippe J Bodart

Olivier Miserque

Philippe Marechal

Marc Moers

Etienne Laurent

Hugo Vandaele

Giacomo Conti

Mark Verleysen

Pascal Folie

Andre Lewalle

Kai Hortman

Marjan Sillis

Leopold D'Hooghe

Alvaro Fernandez

Marc Richet

Eric Duchesne

Pascal Wilderiane

Geert Nauwelaerts

Annelies Horre

Frank Timmermans

Wouter Ooms

Jerome Bette

Aurélien Vantomme

Sandra Davidts

André Lewalle

Rudi Tanghe

Johan Janssens

Jerôme Bette

Carl VanCamp

Steven Beuckelaers

An apparatus may include a mud pot and a reflectometer to monitor a level of an interface between liquid diluent and catalyst slurry in the mud pot using reflectometry. The apparatus may include a mixing tank and a conduit to transfer catalyst slurry from the mud pot to the mixing tank. The apparatus may include a polymerization reactor and a conduit to provide catalyst slurry from the mixing tank to the polymerization reactor.

Method for monitoring the level of an ethylene polymerization catalyst slurry

A process for the preparation of a polyolefin is disclosed. The process includes introducing one or more olefin reactants, diluents and polymerization catalyst into a first loop reactor, and while circulating the olefin reactants, diluents and polymerization catalyst in the first loop reactor. The method includes polymerizing the one or more olefin reactants to produce a polyolefin slurry comprising liquid diluent and solid olefin polymer particles. The method includes withdrawing polyolefin slurry comprising solid olefin polymer particles and diluent from the first reactor and introducing the withdrawn particles into a second loop reactor, by means of one or more settling legs provided on the first reactor, wherein each settling leg has an inlet connected to the first reactor and an outlet connected to the second reactor by means of a transfer line wherein at least one settling leg is continuously open allowing continuous transfer of solid olefin polymer particles from the first loop reactor to the second loop reactor. The process further comprises controlling the continuous transfer of solid olefin polymer particles from the first loop reactor to the second loop reactor by at least one continuously open settling leg.

Olefin polymerization process with continuous transfer

A process for the preparation of a polyolefin in a slurry loop reactor provided with settling legs may include introducing olefin reactants, diluents, and polymerization catalyst into the reactor while circulating. The process may include polymerizing the olefin reactants to produce a slurry, continuously withdrawing the slurry, via the settling legs, and transferring withdrawn solid olefin polymer particles to a recovery section. Each settling leg may have an inlet connected to the reactor and an outlet connected to the recovery section. At least one settling leg is continuously open, allowing continuous withdrawal of slurry. Each outlet of the settling legs may be connected to the recovery section by a conduit provided with a pressure control device. The pressure in the reactor may be controlled by operating the pressure control device.

Olefin polymerization process with continuous discharging

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 process includes preparing a diluted catalyst slurry in a catalyst slurry preparation system. The diluted catalyst slurry contains solid particulate catalyst and liquid hydrocarbon diluent. The catalyst slurry preparation system includes a mixing vessel with a top part, a bottom part and a rotatable impeller system which is actuated by a motor. The rotatable impeller system has a magnetic actuated agitator shaft which is positioned along a longitudinal axis of the mixing vessel and extends through the top part of the mixing vessel. At least two double-bladed hubs are fixed to the magnetic actuated agitator shaft.

Catalyst slurry preparation system and use thereof

The present invention relates the use of a pump in a loop reactor for the production of polyethylene, as well as a reactor comprising such pump and methods for producing polyolefin by means of such reactor. The pump according to the invention is characterized in that it is an axial flow impeller circulation pump, wherein the impeller comprises 6 blades and wherein the pump is fixed on a spring supported frame. Use of the pump according to the present invention allows for preparation of homogeneous polyethylene products that meet high quality standards from the complicated ethylene polymerization mixtures while at the same time being produced with low energy consumption.

Pump for loop reactor

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 present invention relates to the use of a catalyst preparation system for the preparation of a diluted catalyst slurry. In particular, the invention relates to a catalyst preparation system comprising a mixing vessel for mixing a particulate catalyst and a liquid hydrocarbon diluent. According to the invention, diluted catalyst slurry is prepared in a mixing vessel comprising a rotatable axial impeller system comprising at least two double-bladed hubs. The invention also relates to a process for preparing diluted catalyst slurry for use in the preparation of a particulate polyethylene product in a loop reactor with the catalyst preparation system as described herein.

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 monitoring the level of an ethylene polymerization catalyst slurry in a mud pot (), whereby said catalyst slurry is prepared by introducing a solid catalyst and a liquid diluent in said mud pot (), and whereby through sedimentation an interface () is formed between said diluent and the obtained catalyst slurry, characterized in that said interface () is monitored with Time Domain Reflectometry.

Reactor and process for preparing polyolefin

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Dilbeek, Belgium

Louis Fouarge