Basell Poliolefine Italia S.r.l.

Basell Polyolefine Gmbh

Basell Poliolefine Italia, S.p.a.

Equistar Chemicals, LP

Gabriele Mei

Pietro Baita

Massimo Covezzi

Giuseppe Penzo

Antonio Mazzucco

Gerhardus Meier

Roberta Pica

Enrico Balestra

Lorella Marturano

Ulf Schueller

Maria Di Diego

Giulia Mei

Gerben Meier

Tiziana Caputo

Stefano Bertolini

Giampiero Morini

Anteo Pelliconi

Joachim T M Pater

Riccardo Rinaldi

Antonio De Lucia

Angelo Lonardo

Tiziano Dall'Occo

Dario Liguori

Daniele Bigiavi

Davide Tartari

Maurizio Dorini

Paola Massari

Gianni Vitale

Rainer Karer

Roberto Pantaleoni

Guido Funk

Harilaos Mavridis

Diego Brita

Mara Destro

Jens Wiesecke

Piero Gessi

Guiseppe Penzo

Andreas Maus

Maria Silvia Tonti

Antonio Ciarrocchi

Paolo Ferrari

Gilberto Moscardi

Silvia Soffritti

Gianpiero Ferraro

Nicolò Arich De Finetti

Stefan Ziegler

Rosario Pesare

Emanuele Azzarello

Joachim Pater

Christian Ulrich Schmidt

Ricardo Rinaldi

Nicolo' Arich De Finetti

Joachim T Pater

TM Joachim Pater

A process for preparing an olefin polymer, including the steps of forming a particulate olefin polymer in a gas-phase polymerization reactor in the presence of a C-Calkane as polymerization diluent, separating discharged polyolefin particles from concomitantly discharged gas at a pressure from 1 to 2.2 MPa, degassing the polyolefin particles at a pressure from 0.1 to 0.4 MPa with a gas made from or containing a C-Calkane; and transferring the separated gas and the gas from the degassing to a work-up unit operated at a pressure from 0.001 to 0.2 MPa below the pressure of the separation, wherein the gas for degassing is continuously received from the work-up unit.

Polymerization process including discharging polyolefin particles from a gas-phase polymerization reactor

Propylene ethylene random copolymer

Fluidized-bed reactor for the gas-phase polymerization of olefins including a gas distribution grid installed in a lower part of the fluidized-bed reactor and a gas recycle line, which is equipped with a compressor and a heat exchanger and which is connected at the upper end with the top of the fluidized-bed reactor, wherein the gas recycle line splits at the lower end in at least two horizontal branches which are connected tangentially with the fluidized-bed reactor below the gas distribution grid and a process for preparing an olefin polymer carried out in the fluidized-bed reactor.

Fluidized-bed reactor having multiple recycle gas inlet nozzles

Process for the preparation of heterophasic propylene copolymer compositions (RAHECO) made from or containing a random propylene copolymer (RACO) and an elastomeric propylene copolymer (BIPO), the process being carried out in a reactor having two interconnected polymerization zones, a riser and a downcomer, wherein growing polymer particles:

Process for gas-phase polymerization of olefins

A process for preparing an ethylene polymer including the step of homopolymerizing ethylene or copolymerizing ethylene with one or more comonomers in a gas-phase polymerization reactor including a riser unit wherein growing polymer particles flow upwards under fluidization, fast fluidization or transport conditions and a downcomer wherein growing polymer particles flow downward in a densified form, wherein the hold-up of polymer particles in the downcomer is from 55 wt. % to 80 wt. % of the total hold-up of polymer particles in the gas-phase polymerization reactor.

Olefin polymerization process in a gas-phase reactor comprising a riser unit and a downcomer

A fluid is fed into a polymer bed of a fluidized bed gas phase polymerization reactor by introducing the fluid into the polymer bed through a distributor protruding into the fluidized bed zone of the reactor and terminating with a discharge end positioned so that the following equation is fulfilled:&#x3e;0.002wherein d is the distance of the distributor's discharge end from the wall of the reactor, and D is the diameter of the reactor in the fluidized bed zone.

Method for feeding a fluid to a gas phase polymerization reactor

The present disclosure generally relates to ethylene alpha-olefin copolymers and methods of making ethylene alpha-olefin copolymers. The ethylene alpha-olefin copolymers may have a density of about 0.915 g/mL to about 0.918 g/mL, a rheological polydispersity index greater than 0.8, a melt index of about 0.4 dg/10 min to about 2.0 dg/10 min, and/or a CEF Tof 84&#xb0; C. or less. The ethylene alpha-olefin copolymers may be made by combining an ethylene monomer and one or more alpha-olefin monomers in the presence of a catalyst, such as a Ziegler-Natta catalyst.

Ethylene alpha-olefin copolymers and methods

A process for the preparation of polyolefins carried out in the presence of an antistatic composition made from or containing: a) a compound of formula R&#x2014;OH wherein R represents hydrogen or a linear or branched, saturated alkyl group having from 1 to 15 carbon atoms; and b) an oligomeric or polymeric organic compound having one or more terminal hydroxyl groups and a viscosity at 40&#xb0; C. of at least about 20 mm/sec (DIN 51562).

Olefin polymerization process in the presence of antistatic composition

A gas-phase process for the homopolymerization or copolymerization of olefins carried out in the presence of a catalyst system formed by a contacting, in a liquid hydrocarbon and in the presence of hydrogen, (a) a solid catalyst component comprising Ti, Mg, and Cl, and optionally an internal electron donor compound, (b) an aluminum alkyl compound and optionally (c) an external donor compound.

Process for the polymerization of olefins

A process for starting a multizone circulating reactor containing no polyolefin particles, comprising the steps of conveying gas through the reactor and the gas recycle line, feeding a particulate material comprising a polymerization catalyst and optionally polyolefin into the reactor, controlling the gas flow in a vertical reactor zone equipped with a throttling valve at the bottom so that the upwards gas velocity in the bottom part of this reaction zone is lower than the terminal free-fall velocity of the particulate material fed into the reactor, and, after the weight of the particulate polyolefin in this reactor zone is higher than the drag force of the upward moving gas, controlling the circulation rate of the polymer particles within the multizone circulating reactor by adjusting the opening of the throttling valve and adjusting the flow rate of a dosing gas.

Process for start-up of a multizone circulating reactor

The present technology relates to a method of introducing a supported antistatic compound that does not comprise a transition-metal-based catalyst component for use in an olefin polymerization reactor. In some embodiments, the methods disclosed herein avoid the formation of polymer agglomerates in the reactor and minimize potentially negative effects on catalyst yield.

Method for improving the operability of an olefin polymerization reactor

Process for preparing a polyolefin polymer comprising the steps of

Process for degassing and buffering polyolefin particles obtained by olefin polymerization

The present disclosure provides a gas-phase polymerization process for preparing polyethylene, wherein halogenated alcohols in combination with a Ti based catalyst component and aluminum alkyls as co-catalyst suppress ethane formation or increase polymerization activity.

Process for the polymerization of ethylene

The present disclosure provides a catalyst system made from or containing: (A) a solid catalyst component made from or containing (i) a titanium compound supported on a magnesium dichloride; (B) an aluminum alkyl compound; and (C) a halogenated organic ester of formula A-COOR, wherein R is a C-Chydrocarbon group and A is a C-Csaturated or unsaturated hydrocarbon group in which at least one of the hydrogen atoms is replaced by a chlorine atom. The present disclosure also provides a process for preparing an olefinic polymer, including a polymerization step of polymerizing an olefin in the presence of the catalyst system. The present disclosure also provides an olefinic polymer made therefrom.

Catalyst for the polymerization of olefins

A process for the preparation of ethylene polymers comprising polymerizing ethylene, optionally with one or more &#x3b1;-olefin comonomers, in the presence of: (i) a solid catalyst component comprising titanium, magnesium, halogen and optionally an internal electron-donor compound, (ii) an aluminum alkyl compound, and (iii) an antistatic compound selected among the hydroxyesters with at least two free hydroxyl groups, wherein the weight ratio of aluminum alkyl compound to solid catalyst component is higher than 0.80 and the weight ratio of antistatic compound to aluminum alkyl compound is higher than 0.10.

Process for the preparation of ethylene polymers

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Ferrara, Italy

Gabriele Mei