Basell Polyolefine Gmbh

Basell Poliolefine Italia S.r.l.

Basell Poliolefine Italia, S.p.a.

Equistar Chemicals, LP

Pietro Baita

Gabriele Mei

Massimo Covezzi

Roberta Pica

Lorella Marturano

Gerhardus Meier

Maria Di Diego

Ulf Schueller

Giuseppe Penzo

Giampiero Morini

Giulia Mei

Antonio Mazzucco

Daniele Bigiavi

Antonio De Lucia

Tiziano Dall'Occo

Dario Liguori

Anna Fait

Joachim T M Pater

Andreas Maus

Maria Silvia Tonti

Paolo Ferrari

Gerben Meier

Ines Mingozzi

Lorella Pedriali

Nicolo Arich De Finetti

Piero Gessi

Shahram Mihan

Gianni Collina

Bernd Lothar Marczinke

Gianni Vitale

Fabrizio Piemontesi

Anteo Pelliconi

Rainer Karer

Guido Funk

Tiziana Caputo

Diego Brita

Harilaos Mavridis

Benedetta Gaddi

Gerd Mannebach

Enea Garagnani

Elke Damm

Daniele Evangelisti

Jens Wiesecke

Riccardo Rinaldi

Enrico Balestra

Maurizio Dorini

Gianpiero Ferraro

Nicolò Arich De Finetti

Guiseppe Penzo

Harry Mavridis

Paolo Capisani

Joachim T Pater

Stefano Sessa

TM Joachim Pater

A process (and a related system) for collecting samples of a polymerization catalyst or of a catalyst-containing polymer from an operation unit, having an upper end and a lower end, of a polymerization plant, including the steps of:

Process and system for collecting catalyst or polymer samples from an operation unit of a polymerization plant

A process for the continuous solution polymerization including the step of polymerizing a first olefin monomer of formula CH═CHR, wherein Ris hydrogen or a hydrocarbon radical having from 1 to 8 carbon atoms with a second olefin monomer of formula CH═CHR, wherein Ris a hydrocarbon radical having from 3 to 8 carbon atoms, in the presence of a polymerization catalyst and in the absence of an inert solvent, at a polymerization temperature (Tp) satisfying the following relationship:20° C.wherein Tm is the melting temperature of the obtained polymer.

Continuous solution polymerization process

A process for preparation of an ethylene polymer in a gas-phase polymerization unit comprising a gas-phase polymerization reactor by homopolymerizing ethylene or copolymerizing ethylene and one or more C-C-1-alkenes in a reaction gas made from or containing propane as polymerization diluent in the presence of a pre-activated polymerization catalyst, wherein a purified propane feed stream made from or containing at least 99 mol % propane and from 0.1 to 100 ppm mol propylene is fed to the gas-phase polymerization unit.

Gas-phase process for preparing ethylene polymers

A gas-phase polymerization reactor for the gas-phase polymerization of olefins including a polymerization zone having a recycle line for (a) withdrawing reaction gas from the reactor, (b) leading the reaction gas through a heat-exchanger for cooling, and (c) feeding the reaction gas back to the reactor, wherein the recycle line has the heat-exchanger, a centrifugal compressor having variable guide vanes, and a butterfly valve, and a related process for preparing an olefin polymer in the gas-phase polymerization reactor.

Process for polymerizing olefins in the gas-phase

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

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 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

A method for feeding an antistatic compound to a polymerization reactor comprising the steps of: a) dispersing, under mixing conditions, a catalyst powder and an antistatic compound in an oil, so as to form a suspension of catalyst powder and antistatic compound in said oil; b) successively adding, under mixing conditions, a molten thickening agent to said suspension from step a), while maintaining said suspension at a temperature such that said thickening agent solidifies on contact with said suspension; c) transferring the product obtained from b) to a polymerization reactor.

Method for feeding an antistatic compound to a polymerization 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

A process for preparing a polyolefin, including polymerizing olefins in the presence of an antistatic agent made from or containing an alkylene oxide derived polymer made from or containing in average from about 10 to about 200 repeating units &#x2014;(CH&#x2014;CHR&#x2014;O)&#x2014; with R being hydrogen or an alkyl group having from 1 to 6 carbon atoms, wherein the alkylene oxide derived polymer is a random copolymer of ethylene oxide and other alkylene oxides and a ratio of n:m is in the range of from 6:1 to 1:1, wherein (n) is the average number of repeating units &#x2014;(CH&#x2014;CH&#x2014;O)&#x2014; derived from ethylene oxide and (m) is the average number of repeating units &#x2014;(CH&#x2014;CHR'&#x2014;O)&#x2014; derived from the other alkylene oxides with R&#x2032; being an alkyl group having from 1 to 6 carbon atoms, and the end groups of the alkylene oxide derived polymer are &#x2014;OH groups.

Polymerization process in the presence of antistatic agent

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Ferrara, Italy

Pietro Baita