Basell Polyolefine Gmbh

Basell Poliolefine Italia S.r.l.

Montell North America Inc.

Basell Poliolefine Italia, S.p.a.

Montell Technology Company Bv

Giuseppe Penzo

Gabriele Mei

Giulia Mei

Riccardo Rinaldi

Pietro Baita

Maurizio Dorini

Gerhardus Meier

Massimo Covezzi

Ulf Schueller

Enrico Balestra

Silvia Soffritti

Antonio De Lucia

Antonio Mazzucco

Elke Damm

Daniele Bigiavi

Luciano Michielin

Rosario Pesare

Emanuele Azzarello

Gianni Vitale

Dieter Littmann

Gabriele Govoni

Rainer Karer

Anna Fait

Andre-Armand Finette

Christoph Wolf

Michael Deuerling

Roberto Rinaldi

Reinhard Kuehl

Maria Silvia Tonti

Antonio Ciarrocchi

Juergen Mohrbutter

Rodrigo Carvajal

Pier Luigi Di Federico

Cyrus Ahmadzade-Youssefi

Gianpiero Ferraro

Nicolò Arich De Finetti

Ulrich Nieken

Gian Luca Bonaccorsi

Dorini Maurizio

Rinaldi Riccardo

Carlo Ciccarone

Nicolo' Arich De Finetti

Sergio Sabbioni

Massimo Covessi

Antonio Gala

An apparatus for carrying out a gas-phase olefin polymerization having a first polymerization zone having a cylindrical segment of diameter D01, a second polymerization zone having a cylindrical upper part of diameter D05 and a cylindrical lower part of diameter D06, a separation zone of diameter D04, a first connecting element of diameter D03, which is a bend of radius R03 or has a bend part of radius R03, a gas recycle line of diameter D08, a transition segment of diameter D02, and a second connecting element of a diameter D09, which is a bend or has a bend part, wherein the ratio D04 to D05 is 1.0 to 1.5, the ratio D05 to D06 is 1.2 to 2, the ratio R03 to D03 is 1 to 6, the ratio D03 to D01 is 0.3 to 0.85, and the ratio D08 to D02 is 1.0 to 2.2.

Apparatus and process for the gas-phase polymerization

Apparatus for carrying out a catalytic gas-phase olefin polymerization having a first polymerization zone for growing polymer particles to flow upward under fast fluidization or transport conditions, a second polymerization zone for the growing polymer particles to flow downward, and a gas/solid separation zone; wherein the second polymerization zone has an upper part being connected to the separation zone and a lower part being connected to the upper part; wherein the ratio of the height H01 of the separation zone to the diameter D01 of the separation zone is 2.5 to 4.5.

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

Method for the preparation of dried polymer pellets in a facility having a dryer with a first chamber and a mechanical agitator, and the facility further having a degassing silo with a second chamber, the method includes the steps of guiding a drying gas flow made from or containing a first gas mixture for drying wet polymer pellets into the first chamber, transferring the dried polymer pellets into the second chamber, guiding a second gas mixture for degassing the dried polymer pellets into the second chamber thereby transforming the second gas mixture into a third gas mixture and guiding a portion of the third gas mixture into the first chamber; and process for manufacturing LDPE pellets.

Pellet drying and degassing method

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

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

A manhole for a polymerization unit having a through-hole formed with a shoulder matching a corresponding shoulder of a plug of a closure member operatively inserted in the through-hole. The through-hole can be closed with a minimum clearance, such that polymer particles do not deposit in the gap between the wall of the unit and the plug of the closure member.

Polymerization unit with improved manhole

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

Process for preparing a polyolefin polymer comprising the steps of

Process for degassing and buffering polyolefin particles obtained by olefin polymerization

A process for the preparation of polyethylene by polymerizing in a slurry ethylene and optionally one or more Cto Calpha-olefins in a reactor system comprising a polymerization reactor and one or more first heat exchangers located outside the polymerization reactor where the slurry in the polymerization reactor is cooled by withdrawing slurry from the polymerization reactor, cooling the slurry in the one or more first heat exchangers and returning the cooled slurry to the polymerization reactor, wherein the one or more first heat exchangers are cooled by a first coolant having a temperature of 29&#xb0; C. or higher.

Ethylene polymerization process having improved heat exchanger performance

Process for treating polyolefin particles obtained by gas-phase polymerization of one or more olefins in the presence of a polymerization catalyst system and a C-Calkane as polymerization diluent in a gas-phase polymerization reactor, the process comprising the steps of

Process for treating polyolefin particles obtained by gas-phase polymerization

A process for polymerizing olefins at temperatures of from 30&#xb0; C. to 140&#xb0; C. and pressures of from 1.0 MPa to 10 MPa in the presence of a polymerization catalyst in a multistage polymerization of olefins in at least two serially connected gas-phase polymerization reactors, and apparatus for the multistage polymerization of olefins, comprising at least two serially connected gas-phase polymerization reactors and a device for transferring polyolefin particles from an up-stream gas-phase polymerization reactor to a downstream gas-phase polymerization reactor, the transferring device comprising&#x2014;a gas/solid separation chamber placed downstream of the upstream gas-phase polymerization which gas/solid separation chamber is equipped at a lower part with an net for introducing a fluid, and&#x2014;connected to the gas/solid separation chamber at least two lock hoppers, placed in a parallel arrangement, each connected to the downstream gas-phase polymerization reactor.

Multistage process for the polymerization of olefins

Process for transferring polyolefin particles from a first gas-phase polymerization reactor to a second gas-phase polymerization reactor in a multistage polymerization of olefins carried out in at least two serially connected gas-phase polymerization reactors, wherein the first gas-phase reactor is a fluidized-bed reactor comprising a gas distribution grid and a settling pipe, which is integrated with its upper opening into the distribution grid and contains a bed of polyolefin particles which moves from top to bottom of the settling pipe,the process comprising the steps ofintroducing a fluid into the settling pipe in an amount that an upward stream of the fluid is induced in the bed of polyolefin particles above the fluid introduction point;withdrawing polyolefin particles from the lower end of the settling pipe; andtransferring the withdrawn polyolefin particles into the second gas-phase polymerization reactor,process for polymerizing olefins comprising such a process for transferring polyolefin particles, reactor suitable as first gas-phase polymerization reactor in the process for polymerizing olefins and process for discharging polyolefin particles from a fluidized-bed reactor.

A gas-phase polymerization reactor having interconnected polymerization zones comprising:&#x2014;a riser through which the polymer particles flow upwards under fast fluidization conditions or transport conditions;&#x2014;a downcomer through which the polymer particles flow downward in a densified form under the action of gravity, the bottom of said downcomer being connected to the lower region of said riser by means of a transport section, said transport section being designed as a bend descending from the downcomer to the riser.

Process and apparatus for the gas-phase polymerization of olefins

A process for the gas-phase polymerization of &#x3b1;-olefins carried out in two interconnected polymerization zones, wherein the growing polymer particles flow through the first of said polymerization zones (riser) under fast fluidization conditions, leave said riser and enter the second of said polymerization zones (downcomer) through which they flow downward in a densified form, the process being characterized in that: (a) the gas mixture present in the riser is totally or partially prevented from entering the downcomer by introducing into the upper part of said downcomer a liquid stream LB having a composition different from the gaseous mixture present in the riser; (b) the ratio R between the flow rate Fof polymer circulated between said downcomer and said riser and the flow rate LB of said liquid being adjusted in a range from 10 to 50.

Process for the gas-phase polymerization of olefins

Growing community of inventors

Ferrara, Italy

Giuseppe Penzo