Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissments Michelin

Compagnie Generale Des Etablissements

Pierre Kiener

Margarita Dorato

Helene Parola

Julien Thuilliez

Fanny Barbotin

Rokhiyatou Said-Diatta

Jérôme Dussillols

Leyla Pehlivan

Jean-Philippe Rasigade

Lionel Flesinski

Bernard Anselme

Elodie Guerin

Fabrice Martinet

Hélène Parola

A continuous method for producing a diene elastomer is provided. The method comprises a polymerization reaction of a catalytic system with at least one conjugated diene monomer to be polymerized in solution in a solvent. The catalytic system is based on at least a rare earth organic salt and an alkylating agent, in at least two full polymerization reactors in series. A portion of the conjugated diene monomer to be polymerized is introduced into a polymerization reactor subsequent to the first polymerization reactor.

Continuous method for producing a diene elastomer

A process for the continuous synthesis of a diene elastomer by n reactors r1 to rn, n ranging from 2 to 15, is provided. The reactor r1 is fed by an input solution comprising a solvent, one or more monomers, an anionic polymerization initiator and a polar agent, one or more of the reactor(s) r2 to rn also being fed by reinjection of a purified solution comprising solvent and/or monomer(s), the purity of the or of each reinjected solution being such that the proportion of the number of dead chains in the output stream from the reactor rn is less than 30%, of the number of living chains initiated in the reactor r1, the temperature of each reactor ranging from 20 to 150&#xb0; C. and being greater than or equal to the temperature of the reactor which immediately precedes it, the diene elastomer having a polydispersity index of 1.1 to 2.

Process for the continuous polymerization of a diene elastomer

A process for the continuous synthesis of diene elastomers with a high degree of conversion is provided. The process includes simultaneously:

Process for continuous synthesis of a diene elastomer

Process for the recovery of diene or vinylaromatic monomers from a gas stream, including bringing the gas stream into contact, in an extraction column (C), with an organic extraction solvent, which absorbs the monomer, and stripping or desorption with an inert gas in (C), by feeding, at the bottom of (C) below the feeding of the monomers, a stream of inert gas, a liquid stream having the extraction solvent and the monomer recovered at the bottom of (C) and an exiting gas stream recovered at the top of (C), then within a second recovery column Crecovery of the monomer, wherein the monomer is separated from the extraction solvent by distillation fed with the liquid stream recovered at the bottom of (C), a stream comprising concentrated monomer(s) recovered at the top of (C) and a liquid stream having the extraction solvent recovered at the bottom of (C) and then recycled to the top of (C), the monomer or monomers being dienes, vinylaromatic compounds, or isobutene.

Recovery of monomers

The invention relates to a process for preparing a rare-earth organophosphate in the form of a fluid or not very viscous solution that can be used as is for the preparation of a 'preformed' catalyst system intended, in particular, for the cis-1,4 stereospecific polymerization of conjugated dienes.

Method for synthesising a rare earth organophosphate and use thereof to prepare a 'preformed' catalytic system

The present invention relates to a process for the continuous preparation of a catalytic system that can be used for the polymerization of at least one conjugated diene monomer, said catalytic system being based on at least:

Method for the continuous preparation of a catalytic system that is used to polymerize a conjugated diene and installation for implementing same

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Clermont-Ferrand, France

Pierre Kiener