Enichem Elastomeri S.p.a.

Snamprogetti S.p.a.

Silvano Gordini

Antonio Carbonaro

Salvatore Cucinella

Mario Bruzzone

Agostino Balducci

Alessandro Beranger

Ken Wyllie

Stanislao Spina

A reactor for carrying out polymerizations in systems with high concentration of polymer is constituted by a cylindrical body having vertical axis with upper and lower heads; in correspondence of a generatrix of the cylinder an opening with vertical-axis is provided, which puts the interior of the cylinder in communication with the body of an extruder, it too with vertical axis, and solid with the reactor.

Reactor for polymerization in concentrated systems

This invention concerns the production of 1,4-cis polybutadiene, or copolymers of butadiene with other related diolefins, through the catalytic polymerization or copolymerization of butadiene monomer by a continuous or discontinuous process carried out in the absence or substantial absence of solvents or diluents and operating in the presence of solid bodies.

Process for the polymerization or copolymerization of butadiene in the

The invention relates to a continuous process for the manufacture of butyl rubber in which the monomers are polymerized using a halogenated polymerization medium in a self-cleaning screw extruder at a constant pressure under boiling plug-flow conditions by means of a modified aluminium halide catalyst which operates at high temperature (relative to prior art very low temperatures of e.g. -100.degree. C.). In contrast to prior art slurry processes, the polymerization mixture forms a sticky, highly viscous mass which is conveyed by screw action to the extruder outlet as polymerization proceeds. The butyl rubber product is separated at a high concentration from vapors of unreacted monomers and polymerization medium which are recycled. Cooling is effected by vaporization of a portion of the mixture of monomers and polymerization medium in a flash tank before supply to the extruder and returning the vaporized fraction and recycle vapors to the flash tank through, in succession, a compressor, heat exchanger and throttle valve. By using the process of the invention, the total energy consumption in butyl rubber manufacture can be cut to about 20% of that of prior art processes.

Manufacture of butyl rubber

This invention concerns the production of 1,4-cis polybutadiene or copolymers of butadiene with other related diolefins through the catalytic polymerization or copolymerization of butadiene monomer by a continuous or discontinuous process carried out in the absence or substantial absence of solvents or diluents, operating in two successive phases (the first at a T&lt;30.degree. C. and the second at a T=or&gt;30.degree. C.) by control of the molecular weights.

Process for the polymerization or copolymerization of butadiene

The present invention relates to the production of 1,4-cis-polybutadiene and of copolymers of butadiene with other conjugated diolefins, by means of the catalytic polymerization or copolymerization of monomer butadiene, by an either continuous or batch process, operating in the presence or in the absence of diluents, and carrying out a portionwise addition, during the polymerization, of a portion of the organometallic compound of aluminum (or of the related hydride derivative), constituiting also one of catalytic components.

The invention relates to the purification of homo- and copolymers of mono- and diolefines, as obtained from a solution polymerization in the presence of uranium catalysts, from the catalyst residues, and particularly to a process for the removal of the uranium from the hydrocarbon solution of the polymer, which solution is mixed with an aqueous solution of ammonium carbonate, the thus resulting aqueous phase being then separately treated for the recovery of the ammonium carbonate and of the uranium.

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San Donato Milanese, Italy

Silvano Gordini