Versalis S.p.a.

Eve Rubber Institute Co., Ltd.

Gabriele Gatti

Claudio Cavallo

Jianjun Song

Jiye Wang

Process for the purification of the solvent deriving from the production of an elastomeric blend comprising the following steps: (a) optionally, subjecting said solvent to a pre-washing () in the presence of at least one acid or basic aqueous solution; (b) feeding said solvent to a liquid-liquid separation column (); (c) feeding the stream leaving the head of said liquid-liquid separation column () to an azeotropic distillation column (); (d) feeding the stream withdrawn laterally (side-withdrawal) from said azeotropic distillation column () to an adsorption section (); Said process allows to obtain a polymer grade solvent having a quality suitable for being used indifferently and contemporaneously in various types of production plants of elastomeric (co)polymers, i.e. in plants wherein an anionic (co)polymerization is carried out, and also in plants wherein a Ziegler-Natta (co)polymerization is carried out.

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San Donato Milanese, Italy

Gabriele Gatti