The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 2020
Filed:
Aug. 11, 2016
Versalis S.p.a., San Donato Milanese (MI), IT;
Eve Rubber Institute Co., Ltd., Qingdao, CN;
Gabriele Gatti, San Donato Milanese, IT;
Jiye Wang, Qingdao, CN;
Claudio Cavallo, San Donato Milanese, IT;
Jianjun Song, Qingdao, CN;
VERSALIS S.P.A., San Donato Milanese (MI), IT;
EVE RUBBER INSTITUTE CO., LTD., Qingdao, CN;
Abstract
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the head of said liquid-liquid separation column () to an azeotropic distillation column (); (d) feeding the stream withdrawn laterally (side-withdrawal) from said azeotropic distillation column () to an adsorption section (); Said process allows to obtain a polymer grade solvent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.