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:
Jan. 31, 2006
Filed:
Feb. 01, 2001
Pietro Cesti, Trecate-Novara, IT;
Aldo Bosetti, Vercelli, IT;
Franco Mizia, Milan, IT;
Marcella Notari, Parma, IT;
Marco Ricci, Novara, IT;
Franco Rivetti, Milan, IT;
Ugo Romano, Vimercate, IT;
Pietro Cesti, Trecate-Novara, IT;
Aldo Bosetti, Vercelli, IT;
Franco Mizia, Milan, IT;
Marcella Notari, Parma, IT;
Marco Ricci, Novara, IT;
Franco Rivetti, Milan, IT;
Ugo Romano, Vimercate, IT;
Dow Global Technologies Inc., Midland, MI (US);
Abstract
Integrated process for the preparation of aromatic isocyanates comprising: the reaction between an aromatic amine and an organiccarbonate in the presence of a catalyst selected from organic and inorganic salts of a metal selected from Zn, Sn, Pb, Cu; the removal of the catalyst; the passivation of the quantity of residual metal in the urethane formed in step a); the removal of the organic solvent and its optional recycling to step a) of the reaction; the evaporation of the aromatic urethane with partial pyrolysis; the complete pyrolysis of the urethane in gas phase; the recovery of the isocyanate.