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公开(公告)号:US06992214B2
公开(公告)日:2006-01-31
申请号:US10220593
申请日:2001-02-01
申请人: Pietro Cesti , Aldo Bosetti , Franco Mizia , Marcella Notari , Marco Ricci , Franco Rivetti , Ugo Romano
发明人: Pietro Cesti , Aldo Bosetti , Franco Mizia , Marcella Notari , Marco Ricci , Franco Rivetti , Ugo Romano
IPC分类号: C07C263/04
CPC分类号: C07C263/04 , Y02P20/125 , C07C265/12
摘要: 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.