Integrated process for the preparation of aromatic...

Details Integrated process for the preparation of aromatic... Integrated process for the preparation of aromatic...

2006-01-31

2006-01-31

Bernhardt, Emily (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

Reexamination Certificate

active

06992214

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.

REFERENCES:
patent: 4290970 (1981-09-01), Merger et al.
patent: 0 323514 (1999-07-01), None
patent: 98 56758 (1998-12-01), None
patent: 99 047493 (1999-09-01), None

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