Process for the manufacture of (poly-)isocyanates in the gas...

Details Process for the manufacture of (poly-)isocyanates in the gas... Process for the manufacture of (poly-)isocyanates in the gas...

2005-12-13

2005-12-13

Gorr, Rachel (Department: 1711)

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

Organic compounds

Isocyanate esters

C560S336000

Reexamination Certificate

active

06974880

ABSTRACT:
The present invention relates to a process for the manufacture of diisocyanates by phosgenation of the corresponding diamines in which the vaporous diamines, optionally rarefied with an inert gas or with the vapors of an inert solvent, and phosgene are heated separately to temperatures of about 200° C. to about 600° C. and mixed and reacted in a tube reactor characterized in that a number n≧2 of nozzles directed parallel to the axis of the tube reactor are arranged in the tube reactor, the diamine-containing stream being fed into the tube reactor through the n nozzles and the phosgene stream being fed into the tube reactor through the remaining free space.

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patent: 5449818 (1995-09-01), Biskup et al.
patent: 5516935 (1996-05-01), Bischof et al.
patent: 5679839 (1997-10-01), Armand et al.
patent: 5931579 (1999-08-01), Gallus et al.
patent: 300 168 (1992-05-01), None
patent: 2 036 586 (1979-11-01), None

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