Preparation of aromatic polyisocyanates in gaseous phase

Details Preparation of aromatic polyisocyanates in gaseous phase Preparation of aromatic polyisocyanates in gaseous phase

1995-08-14

1997-10-21

Barts, Samuel

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

Organic compounds

Isocyanate esters

C07C26300

Patent

active

056798393

ABSTRACT:
Aromatic polyisocyanates are prepared by reacting at least one compound (A), containing at least two primary amine functions and at least one aromatic nucleus, with a relatively modest quantity of phosgene, in the gaseous phase, the amount of phosgene ranging from the stoichiometric amount to a stoichiometric excess of 100% with respect to the number of moles of amine functions of compound (A), carried out in a mixed reactor which comprises a first, homogenizing zone constituting from 20% to 80% of the total volume thereof, and a second, essentially piston flow downstream zone constituting from 80% to 20% of the total volume thereof.

REFERENCES:
patent: 5391683 (1995-02-01), Joulak et al.
Database WPI, Week 7438, Derwent Publications Ltd., Lond, GB; AN 74-67320V & SU-A-407 567 (Vukhtin et al) Apr. 1974.

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