Process for the preparation of aromatic diisocyanates

Details Process for the preparation of aromatic diisocyanates Process for the preparation of aromatic diisocyanates

1993-05-17

1995-09-12

Dees, Jose G.

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

Organic compounds

Isocyanate esters

G07C26310

Patent

active

054498180

ABSTRACT:
A continuous process for the preparation of aromatic diisocyanates by phosgenation of the corresponding diamines, in which the reaction is carried out in the gas phase. The mean contact time for the gaseous reactants is from 0.5 to 5 seconds with a mean deviation of no more than 6%. The product diisocyanate is obtained in yields of over 95%.

REFERENCES:
patent: 4419295 (1983-12-01), Hennig et al.
patent: 4847408 (1989-07-01), Frosch et al.
Chem.-Ing.-Techn. 44 (1972), p. 1051 ff.
Appl. Sci. Res. (The Hauge) A3 (1953) p. 279 ff.

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