Continuous preparation of organic isocyanates

Details Continuous preparation of organic isocyanates Continuous preparation of organic isocyanates

1982-04-02

1983-12-27

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C11802

Patent

active

044229763

ABSTRACT:
A two-stage continuous preparation process for organic isocyanates uses a primary amine which is reacted with stoichiometrically excess phosgene at a gauge pressure of 10 Kg/cm.sup.2 or lower and a temperature of 60.degree.-100.degree. C. in an inert organic solvent. Then, the resultant reaction mixture is maintained at a gauge pressure of 10 Kg/cm.sup.2 or lower and a temperature of 120.degree.-160.degree. C. until the reaction is completed.

REFERENCES:
patent: 2822373 (1958-02-01), Beck
patent: 3184494 (1965-05-01), Maeda et al.
patent: 3234253 (1966-02-01), Cooper
patent: 3544611 (1970-12-01), Michelet et al.

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