Process for the continuous preparation of organic mono-and/or po

Details Process for the continuous preparation of organic mono-and/or po Process for the continuous preparation of organic mono-and/or po

1985-01-25

1986-04-08

Torrence, Dolph H.

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

Organic compounds

Isocyanate esters

C07C11802

Patent

active

045811741

ABSTRACT:
The invention relates to a process for the continuous preparation of organic isocyanates, preferably polyisocyanates, through the reaction of organic amines, preferably polyamines, with phosgene in the presence of organic solvents under pressure, for example from 5 to 100 bar, at elevated temperatures, for example from 100 to 220.degree. C., whereby the reaction mixture is partially recycled, preferably using natural circulation, and the hydrogen chloride content in the reaction mixture prior to the addition of the amine is less than 0.5 percent by weight based on the total weight of the reaction mixture and the molar ratio of phosgene to NH.sub.2 group in the organic amines is from 12:1 to 200:1.

REFERENCES:
patent: 4128569 (1978-12-01), Horn et al.

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