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US 2003/0069441 A1Published application
Process for preparing (cyclo)aliphatic isocyanates
AssigneeBayer Aktiengesellschaft
InventorsHans-Joachim Leimkuhler, Herbert Stutz, Helmut Schmidt
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Abstract
The present invention relates to a novel process for preparing (cyclo)aliphatic diisocyanates and triisocyanates by phosgenation of (cyclo)aliphatic diamines and triamines in the gas phase by accelerating the flow of at least one of reactants in the region where the reactants are mixed.
Claims3
A process for preparing a (cyclo)aliphatic diisocyanate or triisocyanate corresponding to the formula
- R—(NCO)n (1),
- wherein
- R represents a (cyclo)aliphatic hydrocarbon group having up to 15 carbon atoms, provided that there are at least two carbon atoms between two nitrogens,
- n represents the number 2 or 3, by
- a) separately heating phosgene and a diamine or triamine corresponding to the formula
- R—(NH2)n (II),
- to a temperature of 200° C. to 600° C., wherein the amine may optionally be diluted with an inert gas or with the vapors of an inert solvent,
- b) accelerating the flow of at least one of reactants in the region where the reactants are mixed and
- c) continuously reacting the reactants in a reaction chamber that does not have moving parts.
6 more elements
Dependencies are inferred from the claim text.