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US 5,633,396 AGranted
Process for preparing triisocyanates
AssigneeBayer Aktiengesellschaft
InventorsEric Bischof, J urgen Dahmer, Andreas Flink, Wolfgang Krohn, Attila Molnar
Life of this patent
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Abstract
Triisocyanates are produced by gas phase phosgenation of the corresponding (cyclo)aliphatic triamines having three primary amine groups.
Claims6
A process for producing a triisocyanate represented by the general formula ##STR4## in which R represents a (cyclo)aliphatic hydrocarbon group having from 1 to 22 carbon atoms,
- comprising
- a) phosgenating
- (1) a triamine represented by the general formula ##STR5## which is present in vapor form and has been heated to a temperature of from 200.degree. to 600.degree. C.
- by continuously reacting that triamine with
- (2) phosgene heated to from 200.degree. to 600.degree. C.
- in a cylindrical reaction chamber heated to 200.degree. to 600.degree. C., without any moving parts, while maintaining a rate of flow in the reaction chamber of at least 3 m/s,
- b) cooling the gas mixture continuously leaving the reaction chamber with an inert, liquid solvent which is held at a temperature above the decomposition temperature of carbamic acid chloride corresponding to the triamine to recover a solution of the triisocyanate in the solvent and
- c) recovering the triisocyanate which is dissolved in the inert solvent.
5 more elements
Dependencies are inferred from the claim text.