Patent ID: 6803482
Filing Date: 2004-10-12
Classification: C07C

Abstract:
A process for the production of a diisocyanate and/or triisocyanate represented by the general formula (I)R(NCO)nâ€ƒâ€ƒ(I), in whichR represents a (cyclo)aliphatic or aromatic hydrocarbon residue with 2 to 15 carbon atoms, provided that at least 2 carbon atoms are arranged between two NCO groups and n represents 2 or 3, comprising phosgenating a corresponding diamine and/or triamine represented by the general formula (II)R(NH2)nâ€ƒâ€ƒ(II), in the gas phase in a tubular reactor which further comprises(a) a central nozzle which is centered in the tubular reactor by (b) at least two flow homogenizers arranged in (c) an annular space between the central nozzle and (d) a wall of the tubular reactor, (e) a flexible connecting tube which connects the central nozzle with (f) a first inlet for a first educt stream, (g) a second inlet for a second educt stream which is arranged in the annular space in a manner such that(1) the first educt stream is supplied to the tubular reactor via the central nozzle, (2) the second educt stream is supplied to the tubular reactor via the annular space, and (3) velocity of flow in the annular space is homogenized with the flow homogenizers over the entire cross-section of the annular space.