| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for producing an isocyanate by a reaction of corresponding amines with phosgene in the gas phase in which, once the optimum residence time has been reached, the reaction is effectively stopped within a short time and simple separation of the isocyanate from the remaining components of the reaction mixture can be achieved with the result that an isocyanate mixture having a high isocyanate content can further be obtained and the process can be carried out in a simple, compact apparatus with minimal energy input. SOLUTION: The reaction mixture containing the isocyanate is guided from a reaction chamber through a cooling zone in which a liquid is injected to stop the reaction. In the process, the direct cooling is carried out in the cooling zone in one stage in two or more cooling zones connected in series. COPYRIGHT: (C)2008,JPO&INPIT |
