Patent ID: 9006481
Filing Date: 2015-04-14
Classification: B01J,C07B,C07C,F28D

Abstract:
1. A process for preparing isocyanates, comprising: evaporating phosgene and an amine; then superheating the evaporated phosgene and the evaporated amine to a reaction temperature; mixing the superheated phosgene and the superheated amine and then feeding the resulting superheated mixture to a reactor; and reacting the phosgene and the amine in the gas phase, optionally in the presence of an inert medium, to obtain an isocyanate, wherein (a) a residence time of the phosgene at temperatures greater than 300° C. is not more than 5 s, (b) a temperature of heat transfer surfaces in contact with the phosgene is not more than 20 K above the phosgene temperature to be established, or a combination thereof.