Patent ID: 9051243
Filing Date: 2015-06-09
Classification: C07C

Abstract:
1. A process for the production of an isocyanate comprising reacting a primary amine with phosgene in a reactor in the gas phase the process comprising the following steps: (a) vaporizing the amine in a vaporizer, the vaporized amine containing droplets, (b) superheating the vaporized amine in a feed to the reactor to a temperature at least 15° C. above dew point in the feed directly before entry into the reactor, wherein either (i) no device for drop separation is included in the feed to the reactor, or (ii) a drop separator which has a drop diameter limit of from 5 to 550 micron is arranged in the feed to the reactor, (c) allowing the vaporized amine to remain in the feed to the reactor for a dwell time of more than 0.08 seconds, (d) maintaining a pressure difference between exit of the vaporizer and entry into the reactor of from 1 to 500 mbar, and (e) introducing the superheated amine into the reactor via the feed.