Patent ID: 8563768
Filing Date: 2013-10-22
Classification: C01B,C07C

Abstract:
1. A process for the production of an isocyanate comprising: a) reacting an amine with a stoichiometric excess of phosgene in a gas phase in a reactor at a temperature above the amine's boiling point to obtain a liquid stream containing the isocyanate and a gas stream containing hydrogen chloride and phosgene, b) separating the gas stream containing hydrogen chloride and phosgene produced in step a) into a gas stream containing hydrogen chloride and a liquid stream containing phosgene, c) converting at least part of the liquid stream containing phosgene produced in step b) to a gas stream containing phosgene, d) recycling the gas stream containing phosgene produced in step c) into step a), and e) maintaining the gas stream containing phosgene from step d) at a pressure higher than that of the liquid stream containing phosgene produced in step b).