Patent ID: 8802890
Filing Date: 2014-08-12
Classification: C07C

Abstract:
1. A process for manufacturing isocyanates from an amine compound, the process comprising the steps of a) providing chlorine, wherein the chlorine comprises bromine in the range of 50 to 500 ppm in molecular or bound form; b) providing carbon monoxide; c) reacting said chlorine and said carbon monoxide for providing phosgene, the carbon monoxide being provided in an adjustable molar excess, wherein the mol ratio of carbon monoxide over chlorine is in a range of above 1.000:1.000 up to or equal to 1.025:1.000; d) providing an amine compound and phosgenating said amine compound using said phosgene thereby providing said isocyanate; and wherein the process further comprises adjusting said adjustable molar excess for adjusting the colour of the isocyanate.