Phosgene Synthesis Catalysis: The Influence of Small Quantities of Bromine in the Chlorine Feedstream.

The effect of relatively low concentrations of Br in the Cl feedstock for phosgene synthesis catalysis via the reaction of CO and Cl over activated carbon (Donau Supersorbon K40) is explored. Under the stated reaction conditions and in the absence of a catalyst, BrCl forms from the reaction of Cl and Br. Phosgene synthesis over the catalyst at 323 K is investigated for Br:Cl molar flow ratios in the range 0-1.