Synthesis and in-Situ Conversion of Phosgene in a Microchannel Reactor
1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; 2. Institute of Chemical Engineering, Jiaxing University, Jiaxing 314001, China
Abstract Phosgene is an important but high toxic chemical intermediate, and its safe preparation is of scientific and industrial importance. In a microchannel reactor, synthesis of phosgene was first conducted using anhydrous iron(III) chloride as catalyst and carbon tetrachloride and hydrogen peroxide as reactants, and then its in-situ conversion was achieved by reacting phosgene with ammonia water.The factors affecting the yield of phosgene such as reaction temperature, concentration of H2O2, concentration of catalyst and feeding rate were investigated. The phosgene yield reaches 93% under the optimum experimental condition. The results show the feasibility of the on-site synthesis and in-situ conversion of phosgene in a microchannel reactor, which could be an efficient method to eliminate the potential risks in production, storage, transport and utilization of phosgene. This method would be also applicable for organic compounds phosgenation reaction in a microchannel reactor.
