Patent ID: 6586645
Filing Date: 2003-07-01
Classification: C07C

Abstract:
A process for the continuous preparation of nitrochlorobenzene comprising reacting chlorobenzene with sulfuric acid, nitric acid, and water, wherein(a) the feedstocks chlorobenzene, sulfuric acid, nitric acid, and water are introduced simultaneously or successively into a reactor equipped with mixing elements and are mixed at an average mixing power density of 1.5 to 40 watt/liter and at a reaction mixture temperature during initial mixing of 10 to 50Â° C., (b) the content of sulfuric acid in the reaction mixture during mixing, based on the sum of sulfuric acid, nitric acid, and water, is 70 to 80% by weight, (c) the reaction proceeds under adiabatic conditions, (d) at the reactor outlet, the crude nitrochlorobenzene is separated from the waste sulfuric acid, and (e) the waste sulfuric acid is reconcentrated to the original content of sulfuric acid and recycled into the nitration reaction.