Patent ID: 6794549
Filing Date: 2004-09-21
Classification: C07C

Abstract:
Process for the continuous preparation of nitrochlorobenzene by a nitration reaction comprising reacting chlorobenzene with sulphuric acid, phosphoric acid, nitric acid and water, characterized in thata) feedstock chlorobenzene, sulphuric acid, phosphoric acid and water are introduced simultaneously or successively in any order into a reactor equipped with mixing elements and are mixed such that the temperature of the reaction mixture during initial mixing is from 10 to 80Â° C., b) the content phosphoric acid, based on pure H3PO4, in the resulting reaction mixture during mixing, based on the sum of sulphuric acid, phosphoric acid, nitric acid and water, is from 10 to 50% by weight, c) the reaction proceeds under adiabatic conditions, d) at the reactor outlet, crude nitrochlorobenzene is separated from the waste acid, e) waste acid is reconcentrated in a one-step process and recycled into the nitration reaction.