Devices for the purification of nitration products

The method comprises contacting nitrated crude products with a washing medium to produce an emulsion by a mixing unit, and subsequently feeding the produced emulsion in a tubular reactor so that, during a passage of the emulsion, impurities obtained in nitrated crude products are removed through the tubular reactor and are transferred into the washing medium. The mixing unit comprises agitated vessels, a jet mixer or a centrifugal pump. The jet mixer generates a central propulsion jet, and a medium in the form of an annular beam surrounding the propulsion jet. The method comprises contacting nitrated crude products with a washing medium to produce an emulsion by a mixing unit, and subsequently feeding the produced emulsion in a tubular reactor so that, during a passage of the emulsion, impurities obtained in nitrated crude products are removed through the tubular reactor and are transferred into the washing medium. The mixing unit comprises agitated vessels, a jet mixer or a centrifugal pump. The jet mixer generates a central propulsion jet, and a medium in the form of an annular beam surrounding the propulsion jet. A ratio of speed between the central propulsion jet and the medium is 1:1-10:1. The mixing unit is integrated into the tubular reactor, and is a component of the tubular reactor. The tubular reactor is equipped with mixing elements for entering a mixing energy. The mixing elements are formed as static mixer or flow divider. The mixing energy of the mixing elements is 20-200 J/l and/or a pressure drop of per mixing element is 0.3-0.8 bar. A delay time in the tubular reactor is 1-30 seconds. A mass ratio between the nitrated crude products and the washing medium is 10:1-1:2, and/or a phase ratio between the nitrated crude products and the washing medium is 5:1-1:1. The washing medium is present in water state under process conditions at a temperature of 25[deg] C and an atmospheric pressure. A base having a concentration of 0.02-0.2 mol/l is added to the washing medium. The nitrated crude products: are present in liquid state under process conditions at the temperature of 25[deg] C and the atmospheric pressure; derived from a nitration of benzene, toluene and xylene, and/or optionally halogenated with mono-, di- and tri-nitroaromatics. The step of feeding the resulting emulsion in the tubular reactor comprises connecting a separation of the nitrated products liberated by the impurities of the washing medium in a sheath device. A mixture withdrawi