The mixture of Mononitrochlorobenzene isomers, obtained from Chlorobenzene and Nitric Acid in the presence of Sulphuric Acid by the adiabatic process, or from Chlorobenzene and the corresponding mixed acid by the conventional nitration process, serves for obtaining the separate isomers. These are mainly used as raw materials in the dyeing chemistry and the agricultural chemistry.

Adiabatic nitration MNCB plants by MEISSNER are characterized by the application of tube reactors, which minimize the formation of by-products by optimum reactant intermixing and negligible back mixing inside the tube reactor. Due to the adiabatic technology, the reconcentration of the Sulphuric Acid accruing after separation of the MNCB takes place directly in the plant.

The crude Mononitrochlorobenzene is automatically fed to the washing section consisting of MEISSNER compact washers, which perform the product washing as well as the separation of the product from the respective washing medium. In the subsequent stripping unit the Chlorobenzene contained in the purified MNCB is separated by means of steam and returned into the process.


MNCB plants by MEISSNER using the conventional nitration process are characterized by the application of circulation reactors which have been developed especially for nitration purposes, and which ensure a high degree of security due to their large cooling areas with a small reactor volume. The circulation pumps used in the reactors provide for an optimum conversion of the reactants and thus an MNCB of uniformly high quality.

For safety reasons, the separation of the MNCB isomer mixture from the spent acid is performed in dynamic separators featuring a short separation time (within the range of seconds) and a very small volume. The mixture of MNCB isomers is automatically fed to the washing section consisting of MEISSNER compact washers, which perform the product washing as well as the separation of the product from the washing medium.


Additionally to the MNCB plant, MEISSNER as main contractor also offers the spent acid regeneration plant for the recovery of concentrated Sulphuric Acid and Nitric Acid.