Mononitrotoluene (MNT)

In industrial chemistry, Mononitrotoluene is mainly used in as a pre-product for polyurethanes, via the route Dinitrotoluene / TDA / TDI. Mononitrotoluene is obtained as a mixture of isomers by nitration of Toluene in MNT mixed acid. Besides of MNT, the obtained pure isomers, after isomer separation, serve as an important raw material for the dyeing industry and other related industries. Meissner MNT plants are characterized by their circulation reactors which have been developed especially for nitration purposes, and which ensure a high degree of security due to their large cooling areas for a small reactor volume. The circulation pumps used in the reactors accomplish an optimum conversion of the reactants, in this way providing a constantly high quality of MNT. For safety reasons, the separation of the mixture of MNT isomers from the spent acid is performed in dynamic separators, which are characterized by a short separation time (within the range of seconds) and a very small volume. The MNT isomer mixture is automatically conveyed to the washing section consisting of compact Meissner washing apparatuses performing the washing as well as the separation of the product from the washing medium. Additionally to the MNT plant, Meissner as main contractor also offers the spent acid regeneration plant performing the recovery of concentrated Sulfuric Acid and Nitric Acid, as well as the respective plant for MNT isomer separation and an economical waste water purification plant for the removal of toxic nitrocresols, contained in the MNT waste water, in order to obtain a biologically degradable waste water.