Process for the production of dinitrotoluene

Details Process for the production of dinitrotoluene Process for the production of dinitrotoluene

C - Chemistry, Metallurgy

07

C

C07C 205/06 (2006.01) C07C 201/08 (2006.01)

Patent

CA 2155562

Dinitrotoluene is produced from toluene and nitric acid in the presence of sulfuric acid in a two stage process. In the first stage, toluene and nitric acid are reacted under isothermal conditions in amounts such that mononitrotoluene is produced. The reaction mixture is then separated into an organic phase and an acid phase. The organic phase is then further reacted with nitric acid under adiabatic conditions to produce dinitrotoluene. The reaction mixture is then separated into an organic phase and an acid phase. Dinitrotoluene is recovered from the organic phase. After at least 5% by weight water is removed from the acid phase and sufficient nitric acid to replace that consumed during the nitration reaction has been added, the acid phase may be recycled.

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