Process for the production of dinitrotoluene

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

1995-08-03

1997-11-18

Cintins, Marianne M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568927, 568932, C07C20500

Patent

active

056890184

ABSTRACT:
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.

REFERENCES:
patent: 3928475 (1975-12-01), Dassel
patent: 4021498 (1977-05-01), Alexanderson et al.
patent: 4091042 (1978-05-01), Alexanderson et al.
patent: 4367347 (1983-01-01), Sawicki et al.
patent: 4453027 (1984-06-01), Vaidyanathan
patent: 4663490 (1987-05-01), Gerken et al.
patent: 5345012 (1994-09-01), Schieb et al.

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