A process for preparing dinitrotoluene

Details A process for preparing dinitrotoluene A process for preparing dinitrotoluene

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2097071

Described herein is a continuous one pot process for the production of dinitrotoluene by: a) reacting toluene with concen- trated nitric acid to produce a product mixture containing dinitrotoluene, unreacted nitric acid and water; b) then mixing the pro- duct mixture from step (a) with a substantially dehydrated molten nitrate salt; c) then adding additional nitric acid to the mixture of step (b); d) then separating nitric acid from the mixture from step c) in the form of a vapor to form a two phase liquid mixture; e) then separating the dinitrotoluene phase from the liquid hydrated salt phase; f) then treating the acid vapor from step d) and the hydrated salt-liquid phase of step (e) to separate and concentrate nitric acid for recycle to step (a); g) dehydrating the nitrate salt solution; and h) recycling the dehydrated nitrate salt to step (b).

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