Process for the production of 2,4-dinitroanilines
AssigneeSandoz Ltd.
InventorIstvan Toth
Life of this patent
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Abstract
A method for the preparation of 2,4-dinitroaniline from 1-chloro-2,4-dinitrobenzene comprising adding ammonia to melted 1-chloro-2,4-dinitrobenzene in such dosages that the temperature of the mixture does not exceed 120.degree. C. and that the pressure does not exceed 3 bar. 6-halo-2,4-dinitroaniline may be produced from the so formed 2,4-dinitroaniline by neutralizing the suspension containing the 2,4-dinitroaniline with acid to give a pH of from the 6-halo-2,4-dinitroaniline. The 6-halo 2,4-dinitroaniline is useful in the preparation of dyestuffs.
Claims12
In a process for the production of 2,4-dinitroaniline by reacting 1-chloro-2,4-dinitrobenzene with ammonia, the improvement which comprises adding the ammonia to melted 1-chloro-2,4-dinitrobenzene in such dosages that the temperature of the reaction mixture does not exceed 120.degree. C. and the pressure does not exceed 2 bar.
Dependencies are inferred from the claim text.