METHOD OF PRODUCING 2-NITRODIPHENYLAMINE Russian patent published in 2012 - IPC C07C209/10 C07C211/55 C07C211/56 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of producing 2-nitrodiphenylamine. The method involves boiling, while continuously stirring, 2-nitroaniline, bromobenzene, anhydrous carbonate of an alkali metal and a copper (I) iodide catalyst. 2-nitroaniline and bromobenzene are taken in molar ratio 1:1.5. A surfactant and sodium carbonate are added. The mixture is boiled at 170-185°C for 20 hours while continuously distilling off the azeotrope of water with bromobenzene and periodically adding pure bromobenzene to the reaction mass in order to maintain temperature. The remaining bromobenzene is distilled off at temperature 170°C. Water is added and heated until boiling and the remaining bromobenzene is distilled off with water vapour, treated at temperature 90°C first with 22% hydrochloric acid solution and then with 5% solution of an alkaline agent and recrystallised from alcohol.

EFFECT: method increases output of 2-nitrodiphenylamine and simplifies the process by using bromobenzene as both the solvent and reactant, and excess bromobenzene is reused without reprocessing.

4 cl, 2 ex