Method for removing nitrosation agent(s) from nitrated...

Details Method for removing nitrosation agent(s) from nitrated... Method for removing nitrosation agent(s) from nitrated...

C - Chemistry, Metallurgy

07

B

260/557.4, 260/6

C07B 43/02 (2006.01) C07C 201/16 (2006.01)

Patent

CA 1144943

Abstract of the Disclosure Nitrosation agent(s), contained as by-products in ni- trated aromatic compounds after nitration with nitric acid or nitration acid, are removed by a water treatment. wherein the water is distilled off at least partially in vapor form, advantageously under reduced pressure. In the further reaction of the nitrocompounds treated in this manner undesired nitrosamines are practically not formed. The process is especially suitable for the manufacture of 4-di-n-propylamino-3,5-dinitrobenzotrifluoride (Trifluralin) a valuable herbicide substantially, free from nitrosamlne(s).

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