Process for purifying crude trifluralin

Details Process for purifying crude trifluralin Process for purifying crude trifluralin

C - Chemistry, Metallurgy

07

C

260/612.3

C07C 201/16 (2006.01) C07C 209/84 (2006.01) C07C 211/52 (2006.01)

Patent

CA 1261355

AN IMPROVED PROCESS FOR PURIFYING CRUDE TRIFLURALIN ABSTRACT OF THE DISCLOSURE The level of the nitrosamines which may be present in the unrefined trifluralin is reduced to a value below 0.5 ppm, by treating the unrefined trifluralin under agitation, at a tempera- ture from 60 to 90°C, for a time between 10 minutes and 4 hours, with an aqueous solution containing from 15 to 50% by weight of hydrobromic acid in a ratio of 0.2 to 0.8 liters per kilogram of unrefined trifluralin, said aqueous solution of hydrobromic acid being added with an amount of sulphamic acid from 0.1 to 3 g per liter of solution and with an amount of bisulphite of an alkaline metal corresponding to a content of sulphur dioxide from 0.3 to 1.2 g per liter of said hydrobromic acid aqueous solution. The so obtained refined trifluralin has a content of nitrosamines which is lower than 0.1 ppm.

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