PROCESS FOR THE PREPARATION OF N-DI-N-PROPYL-2,6-DINITRO-4-TRIFLUOROMETHYLANILINE WITH LOW CONTENT OF NITROSAMINES

摘要

N-di-n.propyl-2,6-dinitro-4-trifluoromethylaniline (Trifluralin) with a low content in nitrosamines (less than 1 ppm) is prepared by reacting 4-trifluoro-2,6-dinitro-chlorobenzene with di-n.propylamine under the following critical conditions:
- feeding to the chlorobenzoderivative the di-n.propylamine containing a hydrate or an alkaline carbonate so that the pH value be comprised between 7 and 7.5;
- by regulating the temperature in such a way that it will not exceed 70 DEG C;
- by operating in the presence of at least 50% by weight of water in the reaction mass.