Process for preparing trifluralin
    1.
    发明授权
    Process for preparing trifluralin 失效
    制备氟乐灵的方法

    公开(公告)号:US5728881A

    公开(公告)日:1998-03-17

    申请号:US810883

    申请日:1997-03-05

    摘要: A process is provided for preparing 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine from 4-chlorotrifluoromethylbenzene. The process includes a two stage nitration and an amination step. Ethylene dichloride is utilized as a diluent and solvent in the nitration steps. Spent acid from the first nitration is reconstituted with sulfur trioxide for use in the second nitration. Spent acid from the second nitration is used directly in the first nitration and evaporation is used to remove nitrosoamines from the final trifluralin product.

    摘要翻译: 提供了从4-氯三氟甲基苯制备2,6-二硝基-N,N-二丙基-4-(三氟甲基)苯胺的方法。 该方法包括两步硝化和胺化步骤。 二氯化乙烯在硝化步骤中用作稀释剂和溶剂。 来自第一次硝化的废酸用三氧化硫重新配制用于第二次硝化。 来自第二硝化的废酸直接用于第一硝化,蒸发用于从最终的氟乐灵产物中除去亚硝基胺。