A method for the purification of dinitroanilines having herbicidal activity by means of the known reactions of denitrosation using acid, and denitration in a neutral or basic environment in the presence of a phase-transfer catalyst, characterised in that:
the denitrosation reaction is effected on the dinitration mixture containing the dinitroaniline of interest and the corresponding unwanted N-nitroso- and N-dinitroaniline impurities, and in the absence of solvent,
the denitration reaction is conducted sequentially to the denitrosation reaction in the same reactor with the addition to the denitrosation product as such of an aqueous base, and of the said phase-transfer catalyst.
一种通过已知的反硝化反应(使用酸)和在中性或碱性环境中的反硝化反应(在相转移催化剂存在下)提纯具有除草活性的
二硝基苯胺的方法,其特征在于:
在没有溶剂的情况下,对含有相关
二硝基苯胺和相应的不需要的 N-亚硝基和 N-
二硝基苯胺杂质的二硝基混合物进行脱硝基反应、
在同一反应器中,向反硝化产物中加入
水基和上述相转移催化剂,依次进行反硝化反应和反硝化反应。