申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0003374A1
公开(公告)日:1979-08-08
A process for the preparation of 2-chloro-4-ethylamino-6-isopropylamino-s-triazine ("atrazine" herbicide) in which cyanuric chloride is reacted in a first amination step with either isopropylamine or ethylamine to give either 2,6-dichloro-4-isopropyl-amino-s-triazine or 2,6-dichloro-4-ethylamino-s-triazine respectively, which is subsequently reacted in a second amination step with either ethylamine or isopropylamine respectively, both reactions being performed in a mixed acetone/water solvent and in the presence of an acid binding agent, characterised in that in the first amination step the molar ratio of cyanuric chloride to alkylamine is at least 1.04:1, and that subsequent to the first amination step but prior to the second amination step. the cyanuric chloride remaining in the reaction mixture is hydrolysed, using a sufficient quantity of a base to maintain the pH of the reaction mixture in the range of 6 to 11, to a water-soluble salt of monohydroxydichlorotriazine.
一种制备 2-氯-4-乙氨基-6-异丙氨基-s-三嗪("莠去津 "除草剂)的工艺,其中三聚氯氰在第一个胺化步骤中与异丙胺或乙胺反应,分别得到 2,6-二氯-4-异丙氨基-s-三嗪或 2,6-二氯-4-乙氨基-s-三嗪、随后在第二步中分别与乙胺或异丙胺进行胺化反应,两个反应均在丙酮/水混合溶剂中并在酸结合剂存在下进行,其特征在于,在第一胺化步骤中,三聚氯氰与烷基胺的摩尔比至少为 1.在第一胺化步骤之后但在第二胺化步骤之前,使用足量的碱将反应混合物中残留的三聚氯氰水解,使反应混合物的 pH 值保持在 6 至 11 的范围内,生成一羟基二氯三嗪的水溶性盐。