The invention relates to the process for the preparation of iron(lll) chelates of N, N'- di(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid and its derivatives of the formula (I) wherein both R substituents have the same meaning and represent H, C1 -C4 alkyl, CH2OH, SO3M or COOM, and M is a sodium, potassium or ammonium cation, wherein the aqueous solution of a corresponding chelating agent is contacted with metallic iron by the circulation of said aqueous solution through the bed of pieces of metallic iron in a flow reactor while simultaneously blowing air or oxygen through the aqueous solution of the chelating agent in the flow reactor, optionally in the presence of a hydrogen peroxide solution. Chelates of the formula (I) are useful as the components of plant fertilizers.
该发明涉及一种制备
铁(III)螯合物N,N'-二(2-羟基
苯甲基)
乙二胺-N,N'-二
乙酸及其衍
生物的过程,其
化学式为(I),其中两个R取代基具有相同的含义,代表H,C1-C4烷基,CH2OH,SO3M或COOM,M为
钠,
钾或
铵阳离子,其中通过将相应的
螯合剂的
水溶液通过
金属
铁的块状床在流动反应器中循环,同时通过在流动反应器中通过
螯合剂的
水溶液吹送空气或
氧气,可选地在
过氧化氢溶液的存在下,制备出
化学式(I)的螯合物,用作植物肥料的组分。