申请人:AMINKEMI AB
公开号:EP0617008A1
公开(公告)日:1994-09-28
A method for the preparation of an aqueous solution of iron polyprotic acid chelate complexes, comprising reacting a solution of a mixture of a first polyprotic acid or a salt thereof, said first acid being capable of chelating iron, and a second polyprotic acid or a salt thereof, said second acid being capable of chelating iron and being different from the first acid, with iron in the presence of an oxidizing agent, with the proviso that at least part of the carboxylic acid groups in the first and second acids is present in salt form and at least part of the carboxylic acid groups in the first and second acids is present in acid form. Preferably, the first and second polyprotic acids may be selected from ethylenediaminetetraacetic acid (EDTA), N-hydroxyethyl-ethylenediaminetriacetic acid (HEDTA), and diethylenetriaminepentaacetic acid (DTPA), and the iron is selected from Fe-powder, Fe(OH)₂ and FeCO₃. Part of the polyprotic acid groups in the first and second acids is present in the salt form, the salt being selected from ammonium and alkali metal ions, in particular K⁺, Na⁺ and mixtures thereof. The method makes it possible to obtain aqueous solutions containing high contents of iron, such as up to approximately 7% by weight of iron, for use as a plant nutrient, mainly in soil-free plant culturing.
一种制备铁多羧酸螯合物水溶液的方法,包括在氧化剂存在下,将第一多羧酸或其盐的混合物溶液与铁反应,所述第一酸能够螯合铁,和第二多羧酸或其盐,所述第二酸能够螯合铁且与第一酸不同,反应,其中第一和第二酸中至少部分羧基以盐形式存在,且第一和第二酸中至少部分羧基以酸形式存在。首选,第一和第二多羧酸可选自乙二胺四乙酸(EDTA)、N-羟乙基-乙二胺三乙酸(HEDTA)和二乙烯三胺五乙酸(DTPA),铁可选自Fe-粉末、Fe(OH)₂和FeCO₃。第一和第二酸中的多羧酸基的部分以盐形式存在,所述盐选自铵和碱金属离子,特别是K⁺、Na⁺和它们的混合物。该方法可获得含有高铁含量的水溶液,如高达约7%的铁含量,用作植物营养剂,主要用于无土栽培。