A method for the manufacture of amino alkylcnc phosphonic acids is disclosed. Pure P4O6 is hydrolyzed in the presence of a homogeneous Brocnstcd acid catalyst whereby the pH of the reaction medium is maintained below 5 and the free water content of said reaction medium is, after the P4O6 hydrolysis has been completed, from 0 to 40 %. The required amine component can be added before, during, or in one preferred execution, after the P4O6 hydrolysis has been completed. Formaldehyde is then added and the reaction mixture containing the P4O6 hydrolysate, the amine and the formaldehyde is reacted in presence of a Broensted acid catalyst selected from homogeneous and heterogeneous species. The amino alkylene phosphonic acid reaction product can then be recovered in a manner known per sé.
揭示了一种制备
氨基烷基
磷酸的方法。在均相Brønsted酸催化剂的存在下,纯P4O6在
水解过程中,使反应介质的pH保持在5以下,并且在P4O6
水解完成后,所述反应介质的游离
水含量为0至40%。所需的胺组分可以在P4O6
水解之前、期间或在一种首选的执行方式中,即在P4O6
水解完成后添加。然后加入
甲醛,并在选择自均相和非均相物种的Brønsted酸催化剂的存在下,使含有P4O6
水解物、胺和
甲醛的反应混合物发生反应。然后可以以已知的方式回收
氨基烷基
磷酸反应产物。