| 摘要 |
A method for the manufacture of amino alkylcnc phosphonic acids is disclosed. Pure P 4 O 6 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 P 4 O 6 hydrolysis has been completed, from 0 to 40 %. The required amine component can be added before, during, or in one preferred execution, after the P 4 O 6 hydrolysis has been completed. Formaldehyde is then added and the reaction mixture containing the P 4 O 6 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.
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