| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to the improved method for the manufacture of phosphonoalkyliminodiacetic acid MPO-X-N-(CHCOOM), wherein X is methylene, M - hydrogen atom, which can be used commercially in chemical industry. The method comprises as follows: the iminodiacetic acid reacts with phosphorous acid and formaldehyde in the presence of phosphoric acid, whereby the molar ratio of phosphorous acid: iminodiacetic acid 1:1, phosphoric acid:phosphorous acid 5:1, formaldehyde:iminodiacetic acid from 1.1:1 to 1:1, at 124-140°C for a period of from 1 minute to 10 hours, to thereby yield a substantially reaction medium insoluble product, separating the insoluble reaction product from the reaction medium, and water washing the insoluble reaction product.EFFECT: improved method.9 cl, 3 ex |
