FIELD: chemistry.
SUBSTANCE: invention relates to the improved method for the manufacture of phosphonoalkyliminodiacetic acid M2PO3-X-N-(CH2COOM)2, 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
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