METHOD OF PRODUCING AMINOPOLYALKYLENEPHOSPHONIC ACID COMPOUNDS IN PRESENCE OF HETEROGENEOUS CATALYST Russian patent published in 2010 - IPC C07F9/38 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing aminoalkylenephosphonic acid which can be used in water purification, inhibiting scum formation, in detergent additives, sequestering agents, activating additives during oil extraction and as pharmaceutical components. The proposed method of producing aminoalkylenephosphonic acid is realised in the presence of not more than 0.4 wt % hydrohalogenic acid, where all available N-H groups in 50% or more of the amine starting material are converted to the corresponding alkylenephosphonic acid. The proposed method involves reacting (a) phosphorous acid, (b) amine and (c) formaldehyde, where the ratio (a): (b) ranges from 0.05:1 to 2:1, (c):(b) ranges from 0.05:1 to 5:1, and (c):(a) ranges from 5:1 to 0.25:1; where (a) and (c) denote number of moles and (b) number of moles multiplied by the number of N-H groups in the amine, in the presence of a Bronsted acid catalyst which is heterogeneous with respect to the reaction medium, with subsequent extraction of the obtained aminoalkylenephosphonic acid.

EFFECT: design of a method of producing aminoalkylenephosphonic acid, which has economical, technological and ecological advantages.

19 cl, 8 ex